/**
* g_closure_set_meta_marshal: (skip)
* @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.
*/
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);
}
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;
}
/**
* g_closure_add_marshal_guards: (skip)
* @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.
*/
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);
}
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;
}
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;
}