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gobject.h
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gobjectnotifyqueue.c
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Edit file: /usr/include/glib-2.0/gobject/gobjectnotifyqueue.c
/* GObject - GLib Type, Object, Parameter and Signal Library * Copyright (C) 1998-1999, 2000-2001 Tim Janik and 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 2.1 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, see <http://www.gnu.org/licenses/>. */ /* WARNING: * * This file is INSTALLED and other projects (outside of glib) * #include its contents. */ #ifndef __G_OBJECT_NOTIFY_QUEUE_H__ #define __G_OBJECT_NOTIFY_QUEUE_H__ #include <string.h> /* memset */ #include <glib-object.h> G_BEGIN_DECLS /* --- typedefs --- */ typedef struct _GObjectNotifyContext GObjectNotifyContext; typedef struct _GObjectNotifyQueue GObjectNotifyQueue; typedef void (*GObjectNotifyQueueDispatcher) (GObject *object, guint n_pspecs, GParamSpec **pspecs); /* --- structures --- */ struct _GObjectNotifyContext { GQuark quark_notify_queue; GObjectNotifyQueueDispatcher dispatcher; GTrashStack *_nqueue_trash; /* unused */ }; struct _GObjectNotifyQueue { GObjectNotifyContext *context; GSList *pspecs; guint16 n_pspecs; guint16 freeze_count; }; G_LOCK_DEFINE_STATIC(notify_lock); /* --- functions --- */ static void g_object_notify_queue_free (gpointer data) { GObjectNotifyQueue *nqueue = data; g_slist_free (nqueue->pspecs); g_slice_free (GObjectNotifyQueue, nqueue); } static inline GObjectNotifyQueue* g_object_notify_queue_freeze (GObject *object, GObjectNotifyContext *context) { GObjectNotifyQueue *nqueue; G_LOCK(notify_lock); nqueue = g_datalist_id_get_data (&object->qdata, context->quark_notify_queue); if (!nqueue) { nqueue = g_slice_new0 (GObjectNotifyQueue); nqueue->context = context; g_datalist_id_set_data_full (&object->qdata, context->quark_notify_queue, nqueue, g_object_notify_queue_free); } if (nqueue->freeze_count >= 65535) g_critical("Free queue for %s (%p) is larger than 65535," " called g_object_freeze_notify() too often." " Forgot to call g_object_thaw_notify() or infinite loop", G_OBJECT_TYPE_NAME (object), object); else nqueue->freeze_count++; G_UNLOCK(notify_lock); return nqueue; } static inline void g_object_notify_queue_thaw (GObject *object, GObjectNotifyQueue *nqueue) { GObjectNotifyContext *context = nqueue->context; GParamSpec *pspecs_mem[16], **pspecs, **free_me = NULL; GSList *slist; guint n_pspecs = 0; g_return_if_fail (nqueue->freeze_count > 0); g_return_if_fail (g_atomic_int_get(&object->ref_count) > 0); G_LOCK(notify_lock); /* Just make sure we never get into some nasty race condition */ if (G_UNLIKELY(nqueue->freeze_count == 0)) { G_UNLOCK(notify_lock); g_warning ("%s: property-changed notification for %s(%p) is not frozen", G_STRFUNC, G_OBJECT_TYPE_NAME (object), object); return; } nqueue->freeze_count--; if (nqueue->freeze_count) { G_UNLOCK(notify_lock); return; } pspecs = nqueue->n_pspecs > 16 ? free_me = g_new (GParamSpec*, nqueue->n_pspecs) : pspecs_mem; for (slist = nqueue->pspecs; slist; slist = slist->next) { pspecs[n_pspecs++] = slist->data; } g_datalist_id_set_data (&object->qdata, context->quark_notify_queue, NULL); G_UNLOCK(notify_lock); if (n_pspecs) context->dispatcher (object, n_pspecs, pspecs); g_free (free_me); } static inline void g_object_notify_queue_clear (GObject *object, GObjectNotifyQueue *nqueue) { g_return_if_fail (nqueue->freeze_count > 0); G_LOCK(notify_lock); g_slist_free (nqueue->pspecs); nqueue->pspecs = NULL; nqueue->n_pspecs = 0; G_UNLOCK(notify_lock); } static inline void g_object_notify_queue_add (GObject *object, GObjectNotifyQueue *nqueue, GParamSpec *pspec) { if (pspec->flags & G_PARAM_READABLE) { GParamSpec *redirect; G_LOCK(notify_lock); g_return_if_fail (nqueue->n_pspecs < 65535); redirect = g_param_spec_get_redirect_target (pspec); if (redirect) pspec = redirect; /* we do the deduping in _thaw */ if (g_slist_find (nqueue->pspecs, pspec) == NULL) { nqueue->pspecs = g_slist_prepend (nqueue->pspecs, pspec); nqueue->n_pspecs++; } G_UNLOCK(notify_lock); } } /* NB: This function is not threadsafe, do not ever use it if * you need a threadsafe notify queue. * Use g_object_notify_queue_freeze() to acquire the queue and * g_object_notify_queue_thaw() after you are done instead. */ static inline GObjectNotifyQueue* g_object_notify_queue_from_object (GObject *object, GObjectNotifyContext *context) { return g_datalist_id_get_data (&object->qdata, context->quark_notify_queue); } G_END_DECLS #endif /* __G_OBJECT_NOTIFY_QUEUE_H__ */
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