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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gthread.c: posix thread system implementation
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
/*
* MT safe
*/
#include <pthread.h>
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#define posix_print_error( name, num ) \
g_error( "file %s: line %d (%s): error %s during %s", \
__FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION, \
g_strerror((num)), #name )
#define posix_check_for_error( what ) G_STMT_START{ \
int error = (what); \
if( error ) { posix_print_error( what, error ); } \
}G_STMT_END
static GMutex *
g_mutex_new_posix_impl (void)
{
GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1);
posix_check_for_error (pthread_mutex_init ((pthread_mutex_t *) result, NULL));
return result;
}
static void
g_mutex_free_posix_impl (GMutex * mutex)
{
posix_check_for_error (pthread_mutex_destroy ((pthread_mutex_t *) mutex));
g_free (mutex);
}
/* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
functions from gmem.c and gmessages.c; */
/* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as
signature and semantic are right, but without error check then!!!!,
we might want to change this therefore. */
static gboolean
g_mutex_trylock_posix_impl (GMutex * mutex)
{
int result;
result = pthread_mutex_trylock ((pthread_mutex_t *) mutex);
if (result != EBUSY)
return FALSE;
posix_check_for_error (result);
return TRUE;
}
static GCond *
g_cond_new_posix_impl (void)
{
GCond *result = (GCond *) g_new (pthread_cond_t, 1);
posix_check_for_error (pthread_cond_init ((pthread_cond_t *) result, NULL));
return result;
}
/* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait
can be taken directly, as signature and semantic are right, but
without error check then!!!!, we might want to change this
therfore. */
#define G_MICROSEC 1000000
#define G_NANOSEC 1000000000
static gboolean
g_cond_timed_wait_posix_impl (GCond * cond,
GMutex * entered_mutex,
GTimeVal * abs_time)
{
int result;
struct timespec end_time;
gboolean timed_out;
g_return_val_if_fail (cond != NULL, FALSE);
g_return_val_if_fail (entered_mutex != NULL, FALSE);
if (!abs_time)
{
g_cond_wait (cond, entered_mutex);
return TRUE;
}
end_time.tv_sec = abs_time->tv_sec;
end_time.tv_nsec = abs_time->tv_usec * (G_NANOSEC / G_MICROSEC);
g_assert (end_time.tv_nsec < G_NANOSEC);
result = pthread_cond_timedwait ((pthread_cond_t *) cond,
(pthread_mutex_t *) entered_mutex,
&end_time);
timed_out = (result == ETIMEDOUT);
if (!timed_out)
posix_check_for_error (result);
return !timed_out;
}
static void
g_cond_free_posix_impl (GCond * cond)
{
posix_check_for_error (pthread_cond_destroy ((pthread_cond_t *) cond));
g_free (cond);
}
static GPrivate *
g_private_new_posix_impl (GDestroyNotify destructor)
{
GPrivate *result = (GPrivate *) g_new (pthread_key_t, 1);
posix_check_for_error (pthread_key_create ((pthread_key_t *) result,
destructor));
return result;
}
/* NOTE: the functions g_private_get and g_private_set may not use
functions from gmem.c and gmessages.c */
static void
g_private_set_posix_impl (GPrivate * private_key, gpointer value)
{
if (!private_key)
return;
pthread_setspecific (*(pthread_key_t *) private_key, value);
}
static gpointer
g_private_get_posix_impl (GPrivate * private_key)
{
if (!private_key)
return NULL;
#ifdef HAVE_PTHREAD_GETSPECIFIC_POSIX
return pthread_getspecific (*(pthread_key_t *) private_key);
#else /* HAVE_PTHREAD_GETSPECIFIC_POSIX */
{
void* data;
pthread_getspecific (*(pthread_key_t *) private_key, &data);
return data;
}
#endif /* HAVE_PTHREAD_GETSPECIFIC_POSIX */
}
static GThreadFunctions g_thread_functions_for_glib_use_default =
{
g_mutex_new_posix_impl,
(void (*)(GMutex *)) pthread_mutex_lock,
g_mutex_trylock_posix_impl,
(void (*)(GMutex *)) pthread_mutex_unlock,
g_mutex_free_posix_impl,
g_cond_new_posix_impl,
(void (*)(GCond *)) pthread_cond_signal,
(void (*)(GCond *)) pthread_cond_broadcast,
(void (*)(GCond *, GMutex *)) pthread_cond_wait,
g_cond_timed_wait_posix_impl,
g_cond_free_posix_impl,
g_private_new_posix_impl,
g_private_get_posix_impl,
g_private_set_posix_impl
};
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