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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details:
*
* Singleton support imported from NetworkManager.
* (C) Copyright 2014 Red Hat, Inc.
*/
#ifndef MM_UTILS_H
#define MM_UTILS_H
#include <glib.h>
#include <glib-object.h>
#include "mm-log.h"
/*****************************************************************************/
#define MM_DEFINE_SINGLETON_INSTANCE(TYPE) \
static TYPE *singleton_instance
#define MM_DEFINE_SINGLETON_WEAK_REF(TYPE) \
MM_DEFINE_SINGLETON_INSTANCE (TYPE); \
static void \
_singleton_instance_weak_ref_cb (gpointer data, \
GObject *where_the_object_was) \
{ \
mm_dbg ("disposing %s singleton (%p)", G_STRINGIFY (TYPE), singleton_instance); \
singleton_instance = NULL; \
} \
static inline void \
mm_singleton_instance_weak_ref_register (void) \
{ \
g_object_weak_ref (G_OBJECT (singleton_instance), _singleton_instance_weak_ref_cb, NULL); \
}
#define MM_DEFINE_SINGLETON_DESTRUCTOR(TYPE) \
MM_DEFINE_SINGLETON_INSTANCE (TYPE); \
static void __attribute__((destructor)) \
_singleton_destructor (void) \
{ \
if (singleton_instance) { \
if (G_OBJECT (singleton_instance)->ref_count > 1) \
mm_dbg ("disown %s singleton (%p)", G_STRINGIFY (TYPE), singleton_instance); \
g_object_unref (singleton_instance); \
} \
}
/* By default, the getter will assert that the singleton will be created only once. You can
* change this by redefining MM_DEFINE_SINGLETON_ALLOW_MULTIPLE. */
#ifndef MM_DEFINE_SINGLETON_ALLOW_MULTIPLE
#define MM_DEFINE_SINGLETON_ALLOW_MULTIPLE FALSE
#endif
#define MM_DEFINE_SINGLETON_GETTER(TYPE, GETTER, GTYPE, ...) \
MM_DEFINE_SINGLETON_INSTANCE (TYPE); \
MM_DEFINE_SINGLETON_WEAK_REF (TYPE); \
TYPE * \
GETTER (void) \
{ \
if (G_UNLIKELY (!singleton_instance)) { \
static char _already_created = FALSE; \
\
g_assert (!_already_created || (MM_DEFINE_SINGLETON_ALLOW_MULTIPLE)); \
_already_created = TRUE; \
singleton_instance = (g_object_new (GTYPE, ##__VA_ARGS__, NULL)); \
g_assert (singleton_instance); \
mm_singleton_instance_weak_ref_register (); \
mm_dbg ("create %s singleton (%p)", G_STRINGIFY (TYPE), singleton_instance); \
} \
return singleton_instance; \
} \
MM_DEFINE_SINGLETON_DESTRUCTOR(TYPE)
#endif /* MM_UTILS_H */
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