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author | Xavier Claessens <xavier.claessens@collabora.com> | 2015-02-05 10:35:42 -0500 |
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committer | Xavier Claessens <xavier.claessens@collabora.com> | 2015-02-05 14:15:45 -0500 |
commit | a2e117de51ed911ad75a0a7982a5216953c8269e (patch) | |
tree | e966c345a9ec604cb64b101cb04f93bb358f5972 | |
parent | 74c22150cf4c2f8a9c7d7fae058a7fd589a94a27 (diff) | |
download | glib-wip/xclaesse/locker.tar.gz |
Add GMutexLockerwip/xclaesse/locker
https://bugzilla.gnome.org/show_bug.cgi?id=744012
-rw-r--r-- | docs/reference/glib/glib-sections.txt | 5 | ||||
-rw-r--r-- | glib/gthread.h | 69 |
2 files changed, 74 insertions, 0 deletions
diff --git a/docs/reference/glib/glib-sections.txt b/docs/reference/glib/glib-sections.txt index f48c2f00b..45827d6da 100644 --- a/docs/reference/glib/glib-sections.txt +++ b/docs/reference/glib/glib-sections.txt @@ -649,6 +649,11 @@ g_mutex_trylock g_mutex_unlock <SUBSECTION> +GMutexLocker +g_mutex_locker_new +g_mutex_locker_free + +<SUBSECTION> G_LOCK_DEFINE G_LOCK_DEFINE_STATIC G_LOCK_EXTERN diff --git a/glib/gthread.h b/glib/gthread.h index 3f026f631..fe4df2400 100644 --- a/glib/gthread.h +++ b/glib/gthread.h @@ -266,6 +266,75 @@ void g_once_init_leave (volatile void *location, GLIB_AVAILABLE_IN_2_36 guint g_get_num_processors (void); +/** + * GMutexLocker: + * + * Opaque type. See g_mutex_locker_new() for details. + * Since: 2.44 + */ +typedef void GMutexLocker; + +/** + * g_mutex_locker_new: + * @mutex: a mutex to lock + * + * Lock @mutex and return a new #GMutexLocker. Unlock with + * g_mutex_locker_free(). Using g_mutex_unlock() on @mutex + * while a #GMutexLocker exists can lead to undefined behaviour. + * + * This is intended to be used with g_autoptr() like this: + * |[ + * typedef struct + * { + * ... + * GMutex mutex; + * ... + * } MyObject; + * + * static void + * my_object_do_stuff (MyObject *self) + * { + * g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&self->mutex); + * + * // Code with mutex locked here + * + * if (cond) + * // No need to unlock + * return; + * + * // Optionally early unlock + * g_clear_pointer (&locker, g_mutex_locker_free); + * + * // Code with mutex unlocked here + * } + * ]| + * + * Returns: a #GMutexLocker + * Since: 2.44 + */ +static inline GMutexLocker * +g_mutex_locker_new (GMutex *mutex) +{ + g_mutex_lock (mutex); + return (GMutexLocker *) mutex; +} + +/** + * g_mutex_locker_free: + * @locker: a GMutexLocker + * + * Unlock @locker's mutex. See g_mutex_locker_new() for details. + * + * Since: 2.44 + */ +static inline void +g_mutex_locker_free (GMutexLocker *locker) +{ + g_mutex_unlock ((GMutex *) locker); +} + +G_DEFINE_AUTOPTR_CLEANUP_FUNC(GMutexLocker, g_mutex_locker_free) + G_END_DECLS #endif /* __G_THREAD_H__ */ |