/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2000-2001 Red Hat, Inc.
* Copyright (C) 2005 Imendio AB
* Portions copyright (c) 2006-2009 Nokia Corporation. All rights reserved.
*
* 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.
*/
/*
* MT safe with regards to reference counting.
*/
#include "config.h"
#include <string.h>
#include "gclosure.h"
#include "gvalue.h"
#include "gobjectalias.h"
/**
* SECTION:gclosure
* @short_description: Functions as first-class objects
* @title: Closures
*
* A #GClosure represents a callback supplied by the programmer. It
* will generally comprise a function of some kind and a marshaller
* used to call it. It is the reponsibility of the marshaller to
* convert the arguments for the invocation from #GValue<!-- -->s into
* a suitable form, perform the callback on the converted arguments,
* and transform the return value back into a #GValue.
*
* In the case of C programs, a closure usually just holds a pointer
* to a function and maybe a data argument, and the marshaller
* converts between #GValue<!-- --> and native C types. The GObject
* library provides the #GCClosure type for this purpose. Bindings for
* other languages need marshallers which convert between #GValue<!--
* -->s and suitable representations in the runtime of the language in
* order to use functions written in that languages as callbacks.
*
* Within GObject, closures play an important role in the
* implementation of signals. When a signal is registered, the
* @c_marshaller argument to g_signal_new() specifies the default C
* marshaller for any closure which is connected to this
* signal. GObject provides a number of C marshallers for this
* purpose, see the g_cclosure_marshal_*() functions. Additional C
* marshallers can be generated with the <link
* linkend="glib-genmarshal">glib-genmarshal</link> utility. Closures
* can be explicitly connected to signals with
* g_signal_connect_closure(), but it usually more convenient to let
* GObject create a closure automatically by using one of the
* g_signal_connect_*() functions which take a callback function/user
* data pair.
*
* Using closures has a number of important advantages over a simple
* callback function/data pointer combination:
* <itemizedlist>
* <listitem><para>
* Closures allow the callee to get the types of the callback parameters,
* which means that language bindings don't have to write individual glue
* for each callback type.
* </para></listitem>
* <listitem><para>
* The reference counting of #GClosure makes it easy to handle reentrancy
* right; if a callback is removed while it is being invoked, the closure
* and its parameters won't be freed until the invocation finishes.
* </para></listitem>
* <listitem><para>
* g_closure_invalidate() and invalidation notifiers allow callbacks to be
* automatically removed when the objects they point to go away.
* </para></listitem>
* </itemizedlist>
*/
#define CLOSURE_MAX_REF_COUNT ((1 << 15) - 1)
#define CLOSURE_MAX_N_GUARDS ((1 << 1) - 1)
#define CLOSURE_MAX_N_FNOTIFIERS ((1 << 2) - 1)
#define CLOSURE_MAX_N_INOTIFIERS ((1 << 8) - 1)
#define CLOSURE_N_MFUNCS(cl) ((cl)->meta_marshal + \
((cl)->n_guards << 1L))
/* same as G_CLOSURE_N_NOTIFIERS() (keep in sync) */
#define CLOSURE_N_NOTIFIERS(cl) (CLOSURE_N_MFUNCS (cl) + \
(cl)->n_fnotifiers + \
(cl)->n_inotifiers)
typedef union {
GClosure closure;
volatile gint vint;
} ClosureInt;
#define CHANGE_FIELD(_closure, _field, _OP, _value, _must_set, _SET_OLD, _SET_NEW) \
G_STMT_START { \
ClosureInt *cunion = (ClosureInt*) _closure; \
gint new_int, old_int, success; \
do \
{ \
ClosureInt tmp; \
tmp.vint = old_int = cunion->vint; \
_SET_OLD tmp.closure._field; \
tmp.closure._field _OP _value; \
_SET_NEW tmp.closure._field; \
new_int = tmp.vint; \
success = g_atomic_int_compare_and_exchange (&cunion->vint, old_int, new_int); \
} \
while (!success && _must_set); \
} G_STMT_END
#define SWAP(_closure, _field, _value, _oldv) CHANGE_FIELD (_closure, _field, =, _value, TRUE, *(_oldv) =, (void) )
#define SET(_closure, _field, _value) CHANGE_FIELD (_closure, _field, =, _value, TRUE, (void), (void) )
#define INC(_closure, _field) CHANGE_FIELD (_closure, _field, +=, 1, TRUE, (void), (void) )
#define INC_ASSIGN(_closure, _field, _newv) CHANGE_FIELD (_closure, _field, +=, 1, TRUE, (void), *(_newv) = )
#define DEC(_closure, _field) CHANGE_FIELD (_closure, _field, -=, 1, TRUE, (void), (void) )
#define DEC_ASSIGN(_closure, _field, _newv) CHANGE_FIELD (_closure, _field, -=, 1, TRUE, (void), *(_newv) = )
#if 0 /* for non-thread-safe closures */
#define SWAP(cl,f,v,o) (void) (*(o) = cl->f, cl->f = v)
#define SET(cl,f,v) (void) (cl->f = v)
#define INC(cl,f) (void) (cl->f += 1)
#define INC_ASSIGN(cl,f,n) (void) (cl->f += 1, *(n) = cl->f)
#define DEC(cl,f) (void) (cl->f -= 1)
#define DEC_ASSIGN(cl,f,n) (void) (cl->f -= 1, *(n) = cl->f)
#endif
enum {
FNOTIFY,
INOTIFY,
PRE_NOTIFY,
POST_NOTIFY
};
/* --- functions --- */
/**
* g_closure_new_simple:
* @sizeof_closure: the size of the structure to allocate, must be at least
* <literal>sizeof (GClosure)</literal>
* @data: data to store in the @data field of the newly allocated #GClosure
*
* Allocates a struct of the given size and initializes the initial
* part as a #GClosure. This function is mainly useful when
* implementing new types of closures.
*
* |[
* typedef struct _MyClosure MyClosure;
* struct _MyClosure
* {
* GClosure closure;
* // extra data goes here
* };
*
* static void
* my_closure_finalize (gpointer notify_data,
* GClosure *closure)
* {
* MyClosure *my_closure = (MyClosure *)closure;
*
* // free extra data here
* }
*
* MyClosure *my_closure_new (gpointer data)
* {
* GClosure *closure;
* MyClosure *my_closure;
*
* closure = g_closure_new_simple (sizeof (MyClosure), data);
* my_closure = (MyClosure *) closure;
*
* // initialize extra data here
*
* g_closure_add_finalize_notifier (closure, notify_data,
* my_closure_finalize);
* return my_closure;
* }
* ]|
*
* Returns: a newly allocated #GClosure
*/
EXPORT_C GClosure*
g_closure_new_simple (guint sizeof_closure,
gpointer data)
{
GClosure *closure;
g_return_val_if_fail (sizeof_closure >= sizeof (GClosure), NULL);
closure = g_malloc0 (sizeof_closure);
SET (closure, ref_count, 1);
SET (closure, meta_marshal, 0);
SET (closure, n_guards, 0);
SET (closure, n_fnotifiers, 0);
SET (closure, n_inotifiers, 0);
SET (closure, in_inotify, FALSE);
SET (closure, floating, TRUE);
SET (closure, derivative_flag, 0);
SET (closure, in_marshal, FALSE);
SET (closure, is_invalid, FALSE);
closure->marshal = NULL;
closure->data = data;
closure->notifiers = NULL;
memset (G_STRUCT_MEMBER_P (closure, sizeof (*closure)), 0, sizeof_closure - sizeof (*closure));
return closure;
}
static inline void
closure_invoke_notifiers (GClosure *closure,
guint notify_type)
{
/* notifier layout:
* meta_marshal n_guards n_guards n_fnotif. n_inotifiers
* ->[[meta_marshal][pre_guards][post_guards][fnotifiers][inotifiers]]
*
* CLOSURE_N_MFUNCS(cl) = meta_marshal + n_guards + n_guards;
* CLOSURE_N_NOTIFIERS(cl) = CLOSURE_N_MFUNCS(cl) + n_fnotifiers + n_inotifiers
*
* constrains/catches:
* - closure->notifiers may be reloacted during callback
* - closure->n_fnotifiers and closure->n_inotifiers may change during callback
* - i.e. callbacks can be removed/added during invocation
* - must prepare for callback removal during FNOTIFY and INOTIFY (done via ->marshal= & ->data=)
* - must distinguish (->marshal= & ->data=) for INOTIFY vs. FNOTIFY (via ->in_inotify)
* + closure->n_guards is const during PRE_NOTIFY & POST_NOTIFY
* + closure->meta_marshal is const for all cases
* + none of the callbacks can cause recursion
* + closure->n_inotifiers is const 0 during FNOTIFY
*/
switch (notify_type)
{
GClosureNotifyData *ndata;
guint i, offs;
case FNOTIFY:
while (closure->n_fnotifiers)
{
guint n;
DEC_ASSIGN (closure, n_fnotifiers, &n);
ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + n;
closure->marshal = (GClosureMarshal) ndata->notify;
closure->data = ndata->data;
ndata->notify (ndata->data, closure);
}
closure->marshal = NULL;
closure->data = NULL;
break;
case INOTIFY:
SET (closure, in_inotify, TRUE);
while (closure->n_inotifiers)
{
guint n;
DEC_ASSIGN (closure, n_inotifiers, &n);
ndata = closure->notifiers + CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + n;
closure->marshal = (GClosureMarshal) ndata->notify;
closure->data = ndata->data;
ndata->notify (ndata->data, closure);
}
closure->marshal = NULL;
closure->data = NULL;
SET (closure, in_inotify, FALSE);
break;
case PRE_NOTIFY:
i = closure->n_guards;
offs = closure->meta_marshal;
while (i--)
{
ndata = closure->notifiers + offs + i;
ndata->notify (ndata->data, closure);
}
break;
case POST_NOTIFY:
i = closure->n_guards;
offs = closure->meta_marshal + i;
while (i--)
{
ndata = closure->notifiers + offs + i;
ndata->notify (ndata->data, closure);
}
break;
}
}
/**
* g_closure_set_meta_marshal:
* @closure: a #GClosure
* @marshal_data: context-dependent data to pass to @meta_marshal
* @meta_marshal: a #GClosureMarshal function
*
* Sets the meta marshaller of @closure. A meta marshaller wraps
* @closure->marshal and modifies the way it is called in some
* fashion. The most common use of this facility is for C callbacks.
* The same marshallers (generated by <link
* linkend="glib-genmarshal">glib-genmarshal</link>) are used
* everywhere, but the way that we get the callback function
* differs. In most cases we want to use @closure->callback, but in
* other cases we want to use some different technique to retrieve the
* callback function.
*
* For example, class closures for signals (see
* g_signal_type_cclosure_new()) retrieve the callback function from a
* fixed offset in the class structure. The meta marshaller retrieves
* the right callback and passes it to the marshaller as the
* @marshal_data argument.
*/
EXPORT_C void
g_closure_set_meta_marshal (GClosure *closure,
gpointer marshal_data,
GClosureMarshal meta_marshal)
{
GClosureNotifyData *notifiers;
g_return_if_fail (closure != NULL);
g_return_if_fail (meta_marshal != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->in_marshal == FALSE);
g_return_if_fail (closure->meta_marshal == 0);
notifiers = closure->notifiers;
closure->notifiers = g_renew (GClosureNotifyData, NULL, CLOSURE_N_NOTIFIERS (closure) + 1);
if (notifiers)
{
/* usually the meta marshal will be setup right after creation, so the
* g_memmove() should be rare-case scenario
*/
g_memmove (closure->notifiers + 1, notifiers, CLOSURE_N_NOTIFIERS (closure) * sizeof (notifiers[0]));
g_free (notifiers);
}
closure->notifiers[0].data = marshal_data;
closure->notifiers[0].notify = (GClosureNotify) meta_marshal;
SET (closure, meta_marshal, 1);
}
/**
* g_closure_add_marshal_guards:
* @closure: a #GClosure
* @pre_marshal_data: data to pass to @pre_marshal_notify
* @pre_marshal_notify: a function to call before the closure callback
* @post_marshal_data: data to pass to @post_marshal_notify
* @post_marshal_notify: a function to call after the closure callback
*
* Adds a pair of notifiers which get invoked before and after the
* closure callback, respectively. This is typically used to protect
* the extra arguments for the duration of the callback. See
* g_object_watch_closure() for an example of marshal guards.
*/
EXPORT_C void
g_closure_add_marshal_guards (GClosure *closure,
gpointer pre_marshal_data,
GClosureNotify pre_marshal_notify,
gpointer post_marshal_data,
GClosureNotify post_marshal_notify)
{
guint i;
g_return_if_fail (closure != NULL);
g_return_if_fail (pre_marshal_notify != NULL);
g_return_if_fail (post_marshal_notify != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->in_marshal == FALSE);
g_return_if_fail (closure->n_guards < CLOSURE_MAX_N_GUARDS);
closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 2);
if (closure->n_inotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers + 1)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 0)];
if (closure->n_inotifiers > 1)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 1)];
if (closure->n_fnotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 1)] = closure->notifiers[CLOSURE_N_MFUNCS (closure) + 0];
if (closure->n_fnotifiers > 1)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers)] = closure->notifiers[CLOSURE_N_MFUNCS (closure) + 1];
if (closure->n_guards)
closure->notifiers[(closure->meta_marshal +
closure->n_guards +
closure->n_guards + 1)] = closure->notifiers[closure->meta_marshal + closure->n_guards];
i = closure->n_guards;
closure->notifiers[closure->meta_marshal + i].data = pre_marshal_data;
closure->notifiers[closure->meta_marshal + i].notify = pre_marshal_notify;
closure->notifiers[closure->meta_marshal + i + 1].data = post_marshal_data;
closure->notifiers[closure->meta_marshal + i + 1].notify = post_marshal_notify;
INC (closure, n_guards);
}
/**
* g_closure_add_finalize_notifier:
* @closure: a #GClosure
* @notify_data: data to pass to @notify_func
* @notify_func: the callback function to register
*
* Registers a finalization notifier which will be called when the
* reference count of @closure goes down to 0. Multiple finalization
* notifiers on a single closure are invoked in unspecified order. If
* a single call to g_closure_unref() results in the closure being
* both invalidated and finalized, then the invalidate notifiers will
* be run before the finalize notifiers.
*/
EXPORT_C void
g_closure_add_finalize_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
guint i;
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
g_return_if_fail (closure->n_fnotifiers < CLOSURE_MAX_N_FNOTIFIERS);
closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 1);
if (closure->n_inotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers + 0)];
i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers;
closure->notifiers[i].data = notify_data;
closure->notifiers[i].notify = notify_func;
INC (closure, n_fnotifiers);
}
/**
* g_closure_add_invalidate_notifier:
* @closure: a #GClosure
* @notify_data: data to pass to @notify_func
* @notify_func: the callback function to register
*
* Registers an invalidation notifier which will be called when the
* @closure is invalidated with g_closure_invalidate(). Invalidation
* notifiers are invoked before finalization notifiers, in an
* unspecified order.
*/
EXPORT_C void
g_closure_add_invalidate_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
guint i;
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
g_return_if_fail (closure->is_invalid == FALSE);
g_return_if_fail (closure->n_inotifiers < CLOSURE_MAX_N_INOTIFIERS);
closure->notifiers = g_renew (GClosureNotifyData, closure->notifiers, CLOSURE_N_NOTIFIERS (closure) + 1);
i = CLOSURE_N_MFUNCS (closure) + closure->n_fnotifiers + closure->n_inotifiers;
closure->notifiers[i].data = notify_data;
closure->notifiers[i].notify = notify_func;
INC (closure, n_inotifiers);
}
static inline gboolean
closure_try_remove_inotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
GClosureNotifyData *ndata, *nlast;
nlast = closure->notifiers + CLOSURE_N_NOTIFIERS (closure) - 1;
for (ndata = nlast + 1 - closure->n_inotifiers; ndata <= nlast; ndata++)
if (ndata->notify == notify_func && ndata->data == notify_data)
{
DEC (closure, n_inotifiers);
if (ndata < nlast)
*ndata = *nlast;
return TRUE;
}
return FALSE;
}
static inline gboolean
closure_try_remove_fnotify (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
GClosureNotifyData *ndata, *nlast;
nlast = closure->notifiers + CLOSURE_N_NOTIFIERS (closure) - closure->n_inotifiers - 1;
for (ndata = nlast + 1 - closure->n_fnotifiers; ndata <= nlast; ndata++)
if (ndata->notify == notify_func && ndata->data == notify_data)
{
DEC (closure, n_fnotifiers);
if (ndata < nlast)
*ndata = *nlast;
if (closure->n_inotifiers)
closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers)] = closure->notifiers[(CLOSURE_N_MFUNCS (closure) +
closure->n_fnotifiers +
closure->n_inotifiers)];
return TRUE;
}
return FALSE;
}
/**
* g_closure_ref:
* @closure: #GClosure to increment the reference count on
*
* Increments the reference count on a closure to force it staying
* alive while the caller holds a pointer to it.
*
* Returns: The @closure passed in, for convenience
*/
EXPORT_C GClosure*
g_closure_ref (GClosure *closure)
{
guint new_ref_count;
g_return_val_if_fail (closure != NULL, NULL);
g_return_val_if_fail (closure->ref_count > 0, NULL);
g_return_val_if_fail (closure->ref_count < CLOSURE_MAX_REF_COUNT, NULL);
INC_ASSIGN (closure, ref_count, &new_ref_count);
g_return_val_if_fail (new_ref_count > 1, NULL);
return closure;
}
/**
* g_closure_invalidate:
* @closure: GClosure to invalidate
*
* Sets a flag on the closure to indicate that its calling
* environment has become invalid, and thus causes any future
* invocations of g_closure_invoke() on this @closure to be
* ignored. Also, invalidation notifiers installed on the closure will
* be called at this point. Note that unless you are holding a
* reference to the closure yourself, the invalidation notifiers may
* unref the closure and cause it to be destroyed, so if you need to
* access the closure after calling g_closure_invalidate(), make sure
* that you've previously called g_closure_ref().
*
* Note that g_closure_invalidate() will also be called when the
* reference count of a closure drops to zero (unless it has already
* been invalidated before).
*/
EXPORT_C void
g_closure_invalidate (GClosure *closure)
{
g_return_if_fail (closure != NULL);
if (!closure->is_invalid)
{
gboolean was_invalid;
g_closure_ref (closure); /* preserve floating flag */
SWAP (closure, is_invalid, TRUE, &was_invalid);
/* invalidate only once */
if (!was_invalid)
closure_invoke_notifiers (closure, INOTIFY);
g_closure_unref (closure);
}
}
/**
* g_closure_unref:
* @closure: #GClosure to decrement the reference count on
*
* Decrements the reference count of a closure after it was previously
* incremented by the same caller. If no other callers are using the
* closure, then the closure will be destroyed and freed.
*/
EXPORT_C void
g_closure_unref (GClosure *closure)
{
guint new_ref_count;
g_return_if_fail (closure != NULL);
g_return_if_fail (closure->ref_count > 0);
if (closure->ref_count == 1) /* last unref, invalidate first */
g_closure_invalidate (closure);
DEC_ASSIGN (closure, ref_count, &new_ref_count);
if (new_ref_count == 0)
{
closure_invoke_notifiers (closure, FNOTIFY);
g_free (closure->notifiers);
g_free (closure);
}
}
/**
* g_closure_sink:
* @closure: #GClosure to decrement the initial reference count on, if it's
* still being held
*
* Takes over the initial ownership of a closure. Each closure is
* initially created in a <firstterm>floating</firstterm> state, which
* means that the initial reference count is not owned by any caller.
* g_closure_sink() checks to see if the object is still floating, and
* if so, unsets the floating state and decreases the reference
* count. If the closure is not floating, g_closure_sink() does
* nothing. The reason for the existance of the floating state is to
* prevent cumbersome code sequences like:
* |[
* closure = g_cclosure_new (cb_func, cb_data);
* g_source_set_closure (source, closure);
* g_closure_unref (closure); // XXX GObject doesn't really need this
* ]|
* Because g_source_set_closure() (and similar functions) take ownership of the
* initial reference count, if it is unowned, we instead can write:
* |[
* g_source_set_closure (source, g_cclosure_new (cb_func, cb_data));
* ]|
*
* Generally, this function is used together with g_closure_ref(). Ane example
* of storing a closure for later notification looks like:
* |[
* static GClosure *notify_closure = NULL;
* void
* foo_notify_set_closure (GClosure *closure)
* {
* if (notify_closure)
* g_closure_unref (notify_closure);
* notify_closure = closure;
* if (notify_closure)
* {
* g_closure_ref (notify_closure);
* g_closure_sink (notify_closure);
* }
* }
* ]|
*
* Because g_closure_sink() may decrement the reference count of a closure
* (if it hasn't been called on @closure yet) just like g_closure_unref(),
* g_closure_ref() should be called prior to this function.
*/
EXPORT_C void
g_closure_sink (GClosure *closure)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (closure->ref_count > 0);
/* floating is basically a kludge to avoid creating closures
* with a ref_count of 0. so the intial ref_count a closure has
* is unowned. with invoking g_closure_sink() code may
* indicate that it takes over that intiial ref_count.
*/
if (closure->floating)
{
gboolean was_floating;
SWAP (closure, floating, FALSE, &was_floating);
/* unref floating flag only once */
if (was_floating)
g_closure_unref (closure);
}
}
/**
* g_closure_remove_invalidate_notifier:
* @closure: a #GClosure
* @notify_data: data which was passed to g_closure_add_invalidate_notifier()
* when registering @notify_func
* @notify_func: the callback function to remove
*
* Removes an invalidation notifier.
*
* Notice that notifiers are automatically removed after they are run.
*/
EXPORT_C void
g_closure_remove_invalidate_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
if (closure->is_invalid && closure->in_inotify && /* account removal of notify_func() while it's called */
((gpointer) closure->marshal) == ((gpointer) notify_func) &&
closure->data == notify_data)
closure->marshal = NULL;
else if (!closure_try_remove_inotify (closure, notify_data, notify_func))
g_warning (G_STRLOC ": unable to remove uninstalled invalidation notifier: %p (%p)",
notify_func, notify_data);
}
/**
* g_closure_remove_finalize_notifier:
* @closure: a #GClosure
* @notify_data: data which was passed to g_closure_add_finalize_notifier()
* when registering @notify_func
* @notify_func: the callback function to remove
*
* Removes a finalization notifier.
*
* Notice that notifiers are automatically removed after they are run.
*/
EXPORT_C void
g_closure_remove_finalize_notifier (GClosure *closure,
gpointer notify_data,
GClosureNotify notify_func)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (notify_func != NULL);
if (closure->is_invalid && !closure->in_inotify && /* account removal of notify_func() while it's called */
((gpointer) closure->marshal) == ((gpointer) notify_func) &&
closure->data == notify_data)
closure->marshal = NULL;
else if (!closure_try_remove_fnotify (closure, notify_data, notify_func))
g_warning (G_STRLOC ": unable to remove uninstalled finalization notifier: %p (%p)",
notify_func, notify_data);
}
/**
* g_closure_invoke:
* @closure: a #GClosure
* @return_value: 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: an array of #GValue<!-- -->s holding the arguments on
* which to invoke the callback of @closure
* @invocation_hint: a context-dependent invocation hint
*
* Invokes the closure, i.e. executes the callback represented by the @closure.
*/
EXPORT_C void
g_closure_invoke (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint)
{
g_return_if_fail (closure != NULL);
g_closure_ref (closure); /* preserve floating flag */
if (!closure->is_invalid)
{
GClosureMarshal marshal;
gpointer marshal_data;
gboolean in_marshal = closure->in_marshal;
g_return_if_fail (closure->marshal || closure->meta_marshal);
SET (closure, in_marshal, TRUE);
if (closure->meta_marshal)
{
marshal_data = closure->notifiers[0].data;
marshal = (GClosureMarshal) closure->notifiers[0].notify;
}
else
{
marshal_data = NULL;
marshal = closure->marshal;
}
if (!in_marshal)
closure_invoke_notifiers (closure, PRE_NOTIFY);
marshal (closure,
return_value,
n_param_values, param_values,
invocation_hint,
marshal_data);
if (!in_marshal)
closure_invoke_notifiers (closure, POST_NOTIFY);
SET (closure, in_marshal, in_marshal);
}
g_closure_unref (closure);
}
/**
* g_closure_set_marshal:
* @closure: a #GClosure
* @marshal: a #GClosureMarshal function
*
* Sets the marshaller of @closure. The <literal>marshal_data</literal>
* of @marshal provides a way for a meta marshaller to provide additional
* information to the marshaller. (See g_closure_set_meta_marshal().) For
* GObject's C predefined marshallers (the g_cclosure_marshal_*()
* functions), what it provides is a callback function to use instead of
* @closure->callback.
*/
EXPORT_C void
g_closure_set_marshal (GClosure *closure,
GClosureMarshal marshal)
{
g_return_if_fail (closure != NULL);
g_return_if_fail (marshal != NULL);
if (closure->marshal && closure->marshal != marshal)
g_warning ("attempt to override closure->marshal (%p) with new marshal (%p)",
closure->marshal, marshal);
else
closure->marshal = marshal;
}
/**
* g_cclosure_new:
* @callback_func: the function to invoke
* @user_data: user data to pass to @callback_func
* @destroy_data: destroy notify to be called when @user_data is no longer used
*
* Creates a new closure which invokes @callback_func with @user_data as
* the last parameter.
*
* Returns: a new #GCClosure
*/
EXPORT_C GClosure*
g_cclosure_new (GCallback callback_func,
gpointer user_data,
GClosureNotify destroy_data)
{
GClosure *closure;
g_return_val_if_fail (callback_func != NULL, NULL);
closure = g_closure_new_simple (sizeof (GCClosure), user_data);
if (destroy_data)
g_closure_add_finalize_notifier (closure, user_data, destroy_data);
((GCClosure*) closure)->callback = (gpointer) callback_func;
return closure;
}
/**
* g_cclosure_new_swap:
* @callback_func: the function to invoke
* @user_data: user data to pass to @callback_func
* @destroy_data: destroy notify to be called when @user_data is no longer used
*
* Creates a new closure which invokes @callback_func with @user_data as
* the first parameter.
*
* Returns: a new #GCClosure
*/
EXPORT_C GClosure*
g_cclosure_new_swap (GCallback callback_func,
gpointer user_data,
GClosureNotify destroy_data)
{
GClosure *closure;
g_return_val_if_fail (callback_func != NULL, NULL);
closure = g_closure_new_simple (sizeof (GCClosure), user_data);
if (destroy_data)
g_closure_add_finalize_notifier (closure, user_data, destroy_data);
((GCClosure*) closure)->callback = (gpointer) callback_func;
SET (closure, derivative_flag, TRUE);
return closure;
}
static void
g_type_class_meta_marshal (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GTypeClass *class;
gpointer callback;
/* GType itype = (GType) closure->data; */
guint offset = GPOINTER_TO_UINT (marshal_data);
class = G_TYPE_INSTANCE_GET_CLASS (g_value_peek_pointer (param_values + 0), itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
if (callback)
closure->marshal (closure,
return_value,
n_param_values, param_values,
invocation_hint,
callback);
}
static void
g_type_iface_meta_marshal (GClosure *closure,
GValue /*out*/ *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data)
{
GTypeClass *class;
gpointer callback;
GType itype = (GType) closure->data;
guint offset = GPOINTER_TO_UINT (marshal_data);
class = G_TYPE_INSTANCE_GET_INTERFACE (g_value_peek_pointer (param_values + 0), itype, GTypeClass);
callback = G_STRUCT_MEMBER (gpointer, class, offset);
if (callback)
closure->marshal (closure,
return_value,
n_param_values, param_values,
invocation_hint,
callback);
}
/**
* g_signal_type_cclosure_new:
* @itype: the #GType identifier of an interface or classed type
* @struct_offset: the offset of the member function of @itype's class
* structure which is to be invoked by the new closure
*
* Creates a new closure which invokes the function found at the offset
* @struct_offset in the class structure of the interface or classed type
* identified by @itype.
*
* Returns: a new #GCClosure
*/
EXPORT_C GClosure*
g_signal_type_cclosure_new (GType itype,
guint struct_offset)
{
GClosure *closure;
g_return_val_if_fail (G_TYPE_IS_CLASSED (itype) || G_TYPE_IS_INTERFACE (itype), NULL);
g_return_val_if_fail (struct_offset >= sizeof (GTypeClass), NULL);
closure = g_closure_new_simple (sizeof (GClosure), (gpointer) itype);
if (G_TYPE_IS_INTERFACE (itype))
g_closure_set_meta_marshal (closure, GUINT_TO_POINTER (struct_offset), g_type_iface_meta_marshal);
else
g_closure_set_meta_marshal (closure, GUINT_TO_POINTER (struct_offset), g_type_class_meta_marshal);
return closure;
}
/**
* g_cclosure_marshal_VOID__VOID:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 1
* @param_values: a #GValue array holding only the instance
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__BOOLEAN:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gboolean parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gboolean arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__CHAR:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gchar parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gchar arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__UCHAR:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #guchar parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, guchar arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__INT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gint parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gint arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__UINT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #guint parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, guint arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__LONG:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #glong parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, glong arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__ULONG:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gulong parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gulong arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__ENUM:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the enumeration parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gint arg1, gpointer user_data)</literal> where the #gint parameter denotes an enumeration type..
*/
/**
* g_cclosure_marshal_VOID__FLAGS:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the flags parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gint arg1, gpointer user_data)</literal> where the #gint parameter denotes a flags type.
*/
/**
* g_cclosure_marshal_VOID__FLOAT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gfloat parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gfloat arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__DOUBLE:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gdouble parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gdouble arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__STRING:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gchar* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, const gchar *arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__PARAM:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GParamSpec* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, GParamSpec *arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__BOXED:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GBoxed* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, GBoxed *arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__POINTER:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #gpointer parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, gpointer arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__OBJECT:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 2
* @param_values: a #GValue array holding the instance and the #GObject* parameter
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, GOBject *arg1, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_VOID__UINT_POINTER:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: ignored
* @n_param_values: 3
* @param_values: a #GValue array holding instance, arg1 and arg2
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>void (*callback) (gpointer instance, guint arg1, gpointer arg2, gpointer user_data)</literal>.
*/
/**
* g_cclosure_marshal_BOOLEAN__FLAGS:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: a #GValue which can store the returned #gboolean
* @n_param_values: 2
* @param_values: a #GValue array holding instance and arg1
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>gboolean (*callback) (gpointer instance, gint arg1, gpointer user_data)</literal> where the #gint parameter
* denotes a flags type.
*/
/**
* g_cclosure_marshal_BOOL__FLAGS:
*
* Another name for g_cclosure_marshal_BOOLEAN__FLAGS().
*/
/**
* g_cclosure_marshal_STRING__OBJECT_POINTER:
* @closure: the #GClosure to which the marshaller belongs
* @return_value: a #GValue, which can store the returned string
* @n_param_values: 3
* @param_values: a #GValue array holding instance, arg1 and arg2
* @invocation_hint: the invocation hint given as the last argument
* to g_closure_invoke()
* @marshal_data: additional data specified when registering the marshaller
*
* A marshaller for a #GCClosure with a callback of type
* <literal>gchar* (*callback) (gpointer instance, GObject *arg1, gpointer arg2, gpointer user_data)</literal>.
*/
#define __G_CLOSURE_C__
#include "gobjectaliasdef.c"