diff options
| -rw-r--r-- | src/Makefile.am | 1 | ||||
| -rw-r--r-- | src/mm-utils.h | 83 |
2 files changed, 84 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 3b545ee2..54297c0c 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -166,6 +166,7 @@ ModemManager_SOURCES = \ mm-context.c \ mm-log.c \ mm-log.h \ + mm-utils.h \ mm-private-boxed-types.h \ mm-private-boxed-types.c \ mm-auth.h \ diff --git a/src/mm-utils.h b/src/mm-utils.h new file mode 100644 index 00000000..2b0a9340 --- /dev/null +++ b/src/mm-utils.h @@ -0,0 +1,83 @@ +/* -*- 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 */ |