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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2000 Red Hat, Inc.
*
* 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.
*/
#ifndef __G_CLOSURE_H__
#define __G_CLOSURE_H__
#include <gobject/gtype.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* --- defines --- */
#define G_CLOSURE_NEEDS_MARSHAL(closure) (((GClosure*) (closure))->marshal == NULL)
#define G_CCLOSURE_SWAP_DATA(cclosure) (((GClosure*) (closure))->derivative_flag)
/* -- typedefs --- */
typedef struct _GClosure GClosure;
typedef struct _GClosureNotifyData GClosureNotifyData;
typedef gpointer GCallback;
typedef void (*GClosureNotify) (gpointer data,
GClosure *closure);
typedef void (*GClosureMarshal) (GClosure *closure,
GValue *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);
typedef struct _GCClosure GCClosure;
/* --- structures --- */
struct _GClosureNotifyData
{
gpointer data;
GClosureNotify notify;
};
struct _GClosure
{
/*< private >*/ guint ref_count : 15;
/*< private >*/ guint meta_marshal : 1;
/*< private >*/ guint n_guards : 1;
/*< private >*/ guint n_fnotifiers : 2; /* finalization notifiers */
/*< private >*/ guint n_inotifiers : 8; /* invalidation notifiers */
/*< private >*/ guint in_inotify : 1;
/*< private >*/ guint floating : 1;
/*< protected >*/ guint derivative_flag : 1;
/*< puplic >*/ guint in_marshal : 1;
/*< public >*/ guint is_invalid : 1;
/*< private >*/ void (*marshal) (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);
/*< protected >*/ gpointer data;
/*< private >*/ GClosureNotifyData *notifiers;
/* invariants/constrains:
* - ->marshal and ->data are _invalid_ as soon as ->is_invalid==TRUE
* - invocation of all inotifiers occours prior to fnotifiers
* - order of inotifiers is random
* inotifiers may _not_ free/invalidate parameter values (e.g. ->data)
* - order of fnotifiers is random
* - notifiers may only be removed before or during their invocation
* - reference counting may only happen prior to fnotify invocation
* (in that sense, fnotifiers are really finalization handlers)
*/
};
/* closure for C function calls, callback() is the user function
*/
struct _GCClosure
{
GClosure closure;
gpointer callback;
};
/* --- prototypes --- */
GClosure* g_cclosure_new (GCallback callback_func,
gpointer user_data,
GClosureNotify destroy_data);
GClosure* g_cclosure_new_swap (GCallback callback_func,
gpointer user_data,
GClosureNotify destroy_data);
GClosure* g_signal_type_closure_new (GType itype,
guint struct_offset);
/* --- prototypes --- */
GClosure* g_closure_ref (GClosure *closure);
void g_closure_unref (GClosure *closure);
/* intimidating */
GClosure* g_closure_new_simple (guint sizeof_closure,
gpointer data);
void g_closure_add_fnotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func);
void g_closure_remove_fnotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func);
void g_closure_add_inotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func);
void g_closure_remove_inotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func);
void g_closure_add_marshal_guards (GClosure *closure,
gpointer pre_marshal_data,
GClosureNotify pre_marshal_notify,
gpointer post_marshal_data,
GClosureNotify post_marshal_notify);
void g_closure_set_marshal (GClosure *closure,
GClosureMarshal marshal);
void g_closure_set_meta_marshal (GClosure *closure,
gpointer marshal_data,
GClosureMarshal meta_marshal);
void g_closure_invalidate (GClosure *closure);
void g_closure_invoke (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint);
/* FIXME:
data_object::destroy -> closure_invalidate();
closure_invalidate() -> disconnect(closure);
disconnect(closure) -> (unlink) closure_unref();
closure_finalize() -> g_free (data_string);
1) need GObject and GType in glib
2) need GParam
3) need to resolve dtor cycles
4) need GSignal move
5) destroy on last caller ref or last data ref?
random remarks:
- don't mandate signals for GObject
- OTOH, don't mandate GObject for GSignal
- need marshaller repo with decent aliasing to base types
- provide marshaller collection, virtually covering anything out there
- at that point, still need GSignalCMarhsaller to g_signal_new() ?
- can we combine varargs collect mechanisms with marshaller stubs?
for out values (i.e. returntypes), that might get rid of the following
point...
- char* return signals with connections ala:
connect({ return "static data that can't work"; }),
connect({ return g_strdup ("properly duplicated string"); })
won't work anymore. CRASH
problems:
- accumulator needs gboolean to indicate EMISSION_STOP
- accumulator needs data
*/
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __G_CLOSURE_H__ */
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