17876994c4
This was required when building with GLib < 2.54, but we now require 2.56 as minimum, so it is no longer needed.
84 lines
4.2 KiB
C
84 lines
4.2 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details:
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*
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* Singleton support imported from NetworkManager.
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* (C) Copyright 2014 Red Hat, Inc.
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*
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* GPtrArray lookup with GEqualFunc imported from GLib 2.48
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*/
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#ifndef MM_UTILS_H
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#define MM_UTILS_H
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#include <glib.h>
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#include <glib-object.h>
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#include "mm-log-object.h"
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/*****************************************************************************/
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#define MM_DEFINE_SINGLETON_INSTANCE(TYPE) \
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static TYPE *singleton_instance;
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#define MM_DEFINE_SINGLETON_WEAK_REF(TYPE) \
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static void \
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_singleton_instance_weak_ref_cb (gpointer data, \
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GObject *where_the_object_was) \
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{ \
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mm_obj_dbg (singleton_instance, "singleton disposed"); \
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singleton_instance = NULL; \
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} \
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static inline void \
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mm_singleton_instance_weak_ref_register (void) \
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{ \
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g_object_weak_ref (G_OBJECT (singleton_instance), _singleton_instance_weak_ref_cb, NULL); \
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}
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#define MM_DEFINE_SINGLETON_DESTRUCTOR(TYPE) \
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static void __attribute__((destructor)) \
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_singleton_destructor (void) \
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{ \
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if (singleton_instance) { \
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if (G_OBJECT (singleton_instance)->ref_count > 1) \
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mm_obj_dbg (singleton_instance, "singleton disowned"); \
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g_object_unref (singleton_instance); \
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} \
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}
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/* By default, the getter will assert that the singleton will be created only once. You can
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* change this by redefining MM_DEFINE_SINGLETON_ALLOW_MULTIPLE. */
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#ifndef MM_DEFINE_SINGLETON_ALLOW_MULTIPLE
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#define MM_DEFINE_SINGLETON_ALLOW_MULTIPLE FALSE
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#endif
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#define MM_DEFINE_SINGLETON_GETTER(TYPE, GETTER, GTYPE, ...) \
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MM_DEFINE_SINGLETON_INSTANCE (TYPE) \
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MM_DEFINE_SINGLETON_WEAK_REF (TYPE) \
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TYPE * \
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GETTER (void) \
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{ \
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if (G_UNLIKELY (!singleton_instance)) { \
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static char _already_created = FALSE; \
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\
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g_assert (!_already_created || (MM_DEFINE_SINGLETON_ALLOW_MULTIPLE)); \
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_already_created = TRUE; \
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singleton_instance = (g_object_new (GTYPE, ##__VA_ARGS__, NULL)); \
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g_assert (singleton_instance); \
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mm_singleton_instance_weak_ref_register (); \
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mm_obj_dbg (singleton_instance, "singleton created"); \
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} \
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return singleton_instance; \
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} \
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MM_DEFINE_SINGLETON_DESTRUCTOR(TYPE)
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#endif /* MM_UTILS_H */
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