/* GLIB - Library of useful routines for C programming * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * gmain.c: Main loop abstraction, timeouts, and idle functions * Copyright 1998 Owen Taylor * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GLib Team and others 1997-2000. See the AUTHORS * file for a list of people on the GLib Team. See the ChangeLog * files for a list of changes. These files are distributed with * GLib at ftp://ftp.gtk.org/pub/gtk/. */ /* * MT safe */ #include "config.h" /* uncomment the next line to get poll() debugging info */ /* #define G_MAIN_POLL_DEBUG */ #include "glib.h" #include "gthreadinit.h" #include #include #include #ifdef HAVE_SYS_TIME_H #include #endif /* HAVE_SYS_TIME_H */ #ifdef GLIB_HAVE_SYS_POLL_H # include # undef events /* AIX 4.1.5 & 4.3.2 define this for SVR3,4 compatibility */ # undef revents /* AIX 4.1.5 & 4.3.2 define this for SVR3,4 compatibility */ /* The poll() emulation on OS/X doesn't handle fds=NULL, nfds=0, * so we prefer our own poll emulation. */ #ifdef _POLL_EMUL_H_ #undef HAVE_POLL #endif #endif /* GLIB_HAVE_SYS_POLL_H */ #ifdef HAVE_UNISTD_H #include #endif /* HAVE_UNISTD_H */ #include #ifdef G_OS_WIN32 #define STRICT #include #endif /* G_OS_WIN32 */ #ifdef G_OS_BEOS #include #include #endif /* G_OS_BEOS */ #ifdef G_OS_UNIX #include #include #endif #include "galias.h" /* Types */ typedef struct _GTimeoutSource GTimeoutSource; typedef struct _GChildWatchSource GChildWatchSource; typedef struct _GPollRec GPollRec; typedef struct _GSourceCallback GSourceCallback; typedef enum { G_SOURCE_READY = 1 << G_HOOK_FLAG_USER_SHIFT, G_SOURCE_CAN_RECURSE = 1 << (G_HOOK_FLAG_USER_SHIFT + 1) } GSourceFlags; #ifdef G_THREADS_ENABLED typedef struct _GMainWaiter GMainWaiter; struct _GMainWaiter { GCond *cond; GMutex *mutex; }; #endif struct _GMainContext { #ifdef G_THREADS_ENABLED /* The following lock is used for both the list of sources * and the list of poll records */ GStaticMutex mutex; GCond *cond; GThread *owner; guint owner_count; GSList *waiters; #endif gint ref_count; GPtrArray *pending_dispatches; gint timeout; /* Timeout for current iteration */ guint next_id; GSource *source_list; gint in_check_or_prepare; GPollRec *poll_records; guint n_poll_records; GPollFD *cached_poll_array; guint cached_poll_array_size; #ifdef G_THREADS_ENABLED #ifndef G_OS_WIN32 /* this pipe is used to wake up the main loop when a source is added. */ gint wake_up_pipe[2]; #else /* G_OS_WIN32 */ HANDLE wake_up_semaphore; #endif /* G_OS_WIN32 */ GPollFD wake_up_rec; gboolean poll_waiting; /* Flag indicating whether the set of fd's changed during a poll */ gboolean poll_changed; #endif /* G_THREADS_ENABLED */ GPollFunc poll_func; GTimeVal current_time; gboolean time_is_current; }; struct _GSourceCallback { guint ref_count; GSourceFunc func; gpointer data; GDestroyNotify notify; }; struct _GMainLoop { GMainContext *context; gboolean is_running; gint ref_count; }; struct _GTimeoutSource { GSource source; GTimeVal expiration; guint interval; }; struct _GChildWatchSource { GSource source; GPid pid; gint child_status; #ifdef G_OS_WIN32 GPollFD poll; #else /* G_OS_WIN32 */ gint count; gboolean child_exited; #endif /* G_OS_WIN32 */ }; struct _GPollRec { GPollFD *fd; GPollRec *next; gint priority; }; #ifdef G_THREADS_ENABLED #define LOCK_CONTEXT(context) g_static_mutex_lock (&context->mutex) #define UNLOCK_CONTEXT(context) g_static_mutex_unlock (&context->mutex) #define G_THREAD_SELF g_thread_self () #else #define LOCK_CONTEXT(context) (void)0 #define UNLOCK_CONTEXT(context) (void)0 #define G_THREAD_SELF NULL #endif #define SOURCE_DESTROYED(source) (((source)->flags & G_HOOK_FLAG_ACTIVE) == 0) #define SOURCE_BLOCKED(source) (((source)->flags & G_HOOK_FLAG_IN_CALL) != 0 && \ ((source)->flags & G_SOURCE_CAN_RECURSE) == 0) #define SOURCE_UNREF(source, context) \ G_STMT_START { \ if ((source)->ref_count > 1) \ (source)->ref_count--; \ else \ g_source_unref_internal ((source), (context), TRUE); \ } G_STMT_END /* Forward declarations */ static void g_source_unref_internal (GSource *source, GMainContext *context, gboolean have_lock); static void g_source_destroy_internal (GSource *source, GMainContext *context, gboolean have_lock); static void g_main_context_poll (GMainContext *context, gint timeout, gint priority, GPollFD *fds, gint n_fds); static void g_main_context_add_poll_unlocked (GMainContext *context, gint priority, GPollFD *fd); static void g_main_context_remove_poll_unlocked (GMainContext *context, GPollFD *fd); static void g_main_context_wakeup_unlocked (GMainContext *context); static gboolean g_timeout_prepare (GSource *source, gint *timeout); static gboolean g_timeout_check (GSource *source); static gboolean g_timeout_dispatch (GSource *source, GSourceFunc callback, gpointer user_data); static gboolean g_child_watch_prepare (GSource *source, gint *timeout); static gboolean g_child_watch_check (GSource *source); static gboolean g_child_watch_dispatch (GSource *source, GSourceFunc callback, gpointer user_data); static gboolean g_idle_prepare (GSource *source, gint *timeout); static gboolean g_idle_check (GSource *source); static gboolean g_idle_dispatch (GSource *source, GSourceFunc callback, gpointer user_data); G_LOCK_DEFINE_STATIC (main_loop); static GMainContext *default_main_context; static GSList *main_contexts_without_pipe = NULL; #ifndef G_OS_WIN32 /* Child status monitoring code */ enum { CHILD_WATCH_UNINITIALIZED, CHILD_WATCH_INITIALIZED_SINGLE, CHILD_WATCH_INITIALIZED_THREADED }; static gint child_watch_init_state = CHILD_WATCH_UNINITIALIZED; static gint child_watch_count = 1; static gint child_watch_wake_up_pipe[2] = {0, 0}; #endif /* !G_OS_WIN32 */ G_LOCK_DEFINE_STATIC (main_context_list); static GSList *main_context_list = NULL; GSourceFuncs g_timeout_funcs = { g_timeout_prepare, g_timeout_check, g_timeout_dispatch, NULL }; GSourceFuncs g_child_watch_funcs = { g_child_watch_prepare, g_child_watch_check, g_child_watch_dispatch, NULL }; GSourceFuncs g_idle_funcs = { g_idle_prepare, g_idle_check, g_idle_dispatch, NULL }; #ifdef HAVE_POLL /* SunOS has poll, but doesn't provide a prototype. */ # if defined (sun) && !defined (__SVR4) extern gint poll (GPollFD *ufds, guint nfsd, gint timeout); # endif /* !sun */ #else /* !HAVE_POLL */ #ifdef G_OS_WIN32 static gint g_poll (GPollFD *fds, guint nfds, gint timeout) { HANDLE handles[MAXIMUM_WAIT_OBJECTS]; gboolean poll_msgs = FALSE; GPollFD *f; DWORD ready; MSG msg; UINT timer; gint nhandles = 0; for (f = fds; f < &fds[nfds]; ++f) if (f->fd >= 0) { if (f->fd == G_WIN32_MSG_HANDLE) poll_msgs = TRUE; else if (nhandles == MAXIMUM_WAIT_OBJECTS) { g_warning (G_STRLOC ": Too many handles to wait for!\n"); break; } else { #ifdef G_MAIN_POLL_DEBUG g_print ("g_poll: waiting for %#x\n", f->fd); #endif handles[nhandles++] = (HANDLE) f->fd; } } if (timeout == -1) timeout = INFINITE; if (poll_msgs) { /* Waiting for messages, and maybe events * -> First PeekMessage */ #ifdef G_MAIN_POLL_DEBUG g_print ("PeekMessage\n"); #endif if (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE)) ready = WAIT_OBJECT_0 + nhandles; else { if (nhandles == 0) { /* Waiting just for messages */ if (timeout == INFINITE) { /* Infinite timeout * -> WaitMessage */ #ifdef G_MAIN_POLL_DEBUG g_print ("WaitMessage\n"); #endif if (!WaitMessage ()) { gchar *emsg = g_win32_error_message (GetLastError ()); g_warning (G_STRLOC ": WaitMessage() failed: %s", emsg); g_free (emsg); } ready = WAIT_OBJECT_0 + nhandles; } else if (timeout == 0) { /* Waiting just for messages, zero timeout. * If we got here, there was no message */ ready = WAIT_TIMEOUT; } else { /* Waiting just for messages, some timeout * -> Set a timer, wait for message, * kill timer, use PeekMessage */ timer = SetTimer (NULL, 0, timeout, NULL); if (timer == 0) { gchar *emsg = g_win32_error_message (GetLastError ()); g_warning (G_STRLOC ": SetTimer() failed: %s", emsg); g_free (emsg); ready = WAIT_TIMEOUT; } else { #ifdef G_MAIN_POLL_DEBUG g_print ("WaitMessage\n"); #endif WaitMessage (); KillTimer (NULL, timer); #ifdef G_MAIN_POLL_DEBUG g_print ("PeekMessage\n"); #endif if (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE) && msg.message != WM_TIMER) ready = WAIT_OBJECT_0; else ready = WAIT_TIMEOUT; } } } else { /* Wait for either message or event * -> Use MsgWaitForMultipleObjects */ #ifdef G_MAIN_POLL_DEBUG g_print ("MsgWaitForMultipleObjects(%d, %d)\n", nhandles, timeout); #endif ready = MsgWaitForMultipleObjects (nhandles, handles, FALSE, timeout, QS_ALLINPUT); if (ready == WAIT_FAILED) { gchar *emsg = g_win32_error_message (GetLastError ()); g_warning (G_STRLOC ": MsgWaitForMultipleObjects() failed: %s", emsg); g_free (emsg); } } } } else if (nhandles == 0) { /* Wait for nothing (huh?) */ return 0; } else { /* Wait for just events * -> Use WaitForMultipleObjects */ #ifdef G_MAIN_POLL_DEBUG g_print ("WaitForMultipleObjects(%d, %d)\n", nhandles, timeout); #endif ready = WaitForMultipleObjects (nhandles, handles, FALSE, timeout); if (ready == WAIT_FAILED) { gchar *emsg = g_win32_error_message (GetLastError ()); g_warning (G_STRLOC ": WaitForMultipleObjects() failed: %s", emsg); g_free (emsg); } } #ifdef G_MAIN_POLL_DEBUG g_print ("wait returns %ld%s\n", ready, (ready == WAIT_FAILED ? " (WAIT_FAILED)" : (ready == WAIT_TIMEOUT ? " (WAIT_TIMEOUT)" : (poll_msgs && ready == WAIT_OBJECT_0 + nhandles ? " (msg)" : "")))); #endif for (f = fds; f < &fds[nfds]; ++f) f->revents = 0; if (ready == WAIT_FAILED) return -1; else if (ready == WAIT_TIMEOUT) return 0; else if (poll_msgs && ready == WAIT_OBJECT_0 + nhandles) { for (f = fds; f < &fds[nfds]; ++f) if (f->fd >= 0) { if (f->events & G_IO_IN) if (f->fd == G_WIN32_MSG_HANDLE) f->revents |= G_IO_IN; } } else if (ready >= WAIT_OBJECT_0 && ready < WAIT_OBJECT_0 + nhandles) for (f = fds; f < &fds[nfds]; ++f) { if (f->fd == (gint) handles[ready - WAIT_OBJECT_0]) { f->revents = f->events; #ifdef G_MAIN_POLL_DEBUG g_print ("g_poll: got event %#x\n", f->fd); #endif } } return 1; } #else /* !G_OS_WIN32 */ /* The following implementation of poll() comes from the GNU C Library. * Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc. */ #include /* for bzero on BSD systems */ #ifdef HAVE_SYS_SELECT_H #include #endif /* HAVE_SYS_SELECT_H */ #ifdef G_OS_BEOS #undef NO_FD_SET #endif /* G_OS_BEOS */ #ifndef NO_FD_SET # define SELECT_MASK fd_set #else /* !NO_FD_SET */ # ifndef _AIX typedef long fd_mask; # endif /* _AIX */ # ifdef _IBMR2 # define SELECT_MASK void # else /* !_IBMR2 */ # define SELECT_MASK int # endif /* !_IBMR2 */ #endif /* !NO_FD_SET */ static gint g_poll (GPollFD *fds, guint nfds, gint timeout) { struct timeval tv; SELECT_MASK rset, wset, xset; GPollFD *f; int ready; int maxfd = 0; FD_ZERO (&rset); FD_ZERO (&wset); FD_ZERO (&xset); for (f = fds; f < &fds[nfds]; ++f) if (f->fd >= 0) { if (f->events & G_IO_IN) FD_SET (f->fd, &rset); if (f->events & G_IO_OUT) FD_SET (f->fd, &wset); if (f->events & G_IO_PRI) FD_SET (f->fd, &xset); if (f->fd > maxfd && (f->events & (G_IO_IN|G_IO_OUT|G_IO_PRI))) maxfd = f->fd; } tv.tv_sec = timeout / 1000; tv.tv_usec = (timeout % 1000) * 1000; ready = select (maxfd + 1, &rset, &wset, &xset, timeout == -1 ? NULL : &tv); if (ready > 0) for (f = fds; f < &fds[nfds]; ++f) { f->revents = 0; if (f->fd >= 0) { if (FD_ISSET (f->fd, &rset)) f->revents |= G_IO_IN; if (FD_ISSET (f->fd, &wset)) f->revents |= G_IO_OUT; if (FD_ISSET (f->fd, &xset)) f->revents |= G_IO_PRI; } } return ready; } #endif /* !G_OS_WIN32 */ #endif /* !HAVE_POLL */ /** * g_main_context_ref: * @context: a #GMainContext * * Increases the reference count on a #GMainContext object by one. * * Returns: the @context that was passed in (since 2.6) **/ GMainContext * g_main_context_ref (GMainContext *context) { g_return_val_if_fail (context != NULL, NULL); g_return_val_if_fail (g_atomic_int_get (&context->ref_count) > 0, NULL); g_atomic_int_inc (&context->ref_count); return context; } static inline void poll_rec_list_free (GMainContext *context, GPollRec *list) { g_slice_free_chain (GPollRec, list, next); } /** * g_main_context_unref: * @context: a #GMainContext * * Decreases the reference count on a #GMainContext object by one. If * the result is zero, free the context and free all associated memory. **/ void g_main_context_unref (GMainContext *context) { GSource *source; g_return_if_fail (context != NULL); g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0); if (!g_atomic_int_dec_and_test (&context->ref_count)) return; G_LOCK (main_context_list); main_context_list = g_slist_remove (main_context_list, context); G_UNLOCK (main_context_list); source = context->source_list; while (source) { GSource *next = source->next; g_source_destroy_internal (source, context, TRUE); source = next; } #ifdef G_THREADS_ENABLED g_static_mutex_free (&context->mutex); #endif g_ptr_array_free (context->pending_dispatches, TRUE); g_free (context->cached_poll_array); poll_rec_list_free (context, context->poll_records); #ifdef G_THREADS_ENABLED if (g_thread_supported()) { #ifndef G_OS_WIN32 close (context->wake_up_pipe[0]); close (context->wake_up_pipe[1]); #else CloseHandle (context->wake_up_semaphore); #endif } else main_contexts_without_pipe = g_slist_remove (main_contexts_without_pipe, context); #endif g_free (context); } #ifdef G_THREADS_ENABLED static void g_main_context_init_pipe (GMainContext *context) { # ifndef G_OS_WIN32 if (context->wake_up_pipe[0] != -1) return; if (pipe (context->wake_up_pipe) < 0) g_error ("Cannot create pipe main loop wake-up: %s\n", g_strerror (errno)); context->wake_up_rec.fd = context->wake_up_pipe[0]; context->wake_up_rec.events = G_IO_IN; # else if (context->wake_up_semaphore != NULL) return; context->wake_up_semaphore = CreateSemaphore (NULL, 0, 100, NULL); if (context->wake_up_semaphore == NULL) g_error ("Cannot create wake-up semaphore: %s", g_win32_error_message (GetLastError ())); context->wake_up_rec.fd = (gint) context->wake_up_semaphore; context->wake_up_rec.events = G_IO_IN; # ifdef G_MAIN_POLL_DEBUG g_print ("wake-up semaphore: %#x\n", (guint) context->wake_up_semaphore); # endif # endif g_main_context_add_poll_unlocked (context, 0, &context->wake_up_rec); } void _g_main_thread_init (void) { GSList *curr = main_contexts_without_pipe; while (curr) { g_main_context_init_pipe ((GMainContext *)curr->data); curr = curr->next; } g_slist_free (main_contexts_without_pipe); main_contexts_without_pipe = NULL; } #endif /* G_THREADS_ENABLED */ /** * g_main_context_new: * * Creates a new #GMainContext strcuture * * Return value: the new #GMainContext **/ GMainContext * g_main_context_new (void) { GMainContext *context = g_new0 (GMainContext, 1); #ifdef G_THREADS_ENABLED g_static_mutex_init (&context->mutex); context->owner = NULL; context->waiters = NULL; # ifndef G_OS_WIN32 context->wake_up_pipe[0] = -1; context->wake_up_pipe[1] = -1; # else context->wake_up_semaphore = NULL; # endif #endif context->ref_count = 1; context->next_id = 1; context->source_list = NULL; #if HAVE_POLL context->poll_func = (GPollFunc)poll; #else context->poll_func = g_poll; #endif context->cached_poll_array = NULL; context->cached_poll_array_size = 0; context->pending_dispatches = g_ptr_array_new (); context->time_is_current = FALSE; #ifdef G_THREADS_ENABLED if (g_thread_supported ()) g_main_context_init_pipe (context); else main_contexts_without_pipe = g_slist_prepend (main_contexts_without_pipe, context); #endif G_LOCK (main_context_list); main_context_list = g_slist_append (main_context_list, context); G_UNLOCK (main_context_list); return context; } /** * g_main_context_default: * * Returns the default main context. This is the main context used * for main loop functions when a main loop is not explicitly * specified. * * Return value: the default main context. **/ GMainContext * g_main_context_default (void) { /* Slow, but safe */ G_LOCK (main_loop); if (!default_main_context) default_main_context = g_main_context_new (); G_UNLOCK (main_loop); return default_main_context; } /* Hooks for adding to the main loop */ /** * g_source_new: * @source_funcs: structure containing functions that implement * the sources behavior. * @struct_size: size of the #GSource structure to create. * * Creates a new #GSource structure. The size is specified to * allow creating structures derived from #GSource that contain * additional data. The size passed in must be at least * sizeof (GSource). * * The source will not initially be associated with any #GMainContext * and must be added to one with g_source_attach() before it will be * executed. * * Return value: the newly-created #GSource. **/ GSource * g_source_new (GSourceFuncs *source_funcs, guint struct_size) { GSource *source; g_return_val_if_fail (source_funcs != NULL, NULL); g_return_val_if_fail (struct_size >= sizeof (GSource), NULL); source = (GSource*) g_malloc0 (struct_size); source->source_funcs = source_funcs; source->ref_count = 1; source->priority = G_PRIORITY_DEFAULT; source->flags = G_HOOK_FLAG_ACTIVE; /* NULL/0 initialization for all other fields */ return source; } /* Holds context's lock */ static void g_source_list_add (GSource *source, GMainContext *context) { GSource *tmp_source, *last_source; last_source = NULL; tmp_source = context->source_list; while (tmp_source && tmp_source->priority <= source->priority) { last_source = tmp_source; tmp_source = tmp_source->next; } source->next = tmp_source; if (tmp_source) tmp_source->prev = source; source->prev = last_source; if (last_source) last_source->next = source; else context->source_list = source; } /* Holds context's lock */ static void g_source_list_remove (GSource *source, GMainContext *context) { if (source->prev) source->prev->next = source->next; else context->source_list = source->next; if (source->next) source->next->prev = source->prev; source->prev = NULL; source->next = NULL; } /** * g_source_attach: * @source: a #GSource * @context: a #GMainContext (if %NULL, the default context will be used) * * Adds a #GSource to a @context so that it will be executed within * that context. * * Return value: the ID (greater than 0) for the source within the * #GMainContext. **/ guint g_source_attach (GSource *source, GMainContext *context) { guint result = 0; GSList *tmp_list; g_return_val_if_fail (source->context == NULL, 0); g_return_val_if_fail (!SOURCE_DESTROYED (source), 0); if (!context) context = g_main_context_default (); LOCK_CONTEXT (context); source->context = context; result = source->source_id = context->next_id++; source->ref_count++; g_source_list_add (source, context); tmp_list = source->poll_fds; while (tmp_list) { g_main_context_add_poll_unlocked (context, source->priority, tmp_list->data); tmp_list = tmp_list->next; } #ifdef G_THREADS_ENABLED /* Now wake up the main loop if it is waiting in the poll() */ g_main_context_wakeup_unlocked (context); #endif UNLOCK_CONTEXT (context); return result; } static void g_source_destroy_internal (GSource *source, GMainContext *context, gboolean have_lock) { if (!have_lock) LOCK_CONTEXT (context); if (!SOURCE_DESTROYED (source)) { GSList *tmp_list; gpointer old_cb_data; GSourceCallbackFuncs *old_cb_funcs; source->flags &= ~G_HOOK_FLAG_ACTIVE; old_cb_data = source->callback_data; old_cb_funcs = source->callback_funcs; source->callback_data = NULL; source->callback_funcs = NULL; if (old_cb_funcs) { UNLOCK_CONTEXT (context); old_cb_funcs->unref (old_cb_data); LOCK_CONTEXT (context); } if (!SOURCE_BLOCKED (source)) { tmp_list = source->poll_fds; while (tmp_list) { g_main_context_remove_poll_unlocked (context, tmp_list->data); tmp_list = tmp_list->next; } } g_source_unref_internal (source, context, TRUE); } if (!have_lock) UNLOCK_CONTEXT (context); } /** * g_source_destroy: * @source: a #GSource * * Removes a source from its #GMainContext, if any, and mark it as * destroyed. The source cannot be subsequently added to another * context. **/ void g_source_destroy (GSource *source) { GMainContext *context; g_return_if_fail (source != NULL); context = source->context; if (context) g_source_destroy_internal (source, context, FALSE); else source->flags &= ~G_HOOK_FLAG_ACTIVE; } /** * g_source_get_id: * @source: a #GSource * * Returns the numeric ID for a particular source. The ID of a source * is a positive integer which is unique within a particular main loop * context. The reverse * mapping from ID to source is done by g_main_context_find_source_by_id(). * * Return value: the ID (greater than 0) for the source **/ guint g_source_get_id (GSource *source) { guint result; g_return_val_if_fail (source != NULL, 0); g_return_val_if_fail (source->context != NULL, 0); LOCK_CONTEXT (source->context); result = source->source_id; UNLOCK_CONTEXT (source->context); return result; } /** * g_source_get_context: * @source: a #GSource * * Gets the #GMainContext with which the source is associated. * Calling this function on a destroyed source is an error. * * Return value: the #GMainContext with which the source is associated, * or %NULL if the context has not yet been added * to a source. **/ GMainContext * g_source_get_context (GSource *source) { g_return_val_if_fail (!SOURCE_DESTROYED (source), NULL); return source->context; } /** * g_source_add_poll: * @source:a #GSource * @fd: a #GPollFD structure holding information about a file * descriptor to watch. * * Adds a file descriptor to the set of file descriptors polled for * this source. This is usually combined with g_source_new() to add an * event source. The event source's check function will typically test * the @revents field in the #GPollFD struct and return %TRUE if events need * to be processed. **/ void g_source_add_poll (GSource *source, GPollFD *fd) { GMainContext *context; g_return_if_fail (source != NULL); g_return_if_fail (fd != NULL); g_return_if_fail (!SOURCE_DESTROYED (source)); context = source->context; if (context) LOCK_CONTEXT (context); source->poll_fds = g_slist_prepend (source->poll_fds, fd); if (context) { if (!SOURCE_BLOCKED (source)) g_main_context_add_poll_unlocked (context, source->priority, fd); UNLOCK_CONTEXT (context); } } /** * g_source_remove_poll: * @source:a #GSource * @fd: a #GPollFD structure previously passed to g_source_add_poll(). * * Removes a file descriptor from the set of file descriptors polled for * this source. **/ void g_source_remove_poll (GSource *source, GPollFD *fd) { GMainContext *context; g_return_if_fail (source != NULL); g_return_if_fail (fd != NULL); g_return_if_fail (!SOURCE_DESTROYED (source)); context = source->context; if (context) LOCK_CONTEXT (context); source->poll_fds = g_slist_remove (source->poll_fds, fd); if (context) { if (!SOURCE_BLOCKED (source)) g_main_context_remove_poll_unlocked (context, fd); UNLOCK_CONTEXT (context); } } /** * g_source_set_callback_indirect: * @source: the source * @callback_data: pointer to callback data "object" * @callback_funcs: functions for reference counting @callback_data * and getting the callback and data * * Sets the callback function storing the data as a refcounted callback * "object". This is used internally. Note that calling * g_source_set_callback_indirect() assumes * an initial reference count on @callback_data, and thus * @callback_funcs->unref will eventually be called once more * than @callback_funcs->ref. **/ void g_source_set_callback_indirect (GSource *source, gpointer callback_data, GSourceCallbackFuncs *callback_funcs) { GMainContext *context; gpointer old_cb_data; GSourceCallbackFuncs *old_cb_funcs; g_return_if_fail (source != NULL); g_return_if_fail (callback_funcs != NULL || callback_data == NULL); context = source->context; if (context) LOCK_CONTEXT (context); old_cb_data = source->callback_data; old_cb_funcs = source->callback_funcs; source->callback_data = callback_data; source->callback_funcs = callback_funcs; if (context) UNLOCK_CONTEXT (context); if (old_cb_funcs) old_cb_funcs->unref (old_cb_data); } static void g_source_callback_ref (gpointer cb_data) { GSourceCallback *callback = cb_data; callback->ref_count++; } static void g_source_callback_unref (gpointer cb_data) { GSourceCallback *callback = cb_data; callback->ref_count--; if (callback->ref_count == 0) { if (callback->notify) callback->notify (callback->data); g_free (callback); } } static void g_source_callback_get (gpointer cb_data, GSource *source, GSourceFunc *func, gpointer *data) { GSourceCallback *callback = cb_data; *func = callback->func; *data = callback->data; } static GSourceCallbackFuncs g_source_callback_funcs = { g_source_callback_ref, g_source_callback_unref, g_source_callback_get, }; /** * g_source_set_callback: * @source: the source * @func: a callback function * @data: the data to pass to callback function * @notify: a function to call when @data is no longer in use, or %NULL. * * Sets the callback function for a source. The callback for a source is * called from the source's dispatch function. * * The exact type of @func depends on the type of source; ie. you * should not count on @func being called with @data as its first * parameter. * * Typically, you won't use this function. Instead use functions specific * to the type of source you are using. **/ void g_source_set_callback (GSource *source, GSourceFunc func, gpointer data, GDestroyNotify notify) { GSourceCallback *new_callback; g_return_if_fail (source != NULL); new_callback = g_new (GSourceCallback, 1); new_callback->ref_count = 1; new_callback->func = func; new_callback->data = data; new_callback->notify = notify; g_source_set_callback_indirect (source, new_callback, &g_source_callback_funcs); } /** * g_source_set_priority: * @source: a #GSource * @priority: the new priority. * * Sets the priority of a source. While the main loop is being * run, a source will be dispatched if it is ready to be dispatched and no sources * at a higher (numerically smaller) priority are ready to be dispatched. **/ void g_source_set_priority (GSource *source, gint priority) { GSList *tmp_list; GMainContext *context; g_return_if_fail (source != NULL); context = source->context; if (context) LOCK_CONTEXT (context); source->priority = priority; if (context) { /* Remove the source from the context's source and then * add it back so it is sorted in the correct plcae */ g_source_list_remove (source, source->context); g_source_list_add (source, source->context); if (!SOURCE_BLOCKED (source)) { tmp_list = source->poll_fds; while (tmp_list) { g_main_context_remove_poll_unlocked (context, tmp_list->data); g_main_context_add_poll_unlocked (context, priority, tmp_list->data); tmp_list = tmp_list->next; } } UNLOCK_CONTEXT (source->context); } } /** * g_source_get_priority: * @source: a #GSource * * Gets the priority of a source. * * Return value: the priority of the source **/ gint g_source_get_priority (GSource *source) { g_return_val_if_fail (source != NULL, 0); return source->priority; } /** * g_source_set_can_recurse: * @source: a #GSource * @can_recurse: whether recursion is allowed for this source * * Sets whether a source can be called recursively. If @can_recurse is * %TRUE, then while the source is being dispatched then this source * will be processed normally. Otherwise, all processing of this * source is blocked until the dispatch function returns. **/ void g_source_set_can_recurse (GSource *source, gboolean can_recurse) { GMainContext *context; g_return_if_fail (source != NULL); context = source->context; if (context) LOCK_CONTEXT (context); if (can_recurse) source->flags |= G_SOURCE_CAN_RECURSE; else source->flags &= ~G_SOURCE_CAN_RECURSE; if (context) UNLOCK_CONTEXT (context); } /** * g_source_get_can_recurse: * @source: a #GSource * * Checks whether a source is allowed to be called recursively. * see g_source_set_can_recurse(). * * Return value: whether recursion is allowed. **/ gboolean g_source_get_can_recurse (GSource *source) { g_return_val_if_fail (source != NULL, FALSE); return (source->flags & G_SOURCE_CAN_RECURSE) != 0; } /** * g_source_ref: * @source: a #GSource * * Increases the reference count on a source by one. * * Return value: @source **/ GSource * g_source_ref (GSource *source) { GMainContext *context; g_return_val_if_fail (source != NULL, NULL); context = source->context; if (context) LOCK_CONTEXT (context); source->ref_count++; if (context) UNLOCK_CONTEXT (context); return source; } /* g_source_unref() but possible to call within context lock */ static void g_source_unref_internal (GSource *source, GMainContext *context, gboolean have_lock) { gpointer old_cb_data = NULL; GSourceCallbackFuncs *old_cb_funcs = NULL; g_return_if_fail (source != NULL); if (!have_lock && context) LOCK_CONTEXT (context); source->ref_count--; if (source->ref_count == 0) { old_cb_data = source->callback_data; old_cb_funcs = source->callback_funcs; source->callback_data = NULL; source->callback_funcs = NULL; if (context && !SOURCE_DESTROYED (source)) { g_warning (G_STRLOC ": ref_count == 0, but source is still attached to a context!"); source->ref_count++; } else if (context) g_source_list_remove (source, context); if (source->source_funcs->finalize) source->source_funcs->finalize (source); g_slist_free (source->poll_fds); source->poll_fds = NULL; g_free (source); } if (!have_lock && context) UNLOCK_CONTEXT (context); if (old_cb_funcs) { if (have_lock) UNLOCK_CONTEXT (context); old_cb_funcs->unref (old_cb_data); if (have_lock) LOCK_CONTEXT (context); } } /** * g_source_unref: * @source: a #GSource * * Decreases the reference count of a source by one. If the * resulting reference count is zero the source and associated * memory will be destroyed. **/ void g_source_unref (GSource *source) { g_return_if_fail (source != NULL); g_source_unref_internal (source, source->context, FALSE); } /** * g_main_context_find_source_by_id: * @context: a #GMainContext (if %NULL, the default context will be used) * @source_id: the source ID, as returned by g_source_get_id(). * * Finds a #GSource given a pair of context and ID. * * Return value: the #GSource if found, otherwise, %NULL **/ GSource * g_main_context_find_source_by_id (GMainContext *context, guint source_id) { GSource *source; g_return_val_if_fail (source_id > 0, NULL); if (context == NULL) context = g_main_context_default (); LOCK_CONTEXT (context); source = context->source_list; while (source) { if (!SOURCE_DESTROYED (source) && source->source_id == source_id) break; source = source->next; } UNLOCK_CONTEXT (context); return source; } /** * g_main_context_find_source_by_funcs_user_data: * @context: a #GMainContext (if %NULL, the default context will be used). * @funcs: the @source_funcs passed to g_source_new(). * @user_data: the user data from the callback. * * Finds a source with the given source functions and user data. If * multiple sources exist with the same source function and user data, * the first one found will be returned. * * Return value: the source, if one was found, otherwise %NULL **/ GSource * g_main_context_find_source_by_funcs_user_data (GMainContext *context, GSourceFuncs *funcs, gpointer user_data) { GSource *source; g_return_val_if_fail (funcs != NULL, NULL); if (context == NULL) context = g_main_context_default (); LOCK_CONTEXT (context); source = context->source_list; while (source) { if (!SOURCE_DESTROYED (source) && source->source_funcs == funcs && source->callback_funcs) { GSourceFunc callback; gpointer callback_data; source->callback_funcs->get (source->callback_data, source, &callback, &callback_data); if (callback_data == user_data) break; } source = source->next; } UNLOCK_CONTEXT (context); return source; } /** * g_main_context_find_source_by_user_data: * @context: a #GMainContext * @user_data: the user_data for the callback. * * Finds a source with the given user data for the callback. If * multiple sources exist with the same user data, the first * one found will be returned. * * Return value: the source, if one was found, otherwise %NULL **/ GSource * g_main_context_find_source_by_user_data (GMainContext *context, gpointer user_data) { GSource *source; if (context == NULL) context = g_main_context_default (); LOCK_CONTEXT (context); source = context->source_list; while (source) { if (!SOURCE_DESTROYED (source) && source->callback_funcs) { GSourceFunc callback; gpointer callback_data = NULL; source->callback_funcs->get (source->callback_data, source, &callback, &callback_data); if (callback_data == user_data) break; } source = source->next; } UNLOCK_CONTEXT (context); return source; } /** * g_source_remove: * @tag: the ID of the source to remove. * * Removes the source with the given id from the default main context. * The id of * a #GSource is given by g_source_get_id(), or will be returned by the * functions g_source_attach(), g_idle_add(), g_idle_add_full(), * g_timeout_add(), g_timeout_add_full(), g_child_watch_add(), * g_child_watch_add_full(), g_io_add_watch(), and g_io_add_watch_full(). * * See also g_source_destroy(). * * Return value: %TRUE if the source was found and removed. **/ gboolean g_source_remove (guint tag) { GSource *source; g_return_val_if_fail (tag > 0, FALSE); source = g_main_context_find_source_by_id (NULL, tag); if (source) g_source_destroy (source); return source != NULL; } /** * g_source_remove_by_user_data: * @user_data: the user_data for the callback. * * Removes a source from the default main loop context given the user * data for the callback. If multiple sources exist with the same user * data, only one will be destroyed. * * Return value: %TRUE if a source was found and removed. **/ gboolean g_source_remove_by_user_data (gpointer user_data) { GSource *source; source = g_main_context_find_source_by_user_data (NULL, user_data); if (source) { g_source_destroy (source); return TRUE; } else return FALSE; } /** * g_source_remove_by_funcs_user_data: * @funcs: The @source_funcs passed to g_source_new() * @user_data: the user data for the callback * * Removes a source from the default main loop context given the * source functions and user data. If multiple sources exist with the * same source functions and user data, only one will be destroyed. * * Return value: %TRUE if a source was found and removed. **/ gboolean g_source_remove_by_funcs_user_data (GSourceFuncs *funcs, gpointer user_data) { GSource *source; g_return_val_if_fail (funcs != NULL, FALSE); source = g_main_context_find_source_by_funcs_user_data (NULL, funcs, user_data); if (source) { g_source_destroy (source); return TRUE; } else return FALSE; } /** * g_get_current_time: * @result: #GTimeVal structure in which to store current time. * * Equivalent to the UNIX gettimeofday() function, but portable. **/ void g_get_current_time (GTimeVal *result) { #ifndef G_OS_WIN32 struct timeval r; g_return_if_fail (result != NULL); /*this is required on alpha, there the timeval structs are int's not longs and a cast only would fail horribly*/ gettimeofday (&r, NULL); result->tv_sec = r.tv_sec; result->tv_usec = r.tv_usec; #else FILETIME ft; guint64 *time64 = (guint64 *) &ft; GetSystemTimeAsFileTime (&ft); /* Convert from 100s of nanoseconds since 1601-01-01 * to Unix epoch. Yes, this is Y2038 unsafe. */ *time64 -= G_GINT64_CONSTANT (116444736000000000); *time64 /= 10; result->tv_sec = *time64 / 1000000; result->tv_usec = *time64 % 1000000; #endif } /* Running the main loop */ static gint * get_depth_pointer (void) { static GStaticPrivate depth_private = G_STATIC_PRIVATE_INIT; gint *depth_pointer = g_static_private_get (&depth_private); if (!depth_pointer) { depth_pointer = g_new (gint, 1); *depth_pointer = 0; g_static_private_set (&depth_private, depth_pointer, g_free); } return depth_pointer; } /** * g_main_depth: * * Return value: The main loop recursion level in the current thread * * Returns the depth of the stack of calls to * g_main_context_dispatch() on any #GMainContext in the current thread. * That is, when called from the toplevel, it gives 0. When * called from within a callback from g_main_context_iteration() * (or g_main_loop_run(), etc.) it returns 1. When called from within * a callback to a recursive call to g_main_context_iterate(), * it returns 2. And so forth. * * This function is useful in a situation like the following: * Imagine an extremely simple "garbage collected" system. * * * static GList *free_list; * * gpointer * allocate_memory (gsize size) * { * gpointer result = g_malloc (size); * free_list = g_list_prepend (free_list, result); * return result; * } * * void * free_allocated_memory (void) * { * GList *l; * for (l = free_list; l; l = l->next); * g_free (l->data); * g_list_free (free_list); * free_list = NULL; * } * * [...] * * while (TRUE); * { * g_main_context_iteration (NULL, TRUE); * free_allocated_memory(); * } * * * This works from an application, however, if you want to do the same * thing from a library, it gets more difficult, since you no longer * control the main loop. You might think you can simply use an idle * function to make the call to free_allocated_memory(), but that * doesn't work, since the idle function could be called from a * recursive callback. This can be fixed by using g_main_depth() * * * gpointer * allocate_memory (gsize size) * { * FreeListBlock *block = g_new (FreeListBlock, 1);\ * block->mem = g_malloc (size); * block->depth = g_main_depth (); * free_list = g_list_prepend (free_list, block); * return block->mem; * } * * void * free_allocated_memory (void) * { * GList *l; * * int depth = g_main_depth (); * for (l = free_list; l; ); * { * GList *next = l->next; * FreeListBlock *block = l->data; * if (block->depth > depth) * { * g_free (block->mem); * g_free (block); * free_list = g_list_delete_link (free_list, l); * } * * l = next; * } * } * * * There is a temptation to use g_main_depth() to solve * problems with reentrancy. For instance, while waiting for data * to be received from the network in response to a menu item, * the menu item might be selected again. It might seem that * one could make the menu item's callback return immediately * and do nothing if g_main_depth() returns a value greater than 1. * However, this should be avoided since the user then sees selecting * the menu item do nothing. Furthermore, you'll find yourself adding * these checks all over your code, since there are doubtless many, * many things that the user could do. Instead, you can use the * following techniques: * * * * * Use gtk_widget_set_sensitive() or modal dialogs to prevent * the user from interacting with elements while the main * loop is recursing. * * * * * Avoid main loop recursion in situations where you can't handle * arbitrary callbacks. Instead, structure your code so that you * simply return to the main loop and then get called again when * there is more work to do. * * * **/ int g_main_depth (void) { gint *depth = get_depth_pointer (); return *depth; } /* Temporarily remove all this source's file descriptors from the * poll(), so that if data comes available for one of the file descriptors * we don't continually spin in the poll() */ /* HOLDS: source->context's lock */ static void block_source (GSource *source) { GSList *tmp_list; g_return_if_fail (!SOURCE_BLOCKED (source)); tmp_list = source->poll_fds; while (tmp_list) { g_main_context_remove_poll_unlocked (source->context, tmp_list->data); tmp_list = tmp_list->next; } } /* HOLDS: source->context's lock */ static void unblock_source (GSource *source) { GSList *tmp_list; g_return_if_fail (!SOURCE_BLOCKED (source)); /* Source already unblocked */ g_return_if_fail (!SOURCE_DESTROYED (source)); tmp_list = source->poll_fds; while (tmp_list) { g_main_context_add_poll_unlocked (source->context, source->priority, tmp_list->data); tmp_list = tmp_list->next; } } /* HOLDS: context's lock */ static void g_main_dispatch (GMainContext *context) { gint *depth = get_depth_pointer (); guint i; for (i = 0; i < context->pending_dispatches->len; i++) { GSource *source = context->pending_dispatches->pdata[i]; context->pending_dispatches->pdata[i] = NULL; g_assert (source); source->flags &= ~G_SOURCE_READY; if (!SOURCE_DESTROYED (source)) { gboolean was_in_call; gpointer user_data = NULL; GSourceFunc callback = NULL; GSourceCallbackFuncs *cb_funcs; gpointer cb_data; gboolean need_destroy; gboolean (*dispatch) (GSource *, GSourceFunc, gpointer); dispatch = source->source_funcs->dispatch; cb_funcs = source->callback_funcs; cb_data = source->callback_data; if (cb_funcs) cb_funcs->ref (cb_data); if ((source->flags & G_SOURCE_CAN_RECURSE) == 0) block_source (source); was_in_call = source->flags & G_HOOK_FLAG_IN_CALL; source->flags |= G_HOOK_FLAG_IN_CALL; if (cb_funcs) cb_funcs->get (cb_data, source, &callback, &user_data); UNLOCK_CONTEXT (context); (*depth)++; need_destroy = ! dispatch (source, callback, user_data); (*depth)--; if (cb_funcs) cb_funcs->unref (cb_data); LOCK_CONTEXT (context); if (!was_in_call) source->flags &= ~G_HOOK_FLAG_IN_CALL; if ((source->flags & G_SOURCE_CAN_RECURSE) == 0 && !SOURCE_DESTROYED (source)) unblock_source (source); /* Note: this depends on the fact that we can't switch * sources from one main context to another */ if (need_destroy && !SOURCE_DESTROYED (source)) { g_assert (source->context == context); g_source_destroy_internal (source, context, TRUE); } } SOURCE_UNREF (source, context); } g_ptr_array_set_size (context->pending_dispatches, 0); } /* Holds context's lock */ static inline GSource * next_valid_source (GMainContext *context, GSource *source) { GSource *new_source = source ? source->next : context->source_list; while (new_source) { if (!SOURCE_DESTROYED (new_source)) { new_source->ref_count++; break; } new_source = new_source->next; } if (source) SOURCE_UNREF (source, context); return new_source; } /** * g_main_context_acquire: * @context: a #GMainContext * * Tries to become the owner of the specified context. * If some other context is the owner of the context, * returns %FALSE immediately. Ownership is properly * recursive: the owner can require ownership again * and will release ownership when g_main_context_release() * is called as many times as g_main_context_acquire(). * * You must be the owner of a context before you * can call g_main_context_prepare(), g_main_context_query(), * g_main_context_check(), g_main_context_dispatch(). * * Return value: %TRUE if the operation succeeded, and * this thread is now the owner of @context. **/ gboolean g_main_context_acquire (GMainContext *context) { #ifdef G_THREADS_ENABLED gboolean result = FALSE; GThread *self = G_THREAD_SELF; if (context == NULL) context = g_main_context_default (); LOCK_CONTEXT (context); if (!context->owner) { context->owner = self; g_assert (context->owner_count == 0); } if (context->owner == self) { context->owner_count++; result = TRUE; } UNLOCK_CONTEXT (context); return result; #else /* !G_THREADS_ENABLED */ return TRUE; #endif /* G_THREADS_ENABLED */ } /** * g_main_context_release: * @context: a #GMainContext * * Releases ownership of a context previously acquired by this thread * with g_main_context_acquire(). If the context was acquired multiple * times, the only release ownership when g_main_context_release() * is called as many times as it was acquired. **/ void g_main_context_release (GMainContext *context) { #ifdef G_THREADS_ENABLED if (context == NULL) context = g_main_context_default (); LOCK_CONTEXT (context); context->owner_count--; if (context->owner_count == 0) { context->owner = NULL; if (context->waiters) { GMainWaiter *waiter = context->waiters->data; gboolean loop_internal_waiter = (waiter->mutex == g_static_mutex_get_mutex (&context->mutex)); context->waiters = g_slist_delete_link (context->waiters, context->waiters); if (!loop_internal_waiter) g_mutex_lock (waiter->mutex); g_cond_signal (waiter->cond); if (!loop_internal_waiter) g_mutex_unlock (waiter->mutex); } } UNLOCK_CONTEXT (context); #endif /* G_THREADS_ENABLED */ } /** * g_main_context_wait: * @context: a #GMainContext * @cond: a condition variable * @mutex: a mutex, currently held * * Tries to become the owner of the specified context, * as with g_main_context_acquire(). But if another thread * is the owner, atomically drop @mutex and wait on @cond until * that owner releases ownership or until @cond is signaled, then * try again (once) to become the owner. * * Return value: %TRUE if the operation succeeded, and * this thread is now the owner of @context. **/ gboolean g_main_context_wait (GMainContext *context, GCond *cond, GMutex *mutex) { #ifdef G_THREADS_ENABLED gboolean result = FALSE; GThread *self = G_THREAD_SELF; gboolean loop_internal_waiter; if (context == NULL) context = g_main_context_default (); loop_internal_waiter = (mutex == g_static_mutex_get_mutex (&context->mutex)); if (!loop_internal_waiter) LOCK_CONTEXT (context); if (context->owner && context->owner != self) { GMainWaiter waiter; waiter.cond = cond; waiter.mutex = mutex; context->waiters = g_slist_append (context->waiters, &waiter); if (!loop_internal_waiter) UNLOCK_CONTEXT (context); g_cond_wait (cond, mutex); if (!loop_internal_waiter) LOCK_CONTEXT (context); context->waiters = g_slist_remove (context->waiters, &waiter); } if (!context->owner) { context->owner = self; g_assert (context->owner_count == 0); } if (context->owner == self) { context->owner_count++; result = TRUE; } if (!loop_internal_waiter) UNLOCK_CONTEXT (context); return result; #else /* !G_THREADS_ENABLED */ return TRUE; #endif /* G_THREADS_ENABLED */ } /** * g_main_context_prepare: * @context: a #GMainContext * @priority: location to store priority of highest priority * source already ready. * * Prepares to poll sources within a main loop. The resulting information * for polling is determined by calling g_main_context_query (). * * Return value: %TRUE if some source is ready to be dispatched * prior to polling. **/ gboolean g_main_context_prepare (GMainContext *context, gint *priority) { gint i; gint n_ready = 0; gint current_priority = G_MAXINT; GSource *source; if (context == NULL) context = g_main_context_default (); LOCK_CONTEXT (context); context->time_is_current = FALSE; if (context->in_check_or_prepare) { g_warning ("g_main_context_prepare() called recursively from within a source's check() or " "prepare() member."); UNLOCK_CONTEXT (context); return FALSE; } #ifdef G_THREADS_ENABLED if (context->poll_waiting) { g_warning("g_main_context_prepare(): main loop already active in another thread"); UNLOCK_CONTEXT (context); return FALSE; } context->poll_waiting = TRUE; #endif /* G_THREADS_ENABLED */ #if 0 /* If recursing, finish up current dispatch, before starting over */ if (context->pending_dispatches) { if (dispatch) g_main_dispatch (context, ¤t_time); UNLOCK_CONTEXT (context); return TRUE; } #endif /* If recursing, clear list of pending dispatches */ for (i = 0; i < context->pending_dispatches->len; i++) { if (context->pending_dispatches->pdata[i]) SOURCE_UNREF ((GSource *)context->pending_dispatches->pdata[i], context); } g_ptr_array_set_size (context->pending_dispatches, 0); /* Prepare all sources */ context->timeout = -1; source = next_valid_source (context, NULL); while (source) { gint source_timeout = -1; if ((n_ready > 0) && (source->priority > current_priority)) { SOURCE_UNREF (source, context); break; } if (SOURCE_BLOCKED (source)) goto next; if (!(source->flags & G_SOURCE_READY)) { gboolean result; gboolean (*prepare) (GSource *source, gint *timeout); prepare = source->source_funcs->prepare; context->in_check_or_prepare++; UNLOCK_CONTEXT (context); result = (*prepare) (source, &source_timeout); LOCK_CONTEXT (context); context->in_check_or_prepare--; if (result) source->flags |= G_SOURCE_READY; } if (source->flags & G_SOURCE_READY) { n_ready++; current_priority = source->priority; context->timeout = 0; } if (source_timeout >= 0) { if (context->timeout < 0) context->timeout = source_timeout; else context->timeout = MIN (context->timeout, source_timeout); } next: source = next_valid_source (context, source); } UNLOCK_CONTEXT (context); if (priority) *priority = current_priority; return (n_ready > 0); } /** * g_main_context_query: * @context: a #GMainContext * @max_priority: maximum priority source to check * @timeout_: location to store timeout to be used in polling * @fds: location to store #GPollFD records that need to be polled. * @n_fds: length of @fds. * * Determines information necessary to poll this main loop. * * Return value: the number of records actually stored in @fds, * or, if more than @n_fds records need to be stored, the number * of records that need to be stored. **/ gint g_main_context_query (GMainContext *context, gint max_priority, gint *timeout, GPollFD *fds, gint n_fds) { gint n_poll; GPollRec *pollrec; LOCK_CONTEXT (context); pollrec = context->poll_records; n_poll = 0; while (pollrec && max_priority >= pollrec->priority) { if (pollrec->fd->events) { if (n_poll < n_fds) { fds[n_poll].fd = pollrec->fd->fd; /* In direct contradiction to the Unix98 spec, IRIX runs into * difficulty if you pass in POLLERR, POLLHUP or POLLNVAL * flags in the events field of the pollfd while it should * just ignoring them. So we mask them out here. */ fds[n_poll].events = pollrec->fd->events & ~(G_IO_ERR|G_IO_HUP|G_IO_NVAL); fds[n_poll].revents = 0; } n_poll++; } pollrec = pollrec->next; } #ifdef G_THREADS_ENABLED context->poll_changed = FALSE; #endif if (timeout) { *timeout = context->timeout; if (*timeout != 0) context->time_is_current = FALSE; } UNLOCK_CONTEXT (context); return n_poll; } /** * g_main_context_check: * @context: a #GMainContext * @max_priority: the maximum numerical priority of sources to check * @fds: array of #GPollFD's that was passed to the last call to * g_main_context_query() * @n_fds: return value of g_main_context_query() * * Passes the results of polling back to the main loop. * * Return value: %TRUE if some sources are ready to be dispatched. **/ gboolean g_main_context_check (GMainContext *context, gint max_priority, GPollFD *fds, gint n_fds) { GSource *source; GPollRec *pollrec; gint n_ready = 0; gint i; LOCK_CONTEXT (context); if (context->in_check_or_prepare) { g_warning ("g_main_context_check() called recursively from within a source's check() or " "prepare() member."); UNLOCK_CONTEXT (context); return FALSE; } #ifdef G_THREADS_ENABLED if (!context->poll_waiting) { #ifndef G_OS_WIN32 gchar a; read (context->wake_up_pipe[0], &a, 1); #endif } else context->poll_waiting = FALSE; /* If the set of poll file descriptors changed, bail out * and let the main loop rerun */ if (context->poll_changed) { UNLOCK_CONTEXT (context); return 0; } #endif /* G_THREADS_ENABLED */ pollrec = context->poll_records; i = 0; while (i < n_fds) { if (pollrec->fd->events) { pollrec->fd->revents = fds[i].revents; i++; } pollrec = pollrec->next; } source = next_valid_source (context, NULL); while (source) { if ((n_ready > 0) && (source->priority > max_priority)) { SOURCE_UNREF (source, context); break; } if (SOURCE_BLOCKED (source)) goto next; if (!(source->flags & G_SOURCE_READY)) { gboolean result; gboolean (*check) (GSource *source); check = source->source_funcs->check; context->in_check_or_prepare++; UNLOCK_CONTEXT (context); result = (*check) (source); LOCK_CONTEXT (context); context->in_check_or_prepare--; if (result) source->flags |= G_SOURCE_READY; } if (source->flags & G_SOURCE_READY) { source->ref_count++; g_ptr_array_add (context->pending_dispatches, source); n_ready++; /* never dispatch sources with less priority than the first * one we choose to dispatch */ max_priority = source->priority; } next: source = next_valid_source (context, source); } UNLOCK_CONTEXT (context); return n_ready > 0; } /** * g_main_context_dispatch: * @context: a #GMainContext * * Dispatches all pending sources. **/ void g_main_context_dispatch (GMainContext *context) { LOCK_CONTEXT (context); if (context->pending_dispatches->len > 0) { g_main_dispatch (context); } UNLOCK_CONTEXT (context); } /* HOLDS context lock */ static gboolean g_main_context_iterate (GMainContext *context, gboolean block, gboolean dispatch, GThread *self) { gint max_priority; gint timeout; gboolean some_ready; gint nfds, allocated_nfds; GPollFD *fds = NULL; UNLOCK_CONTEXT (context); #ifdef G_THREADS_ENABLED if (!g_main_context_acquire (context)) { gboolean got_ownership; g_return_val_if_fail (g_thread_supported (), FALSE); if (!block) return FALSE; LOCK_CONTEXT (context); if (!context->cond) context->cond = g_cond_new (); got_ownership = g_main_context_wait (context, context->cond, g_static_mutex_get_mutex (&context->mutex)); if (!got_ownership) { UNLOCK_CONTEXT (context); return FALSE; } } else LOCK_CONTEXT (context); #endif /* G_THREADS_ENABLED */ if (!context->cached_poll_array) { context->cached_poll_array_size = context->n_poll_records; context->cached_poll_array = g_new (GPollFD, context->n_poll_records); } allocated_nfds = context->cached_poll_array_size; fds = context->cached_poll_array; UNLOCK_CONTEXT (context); g_main_context_prepare (context, &max_priority); while ((nfds = g_main_context_query (context, max_priority, &timeout, fds, allocated_nfds)) > allocated_nfds) { LOCK_CONTEXT (context); g_free (fds); context->cached_poll_array_size = allocated_nfds = nfds; context->cached_poll_array = fds = g_new (GPollFD, nfds); UNLOCK_CONTEXT (context); } if (!block) timeout = 0; g_main_context_poll (context, timeout, max_priority, fds, nfds); some_ready = g_main_context_check (context, max_priority, fds, nfds); if (dispatch) g_main_context_dispatch (context); #ifdef G_THREADS_ENABLED g_main_context_release (context); #endif /* G_THREADS_ENABLED */ LOCK_CONTEXT (context); return some_ready; } /** * g_main_context_pending: * @context: a #GMainContext (if %NULL, the default context will be used) * * Checks if any sources have pending events for the given context. * * Return value: %TRUE if events are pending. **/ gboolean g_main_context_pending (GMainContext *context) { gboolean retval; if (!context) context = g_main_context_default(); LOCK_CONTEXT (context); retval = g_main_context_iterate (context, FALSE, FALSE, G_THREAD_SELF); UNLOCK_CONTEXT (context); return retval; } /** * g_main_context_iteration: * @context: a #GMainContext (if %NULL, the default context will be used) * @may_block: whether the call may block. * * Runs a single iteration for the given main loop. This involves * checking to see if any event sources are ready to be processed, * then if no events sources are ready and @may_block is %TRUE, waiting * for a source to become ready, then dispatching the highest priority * events sources that are ready. Note that even when @may_block is %TRUE, * it is still possible for g_main_context_iteration() to return * %FALSE, since the the wait may be interrupted for other * reasons than an event source becoming ready. * * Return value: %TRUE if events were dispatched. **/ gboolean g_main_context_iteration (GMainContext *context, gboolean may_block) { gboolean retval; if (!context) context = g_main_context_default(); LOCK_CONTEXT (context); retval = g_main_context_iterate (context, may_block, TRUE, G_THREAD_SELF); UNLOCK_CONTEXT (context); return retval; } /** * g_main_loop_new: * @context: a #GMainContext (if %NULL, the default context will be used). * @is_running: set to %TRUE to indicate that the loop is running. This * is not very important since calling g_main_loop_run() will set this to * %TRUE anyway. * * Creates a new #GMainLoop structure. * * Return value: a new #GMainLoop. **/ GMainLoop * g_main_loop_new (GMainContext *context, gboolean is_running) { GMainLoop *loop; if (!context) context = g_main_context_default(); g_main_context_ref (context); loop = g_new0 (GMainLoop, 1); loop->context = context; loop->is_running = is_running != FALSE; loop->ref_count = 1; return loop; } /** * g_main_loop_ref: * @loop: a #GMainLoop * * Increases the reference count on a #GMainLoop object by one. * * Return value: @loop **/ GMainLoop * g_main_loop_ref (GMainLoop *loop) { g_return_val_if_fail (loop != NULL, NULL); g_return_val_if_fail (g_atomic_int_get (&loop->ref_count) > 0, NULL); g_atomic_int_inc (&loop->ref_count); return loop; } /** * g_main_loop_unref: * @loop: a #GMainLoop * * Decreases the reference count on a #GMainLoop object by one. If * the result is zero, free the loop and free all associated memory. **/ void g_main_loop_unref (GMainLoop *loop) { g_return_if_fail (loop != NULL); g_return_if_fail (g_atomic_int_get (&loop->ref_count) > 0); if (!g_atomic_int_dec_and_test (&loop->ref_count)) return; g_main_context_unref (loop->context); g_free (loop); } /** * g_main_loop_run: * @loop: a #GMainLoop * * Runs a main loop until g_main_loop_quit() is called on the loop. * If this is called for the thread of the loop's #GMainContext, * it will process events from the loop, otherwise it will * simply wait. **/ void g_main_loop_run (GMainLoop *loop) { GThread *self = G_THREAD_SELF; g_return_if_fail (loop != NULL); g_return_if_fail (g_atomic_int_get (&loop->ref_count) > 0); #ifdef G_THREADS_ENABLED if (!g_main_context_acquire (loop->context)) { gboolean got_ownership = FALSE; /* Another thread owns this context */ if (!g_thread_supported ()) { g_warning ("g_main_loop_run() was called from second thread but " "g_thread_init() was never called."); return; } LOCK_CONTEXT (loop->context); g_atomic_int_inc (&loop->ref_count); if (!loop->is_running) loop->is_running = TRUE; if (!loop->context->cond) loop->context->cond = g_cond_new (); while (loop->is_running && !got_ownership) got_ownership = g_main_context_wait (loop->context, loop->context->cond, g_static_mutex_get_mutex (&loop->context->mutex)); if (!loop->is_running) { UNLOCK_CONTEXT (loop->context); if (got_ownership) g_main_context_release (loop->context); g_main_loop_unref (loop); return; } g_assert (got_ownership); } else LOCK_CONTEXT (loop->context); #endif /* G_THREADS_ENABLED */ if (loop->context->in_check_or_prepare) { g_warning ("g_main_loop_run(): called recursively from within a source's " "check() or prepare() member, iteration not possible."); return; } g_atomic_int_inc (&loop->ref_count); loop->is_running = TRUE; while (loop->is_running) g_main_context_iterate (loop->context, TRUE, TRUE, self); UNLOCK_CONTEXT (loop->context); #ifdef G_THREADS_ENABLED g_main_context_release (loop->context); #endif /* G_THREADS_ENABLED */ g_main_loop_unref (loop); } /** * g_main_loop_quit: * @loop: a #GMainLoop * * Stops a #GMainLoop from running. Any calls to g_main_loop_run() * for the loop will return. **/ void g_main_loop_quit (GMainLoop *loop) { g_return_if_fail (loop != NULL); g_return_if_fail (g_atomic_int_get (&loop->ref_count) > 0); LOCK_CONTEXT (loop->context); loop->is_running = FALSE; g_main_context_wakeup_unlocked (loop->context); #ifdef G_THREADS_ENABLED if (loop->context->cond) g_cond_broadcast (loop->context->cond); #endif /* G_THREADS_ENABLED */ UNLOCK_CONTEXT (loop->context); } /** * g_main_loop_is_running: * @loop: a #GMainLoop. * * Checks to see if the main loop is currently being run via g_main_loop_run(). * * Return value: %TRUE if the mainloop is currently being run. **/ gboolean g_main_loop_is_running (GMainLoop *loop) { g_return_val_if_fail (loop != NULL, FALSE); g_return_val_if_fail (g_atomic_int_get (&loop->ref_count) > 0, FALSE); return loop->is_running; } /** * g_main_loop_get_context: * @loop: a #GMainLoop. * * Returns the #GMainContext of @loop. * * Return value: the #GMainContext of @loop **/ GMainContext * g_main_loop_get_context (GMainLoop *loop) { g_return_val_if_fail (loop != NULL, NULL); g_return_val_if_fail (g_atomic_int_get (&loop->ref_count) > 0, NULL); return loop->context; } /* HOLDS: context's lock */ static void g_main_context_poll (GMainContext *context, gint timeout, gint priority, GPollFD *fds, gint n_fds) { #ifdef G_MAIN_POLL_DEBUG GTimer *poll_timer; GPollRec *pollrec; gint i; #endif GPollFunc poll_func; if (n_fds || timeout != 0) { #ifdef G_MAIN_POLL_DEBUG g_print ("g_main_poll(%d) timeout: %d\n", n_fds, timeout); poll_timer = g_timer_new (); #endif LOCK_CONTEXT (context); poll_func = context->poll_func; UNLOCK_CONTEXT (context); if ((*poll_func) (fds, n_fds, timeout) < 0 && errno != EINTR) { #ifndef G_OS_WIN32 g_warning ("poll(2) failed due to: %s.", g_strerror (errno)); #else /* If g_poll () returns -1, it has already called g_warning() */ #endif } #ifdef G_MAIN_POLL_DEBUG LOCK_CONTEXT (context); g_print ("g_main_poll(%d) timeout: %d - elapsed %12.10f seconds", n_fds, timeout, g_timer_elapsed (poll_timer, NULL)); g_timer_destroy (poll_timer); pollrec = context->poll_records; i = 0; while (i < n_fds) { if (pollrec->fd->events) { if (fds[i].revents) { g_print (" [%d:", fds[i].fd); if (fds[i].revents & G_IO_IN) g_print ("i"); if (fds[i].revents & G_IO_OUT) g_print ("o"); if (fds[i].revents & G_IO_PRI) g_print ("p"); if (fds[i].revents & G_IO_ERR) g_print ("e"); if (fds[i].revents & G_IO_HUP) g_print ("h"); if (fds[i].revents & G_IO_NVAL) g_print ("n"); g_print ("]"); } i++; } pollrec = pollrec->next; } g_print ("\n"); UNLOCK_CONTEXT (context); #endif } /* if (n_fds || timeout != 0) */ } /** * g_main_context_add_poll: * @context: a #GMainContext (or %NULL for the default context) * @fd: a #GPollFD structure holding information about a file * descriptor to watch. * @priority: the priority for this file descriptor which should be * the same as the priority used for g_source_attach() to ensure that the * file descriptor is polled whenever the results may be needed. * * Adds a file descriptor to the set of file descriptors polled for * this context. This will very seldomly be used directly. Instead * a typical event source will use g_source_add_poll() instead. **/ void g_main_context_add_poll (GMainContext *context, GPollFD *fd, gint priority) { if (!context) context = g_main_context_default (); g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0); g_return_if_fail (fd); LOCK_CONTEXT (context); g_main_context_add_poll_unlocked (context, priority, fd); UNLOCK_CONTEXT (context); } /* HOLDS: main_loop_lock */ static void g_main_context_add_poll_unlocked (GMainContext *context, gint priority, GPollFD *fd) { GPollRec *lastrec, *pollrec; GPollRec *newrec = g_slice_new (GPollRec); /* This file descriptor may be checked before we ever poll */ fd->revents = 0; newrec->fd = fd; newrec->priority = priority; lastrec = NULL; pollrec = context->poll_records; while (pollrec && priority >= pollrec->priority) { lastrec = pollrec; pollrec = pollrec->next; } if (lastrec) lastrec->next = newrec; else context->poll_records = newrec; newrec->next = pollrec; context->n_poll_records++; #ifdef G_THREADS_ENABLED context->poll_changed = TRUE; /* Now wake up the main loop if it is waiting in the poll() */ g_main_context_wakeup_unlocked (context); #endif } /** * g_main_context_remove_poll: * @context:a #GMainContext * @fd: a #GPollFD descriptor previously added with g_main_context_add_poll() * * Removes file descriptor from the set of file descriptors to be * polled for a particular context. **/ void g_main_context_remove_poll (GMainContext *context, GPollFD *fd) { if (!context) context = g_main_context_default (); g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0); g_return_if_fail (fd); LOCK_CONTEXT (context); g_main_context_remove_poll_unlocked (context, fd); UNLOCK_CONTEXT (context); } static void g_main_context_remove_poll_unlocked (GMainContext *context, GPollFD *fd) { GPollRec *pollrec, *lastrec; lastrec = NULL; pollrec = context->poll_records; while (pollrec) { if (pollrec->fd == fd) { if (lastrec != NULL) lastrec->next = pollrec->next; else context->poll_records = pollrec->next; g_slice_free (GPollRec, pollrec); context->n_poll_records--; break; } lastrec = pollrec; pollrec = pollrec->next; } #ifdef G_THREADS_ENABLED context->poll_changed = TRUE; /* Now wake up the main loop if it is waiting in the poll() */ g_main_context_wakeup_unlocked (context); #endif } /** * g_source_get_current_time: * @source: a #GSource * @timeval: #GTimeVal structure in which to store current time. * * Gets the "current time" to be used when checking * this source. The advantage of calling this function over * calling g_get_current_time() directly is that when * checking multiple sources, GLib can cache a single value * instead of having to repeatedly get the system time. **/ void g_source_get_current_time (GSource *source, GTimeVal *timeval) { GMainContext *context; g_return_if_fail (source->context != NULL); context = source->context; LOCK_CONTEXT (context); if (!context->time_is_current) { g_get_current_time (&context->current_time); context->time_is_current = TRUE; } *timeval = context->current_time; UNLOCK_CONTEXT (context); } /** * g_main_context_set_poll_func: * @context: a #GMainContext * @func: the function to call to poll all file descriptors * * Sets the function to use to handle polling of file descriptors. It * will be used instead of the poll() system call * (or GLib's replacement function, which is used where * poll() isn't available). * * This function could possibly be used to integrate the GLib event * loop with an external event loop. **/ void g_main_context_set_poll_func (GMainContext *context, GPollFunc func) { if (!context) context = g_main_context_default (); g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0); LOCK_CONTEXT (context); if (func) context->poll_func = func; else { #ifdef HAVE_POLL context->poll_func = (GPollFunc) poll; #else context->poll_func = (GPollFunc) g_poll; #endif } UNLOCK_CONTEXT (context); } /** * g_main_context_get_poll_func: * @context: a #GMainContext * * Gets the poll function set by g_main_context_set_poll_func(). * * Return value: the poll function **/ GPollFunc g_main_context_get_poll_func (GMainContext *context) { GPollFunc result; if (!context) context = g_main_context_default (); g_return_val_if_fail (g_atomic_int_get (&context->ref_count) > 0, NULL); LOCK_CONTEXT (context); result = context->poll_func; UNLOCK_CONTEXT (context); return result; } /* HOLDS: context's lock */ /* Wake the main loop up from a poll() */ static void g_main_context_wakeup_unlocked (GMainContext *context) { #ifdef G_THREADS_ENABLED if (g_thread_supported() && context->poll_waiting) { context->poll_waiting = FALSE; #ifndef G_OS_WIN32 write (context->wake_up_pipe[1], "A", 1); #else ReleaseSemaphore (context->wake_up_semaphore, 1, NULL); #endif } #endif } /** * g_main_context_wakeup: * @context: a #GMainContext * * If @context is currently waiting in a poll(), interrupt * the poll(), and continue the iteration process. **/ void g_main_context_wakeup (GMainContext *context) { if (!context) context = g_main_context_default (); g_return_if_fail (g_atomic_int_get (&context->ref_count) > 0); LOCK_CONTEXT (context); g_main_context_wakeup_unlocked (context); UNLOCK_CONTEXT (context); } /** * g_main_context_is_owner: * @context: a #GMainContext * * Determines whether this thread holds the (recursive) * ownership of this #GMaincontext. This is useful to * know before waiting on another thread that may be * blocking to get ownership of @context. * * Returns: %TRUE if current thread is owner of @context. * * Since: 2.10 **/ gboolean g_main_context_is_owner (GMainContext *context) { gboolean is_owner; if (!context) context = g_main_context_default (); #ifdef G_THREADS_ENABLED LOCK_CONTEXT (context); is_owner = context->owner == G_THREAD_SELF; UNLOCK_CONTEXT (context); #else is_owner = TRUE; #endif return is_owner; } /* Timeouts */ static void g_timeout_set_expiration (GTimeoutSource *timeout_source, GTimeVal *current_time) { guint seconds = timeout_source->interval / 1000; guint msecs = timeout_source->interval - seconds * 1000; timeout_source->expiration.tv_sec = current_time->tv_sec + seconds; timeout_source->expiration.tv_usec = current_time->tv_usec + msecs * 1000; if (timeout_source->expiration.tv_usec >= 1000000) { timeout_source->expiration.tv_usec -= 1000000; timeout_source->expiration.tv_sec++; } } static gboolean g_timeout_prepare (GSource *source, gint *timeout) { glong sec; glong msec; GTimeVal current_time; GTimeoutSource *timeout_source = (GTimeoutSource *)source; g_source_get_current_time (source, ¤t_time); sec = timeout_source->expiration.tv_sec - current_time.tv_sec; msec = (timeout_source->expiration.tv_usec - current_time.tv_usec) / 1000; /* We do the following in a rather convoluted fashion to deal with * the fact that we don't have an integral type big enough to hold * the difference of two timevals in millseconds. */ if (sec < 0 || (sec == 0 && msec < 0)) msec = 0; else { glong interval_sec = timeout_source->interval / 1000; glong interval_msec = timeout_source->interval % 1000; if (msec < 0) { msec += 1000; sec -= 1; } if (sec > interval_sec || (sec == interval_sec && msec > interval_msec)) { /* The system time has been set backwards, so we * reset the expiration time to now + timeout_source->interval; * this at least avoids hanging for long periods of time. */ g_timeout_set_expiration (timeout_source, ¤t_time); msec = MIN (G_MAXINT, timeout_source->interval); } else { msec = MIN (G_MAXINT, (guint)msec + 1000 * (guint)sec); } } *timeout = (gint)msec; return msec == 0; } static gboolean g_timeout_check (GSource *source) { GTimeVal current_time; GTimeoutSource *timeout_source = (GTimeoutSource *)source; g_source_get_current_time (source, ¤t_time); return ((timeout_source->expiration.tv_sec < current_time.tv_sec) || ((timeout_source->expiration.tv_sec == current_time.tv_sec) && (timeout_source->expiration.tv_usec <= current_time.tv_usec))); } static gboolean g_timeout_dispatch (GSource *source, GSourceFunc callback, gpointer user_data) { GTimeoutSource *timeout_source = (GTimeoutSource *)source; if (!callback) { g_warning ("Timeout source dispatched without callback\n" "You must call g_source_set_callback()."); return FALSE; } if (callback (user_data)) { GTimeVal current_time; g_source_get_current_time (source, ¤t_time); g_timeout_set_expiration (timeout_source, ¤t_time); return TRUE; } else return FALSE; } /** * g_timeout_source_new: * @interval: the timeout interval in milliseconds. * * Creates a new timeout source. * * The source will not initially be associated with any #GMainContext * and must be added to one with g_source_attach() before it will be * executed. * * Return value: the newly-created timeout source **/ GSource * g_timeout_source_new (guint interval) { GSource *source = g_source_new (&g_timeout_funcs, sizeof (GTimeoutSource)); GTimeoutSource *timeout_source = (GTimeoutSource *)source; GTimeVal current_time; timeout_source->interval = interval; g_get_current_time (¤t_time); g_timeout_set_expiration (timeout_source, ¤t_time); return source; } /** * g_timeout_add_full: * @priority: the priority of the idle source. Typically this will be in the * range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE. * @interval: the time between calls to the function, in milliseconds * (1/1000ths of a second) * @function: function to call * @data: data to pass to @function * @notify: function to call when the idle is removed, or %NULL * * Sets a function to be called at regular intervals, with the given * priority. The function is called repeatedly until it returns * %FALSE, at which point the timeout is automatically destroyed and * the function will not be called again. The @notify function is * called when the timeout is destroyed. The first call to the * function will be at the end of the first @interval. * * Note that timeout functions may be delayed, due to the processing of other * event sources. Thus they should not be relied on for precise timing. * After each call to the timeout function, the time of the next * timeout is recalculated based on the current time and the given interval * (it does not try to 'catch up' time lost in delays). * * Return value: the ID (greater than 0) of the event source. **/ guint g_timeout_add_full (gint priority, guint interval, GSourceFunc function, gpointer data, GDestroyNotify notify) { GSource *source; guint id; g_return_val_if_fail (function != NULL, 0); source = g_timeout_source_new (interval); if (priority != G_PRIORITY_DEFAULT) g_source_set_priority (source, priority); g_source_set_callback (source, function, data, notify); id = g_source_attach (source, NULL); g_source_unref (source); return id; } /** * g_timeout_add: * @interval: the time between calls to the function, in milliseconds * (1/1000ths of a second) * @function: function to call * @data: data to pass to @function * * Sets a function to be called at regular intervals, with the default * priority, #G_PRIORITY_DEFAULT. The function is called repeatedly * until it returns %FALSE, at which point the timeout is automatically * destroyed and the function will not be called again. The first call * to the function will be at the end of the first @interval. * * Note that timeout functions may be delayed, due to the processing of other * event sources. Thus they should not be relied on for precise timing. * After each call to the timeout function, the time of the next * timeout is recalculated based on the current time and the given interval * (it does not try to 'catch up' time lost in delays). * * Return value: the ID (greater than 0) of the event source. **/ guint g_timeout_add (guint32 interval, GSourceFunc function, gpointer data) { return g_timeout_add_full (G_PRIORITY_DEFAULT, interval, function, data, NULL); } /* Child watch functions */ #ifdef G_OS_WIN32 static gboolean g_child_watch_prepare (GSource *source, gint *timeout) { *timeout = -1; return FALSE; } static gboolean g_child_watch_check (GSource *source) { GChildWatchSource *child_watch_source; gboolean child_exited; child_watch_source = (GChildWatchSource *) source; child_exited = child_watch_source->poll.revents & G_IO_IN; if (child_exited) { DWORD child_status; /* * Note: We do _not_ check for the special value of STILL_ACTIVE * since we know that the process has exited and doing so runs into * problems if the child process "happens to return STILL_ACTIVE(259)" * as Microsoft's Platform SDK puts it. */ if (!GetExitCodeProcess (child_watch_source->pid, &child_status)) { gchar *emsg = g_win32_error_message (GetLastError ()); g_warning (G_STRLOC ": GetExitCodeProcess() failed: %s", emsg); g_free (emsg); child_watch_source->child_status = -1; } else child_watch_source->child_status = child_status; } return child_exited; } #else /* G_OS_WIN32 */ static gboolean check_for_child_exited (GSource *source) { GChildWatchSource *child_watch_source; gint count; /* protect against another SIGCHLD in the middle of this call */ count = child_watch_count; child_watch_source = (GChildWatchSource *) source; if (child_watch_source->child_exited) return TRUE; if (child_watch_source->count < count) { gint child_status; if (waitpid (child_watch_source->pid, &child_status, WNOHANG) > 0) { child_watch_source->child_status = child_status; child_watch_source->child_exited = TRUE; } child_watch_source->count = count; } return child_watch_source->child_exited; } static gboolean g_child_watch_prepare (GSource *source, gint *timeout) { *timeout = -1; return check_for_child_exited (source); } static gboolean g_child_watch_check (GSource *source) { return check_for_child_exited (source); } #endif /* G_OS_WIN32 */ static gboolean g_child_watch_dispatch (GSource *source, GSourceFunc callback, gpointer user_data) { GChildWatchSource *child_watch_source; GChildWatchFunc child_watch_callback = (GChildWatchFunc) callback; child_watch_source = (GChildWatchSource *) source; if (!callback) { g_warning ("Child watch source dispatched without callback\n" "You must call g_source_set_callback()."); return FALSE; } (child_watch_callback) (child_watch_source->pid, child_watch_source->child_status, user_data); /* We never keep a child watch source around as the child is gone */ return FALSE; } #ifndef G_OS_WIN32 static void g_child_watch_signal_handler (int signum) { child_watch_count ++; if (child_watch_init_state == CHILD_WATCH_INITIALIZED_THREADED) { write (child_watch_wake_up_pipe[1], "B", 1); } else { /* We count on the signal interrupting the poll in the same thread. */ } } static void g_child_watch_source_init_single (void) { struct sigaction action; g_assert (! g_thread_supported()); g_assert (child_watch_init_state == CHILD_WATCH_UNINITIALIZED); child_watch_init_state = CHILD_WATCH_INITIALIZED_SINGLE; action.sa_handler = g_child_watch_signal_handler; sigemptyset (&action.sa_mask); action.sa_flags = SA_NOCLDSTOP; sigaction (SIGCHLD, &action, NULL); } static gpointer child_watch_helper_thread (gpointer data) { while (1) { gchar b[20]; GSList *list; read (child_watch_wake_up_pipe[0], b, 20); /* We were woken up. Wake up all other contexts in all other threads */ G_LOCK (main_context_list); for (list = main_context_list; list; list = list->next) { GMainContext *context; context = list->data; if (g_atomic_int_get (&context->ref_count) > 0) /* Due to racing conditions we can find ref_count == 0, in * that case, however, the context is still not destroyed * and no poll can be active, otherwise the ref_count * wouldn't be 0 */ g_main_context_wakeup (context); } G_UNLOCK (main_context_list); } } static void g_child_watch_source_init_multi_threaded (void) { GError *error = NULL; struct sigaction action; g_assert (g_thread_supported()); if (pipe (child_watch_wake_up_pipe) < 0) g_error ("Cannot create wake up pipe: %s\n", g_strerror (errno)); fcntl (child_watch_wake_up_pipe[1], F_SETFL, O_NONBLOCK | fcntl (child_watch_wake_up_pipe[1], F_GETFL)); /* We create a helper thread that polls on the wakeup pipe indefinitely */ /* FIXME: Think this through for races */ if (g_thread_create (child_watch_helper_thread, NULL, FALSE, &error) == NULL) g_error ("Cannot create a thread to monitor child exit status: %s\n", error->message); child_watch_init_state = CHILD_WATCH_INITIALIZED_THREADED; action.sa_handler = g_child_watch_signal_handler; sigemptyset (&action.sa_mask); action.sa_flags = SA_RESTART | SA_NOCLDSTOP; sigaction (SIGCHLD, &action, NULL); } static void g_child_watch_source_init_promote_single_to_threaded (void) { g_child_watch_source_init_multi_threaded (); } static void g_child_watch_source_init (void) { if (g_thread_supported()) { if (child_watch_init_state == CHILD_WATCH_UNINITIALIZED) g_child_watch_source_init_multi_threaded (); else if (child_watch_init_state == CHILD_WATCH_INITIALIZED_SINGLE) g_child_watch_source_init_promote_single_to_threaded (); } else { if (child_watch_init_state == CHILD_WATCH_UNINITIALIZED) g_child_watch_source_init_single (); } } #endif /* !G_OS_WIN32 */ /** * g_child_watch_source_new: * @pid: process id of a child process to watch. On Windows, a HANDLE * for the process to watch (which actually doesn't have to be a child). * * Creates a new child_watch source. * * The source will not initially be associated with any #GMainContext * and must be added to one with g_source_attach() before it will be * executed. * * Note that child watch sources can only be used in conjunction with * g_spawn... when the %G_SPAWN_DO_NOT_REAP_CHILD * flag is used. * * Note that on platforms where #GPid must be explicitely closed * (see g_spawn_close_pid()) @pid must not be closed while the * source is still active. Typically, you will want to call * g_spawn_close_pid() in the callback function for the source. * * Note further that using g_child_watch_source_new() is not * compatible with calling waitpid(-1) in * the application. Calling waitpid() for individual pids will * still work fine. * * Return value: the newly-created child watch source * * Since: 2.4 **/ GSource * g_child_watch_source_new (GPid pid) { GSource *source = g_source_new (&g_child_watch_funcs, sizeof (GChildWatchSource)); GChildWatchSource *child_watch_source = (GChildWatchSource *)source; #ifdef G_OS_WIN32 child_watch_source->poll.fd = (int)pid; child_watch_source->poll.events = G_IO_IN; g_source_add_poll (source, &child_watch_source->poll); #else /* G_OS_WIN32 */ g_child_watch_source_init (); #endif /* G_OS_WIN32 */ child_watch_source->pid = pid; return source; } /** * g_child_watch_add_full: * @priority: the priority of the idle source. Typically this will be in the * range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE. * @pid: process id of a child process to watch * @function: function to call * @data: data to pass to @function * @notify: function to call when the idle is removed, or %NULL * * Sets a function to be called when the child indicated by @pid exits, at a * default priority, #G_PRIORITY_DEFAULT. * * Note that on platforms where #GPid must be explicitely closed * (see g_spawn_close_pid()) @pid must not be closed while the * source is still active. Typically, you will want to call * g_spawn_close_pid() in the callback function for the source. * * GLib supports only a single callback per process id. * * Return value: the ID (greater than 0) of the event source. * * Since: 2.4 **/ guint g_child_watch_add_full (gint priority, GPid pid, GChildWatchFunc function, gpointer data, GDestroyNotify notify) { GSource *source; guint id; g_return_val_if_fail (function != NULL, 0); source = g_child_watch_source_new (pid); if (priority != G_PRIORITY_DEFAULT) g_source_set_priority (source, priority); g_source_set_callback (source, (GSourceFunc) function, data, notify); id = g_source_attach (source, NULL); g_source_unref (source); return id; } /** * g_child_watch_add: * @pid: process id of a child process to watch * @function: function to call * @data: data to pass to @function * * Sets a function to be called when the child indicated by @pid exits, at a * default priority, #G_PRIORITY_DEFAULT. * * Note that on platforms where #GPid must be explicitely closed * (see g_spawn_close_pid()) @pid must not be closed while the * source is still active. Typically, you will want to call * g_spawn_close_pid() in the callback function for the source. * * GLib supports only a single callback per process id. * * Return value: the ID (greater than 0) of the event source. * * Since: 2.4 **/ guint g_child_watch_add (GPid pid, GChildWatchFunc function, gpointer data) { return g_child_watch_add_full (G_PRIORITY_DEFAULT, pid, function, data, NULL); } /* Idle functions */ static gboolean g_idle_prepare (GSource *source, gint *timeout) { *timeout = 0; return TRUE; } static gboolean g_idle_check (GSource *source) { return TRUE; } static gboolean g_idle_dispatch (GSource *source, GSourceFunc callback, gpointer user_data) { if (!callback) { g_warning ("Idle source dispatched without callback\n" "You must call g_source_set_callback()."); return FALSE; } return callback (user_data); } /** * g_idle_source_new: * * Creates a new idle source. * * The source will not initially be associated with any #GMainContext * and must be added to one with g_source_attach() before it will be * executed. Note that the default priority for idle sources is * %G_PRIORITY_DEFAULT_IDLE, as compared to other sources which * have a default priority of %G_PRIORITY_DEFAULT. * * Return value: the newly-created idle source **/ GSource * g_idle_source_new (void) { GSource *source; source = g_source_new (&g_idle_funcs, sizeof (GSource)); g_source_set_priority (source, G_PRIORITY_DEFAULT_IDLE); return source; } /** * g_idle_add_full: * @priority: the priority of the idle source. Typically this will be in the * range btweeen #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE. * @function: function to call * @data: data to pass to @function * @notify: function to call when the idle is removed, or %NULL * * Adds a function to be called whenever there are no higher priority * events pending. If the function returns %FALSE it is automatically * removed from the list of event sources and will not be called again. * * Return value: the ID (greater than 0) of the event source. **/ guint g_idle_add_full (gint priority, GSourceFunc function, gpointer data, GDestroyNotify notify) { GSource *source; guint id; g_return_val_if_fail (function != NULL, 0); source = g_idle_source_new (); if (priority != G_PRIORITY_DEFAULT_IDLE) g_source_set_priority (source, priority); g_source_set_callback (source, function, data, notify); id = g_source_attach (source, NULL); g_source_unref (source); return id; } /** * g_idle_add: * @function: function to call * @data: data to pass to @function. * * Adds a function to be called whenever there are no higher priority * events pending to the default main loop. The function is given the * default idle priority, #G_PRIORITY_DEFAULT_IDLE. If the function * returns %FALSE it is automatically removed from the list of event * sources and will not be called again. * * Return value: the ID (greater than 0) of the event source. **/ guint g_idle_add (GSourceFunc function, gpointer data) { return g_idle_add_full (G_PRIORITY_DEFAULT_IDLE, function, data, NULL); } /** * g_idle_remove_by_data: * @data: the data for the idle source's callback. * * Removes the idle function with the given data. * * Return value: %TRUE if an idle source was found and removed. **/ gboolean g_idle_remove_by_data (gpointer data) { return g_source_remove_by_funcs_user_data (&g_idle_funcs, data); } #define __G_MAIN_C__ #include "galiasdef.c"