mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-11-05 17:06:18 +01:00
588af03a28
These closures support being invoked on a va_args which can be useful as you can then avoid boxing the va_args into GValues in certain cases. https://bugzilla.gnome.org/show_bug.cgi?id=661140
282 lines
9.6 KiB
C
282 lines
9.6 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
|
|
* Copyright (C) 2000-2001 Red Hat, Inc.
|
|
* Copyright (C) 2005 Imendio AB
|
|
*
|
|
* 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.
|
|
*/
|
|
#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
|
|
#error "Only <glib-object.h> can be included directly."
|
|
#endif
|
|
|
|
#ifndef __G_CLOSURE_H__
|
|
#define __G_CLOSURE_H__
|
|
|
|
#include <gobject/gtype.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
/* --- defines --- */
|
|
/**
|
|
* G_CLOSURE_NEEDS_MARSHAL:
|
|
* @closure: a #GClosure
|
|
*
|
|
* Check if the closure still needs a marshaller. See g_closure_set_marshal().
|
|
*
|
|
* Returns: %TRUE if a #GClosureMarshal marshaller has not yet been set on
|
|
* @closure.
|
|
*/
|
|
#define G_CLOSURE_NEEDS_MARSHAL(closure) (((GClosure*) (closure))->marshal == NULL)
|
|
/**
|
|
* G_CLOSURE_N_NOTIFIERS:
|
|
* @cl: a #GClosure
|
|
*
|
|
* Get the total number of notifiers connected with the closure @cl.
|
|
* The count includes the meta marshaller, the finalize and invalidate notifiers
|
|
* and the marshal guards. Note that each guard counts as two notifiers.
|
|
* See g_closure_set_meta_marshal(), g_closure_add_finalize_notifier(),
|
|
* g_closure_add_invalidate_notifier() and g_closure_add_marshal_guards().
|
|
*
|
|
* Returns: number of notifiers
|
|
*/
|
|
#define G_CLOSURE_N_NOTIFIERS(cl) (((cl)->n_guards << 1L) + \
|
|
(cl)->n_fnotifiers + (cl)->n_inotifiers)
|
|
/**
|
|
* G_CCLOSURE_SWAP_DATA:
|
|
* @cclosure: a #GCClosure
|
|
*
|
|
* Checks whether the user data of the #GCClosure should be passed as the
|
|
* first parameter to the callback. See g_cclosure_new_swap().
|
|
*
|
|
* Returns: %TRUE if data has to be swapped.
|
|
*/
|
|
#define G_CCLOSURE_SWAP_DATA(cclosure) (((GClosure*) (cclosure))->derivative_flag)
|
|
/**
|
|
* G_CALLBACK:
|
|
* @f: a function pointer.
|
|
*
|
|
* Cast a function pointer to a #GCallback.
|
|
*/
|
|
#define G_CALLBACK(f) ((GCallback) (f))
|
|
|
|
|
|
/* -- typedefs --- */
|
|
typedef struct _GClosure GClosure;
|
|
typedef struct _GClosureNotifyData GClosureNotifyData;
|
|
|
|
/**
|
|
* GCallback:
|
|
*
|
|
* The type used for callback functions in structure definitions and function
|
|
* signatures. This doesn't mean that all callback functions must take no
|
|
* parameters and return void. The required signature of a callback function
|
|
* is determined by the context in which is used (e.g. the signal to which it
|
|
* is connected). Use G_CALLBACK() to cast the callback function to a #GCallback.
|
|
*/
|
|
typedef void (*GCallback) (void);
|
|
/**
|
|
* GClosureNotify:
|
|
* @data: data specified when registering the notification callback
|
|
* @closure: the #GClosure on which the notification is emitted
|
|
*
|
|
* The type used for the various notification callbacks which can be registered
|
|
* on closures.
|
|
*/
|
|
typedef void (*GClosureNotify) (gpointer data,
|
|
GClosure *closure);
|
|
/**
|
|
* GClosureMarshal:
|
|
* @closure: the #GClosure to which the marshaller belongs
|
|
* @return_value: (allow-none): a #GValue to store the return
|
|
* value. May be %NULL if the callback of @closure doesn't return a
|
|
* value.
|
|
* @n_param_values: the length of the @param_values array
|
|
* @param_values: (array length=n_param_values): an array of
|
|
* #GValue<!-- -->s holding the arguments on which to invoke the
|
|
* callback of @closure
|
|
* @invocation_hint: (allow-none): the invocation hint given as the
|
|
* last argument to g_closure_invoke()
|
|
* @marshal_data: (allow-none): additional data specified when
|
|
* registering the marshaller, see g_closure_set_marshal() and
|
|
* g_closure_set_meta_marshal()
|
|
*
|
|
* The type used for marshaller functions.
|
|
*/
|
|
typedef void (*GClosureMarshal) (GClosure *closure,
|
|
GValue *return_value,
|
|
guint n_param_values,
|
|
const GValue *param_values,
|
|
gpointer invocation_hint,
|
|
gpointer marshal_data);
|
|
|
|
typedef void (* GVaClosureMarshal) (GClosure *closure,
|
|
GValue *return_value,
|
|
gpointer instance,
|
|
va_list args,
|
|
gpointer marshal_data,
|
|
int n_params,
|
|
GType *param_types);
|
|
|
|
/**
|
|
* GCClosure:
|
|
* @closure: the #GClosure
|
|
* @callback: the callback function
|
|
*
|
|
* A #GCClosure is a specialization of #GClosure for C function callbacks.
|
|
*/
|
|
typedef struct _GCClosure GCClosure;
|
|
|
|
|
|
/* --- structures --- */
|
|
struct _GClosureNotifyData
|
|
{
|
|
gpointer data;
|
|
GClosureNotify notify;
|
|
};
|
|
/**
|
|
* GClosure:
|
|
* @in_marshal: Indicates whether the closure is currently being invoked with
|
|
* g_closure_invoke()
|
|
* @is_invalid: Indicates whether the closure has been invalidated by
|
|
* g_closure_invalidate()
|
|
*
|
|
* A #GClosure represents a callback supplied by the programmer.
|
|
*/
|
|
struct _GClosure
|
|
{
|
|
/*< private >*/
|
|
volatile guint ref_count : 15;
|
|
/* meta_marshal is not used anymore but must be zero for historical reasons
|
|
as it was exposed in the G_CLOSURE_N_NOTIFIERS macro */
|
|
volatile guint meta_marshal_nouse : 1;
|
|
volatile guint n_guards : 1;
|
|
volatile guint n_fnotifiers : 2; /* finalization notifiers */
|
|
volatile guint n_inotifiers : 8; /* invalidation notifiers */
|
|
volatile guint in_inotify : 1;
|
|
volatile guint floating : 1;
|
|
/*< protected >*/
|
|
volatile guint derivative_flag : 1;
|
|
/*< public >*/
|
|
volatile guint in_marshal : 1;
|
|
volatile 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
|
|
* - each notifier may only be removed before or during its 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_cclosure_new (GType itype,
|
|
guint struct_offset);
|
|
|
|
|
|
/* --- prototypes --- */
|
|
GClosure* g_closure_ref (GClosure *closure);
|
|
void g_closure_sink (GClosure *closure);
|
|
void g_closure_unref (GClosure *closure);
|
|
/* intimidating */
|
|
GClosure* g_closure_new_simple (guint sizeof_closure,
|
|
gpointer data);
|
|
void g_closure_add_finalize_notifier (GClosure *closure,
|
|
gpointer notify_data,
|
|
GClosureNotify notify_func);
|
|
void g_closure_remove_finalize_notifier (GClosure *closure,
|
|
gpointer notify_data,
|
|
GClosureNotify notify_func);
|
|
void g_closure_add_invalidate_notifier (GClosure *closure,
|
|
gpointer notify_data,
|
|
GClosureNotify notify_func);
|
|
void g_closure_remove_invalidate_notifier (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:
|
|
OK: data_object::destroy -> closure_invalidate();
|
|
MIS: closure_invalidate() -> disconnect(closure);
|
|
MIS: disconnect(closure) -> (unlink) closure_unref();
|
|
OK: closure_finalize() -> g_free (data_string);
|
|
|
|
random remarks:
|
|
- need marshaller repo with decent aliasing to base types
|
|
- provide marshaller collection, virtually covering anything out there
|
|
*/
|
|
|
|
void g_cclosure_marshal_generic (GClosure *closure,
|
|
GValue *return_gvalue,
|
|
guint n_param_values,
|
|
const GValue *param_values,
|
|
gpointer invocation_hint,
|
|
gpointer marshal_data);
|
|
|
|
void g_cclosure_marshal_generic_va (GClosure *closure,
|
|
GValue *return_value,
|
|
gpointer instance,
|
|
va_list args_list,
|
|
gpointer marshal_data,
|
|
int n_params,
|
|
GType *param_types);
|
|
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __G_CLOSURE_H__ */
|