Change atfork lock from mutex to rwlock, also make mutexes used by malloc()

module private type, when private type mutex is locked/unlocked, thread
critical region is entered or leaved. These changes makes fork()
async-signal safe which required by POSIX. Note that user's atfork handler
still needs to be async-signal safe, but it is not problem of libthr, it
is user's responsiblity.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/libthr/thread/thr_init.c b/lib/libthr/thread/thr_init.c
index ea567ee..e5dc2ce 100644
--- a/lib/libthr/thread/thr_init.c
+++ b/lib/libthr/thread/thr_init.c
@@ -65,7 +65,7 @@ pthreadlist	_thread_list = TAILQ_HEAD_INITIALIZER(_thread_list);
 pthreadlist 	_thread_gc_list = TAILQ_HEAD_INITIALIZER(_thread_gc_list);
 int		_thread_active_threads = 1;
 atfork_head	_thr_atfork_list = TAILQ_HEAD_INITIALIZER(_thr_atfork_list);
-struct umutex	_thr_atfork_lock = DEFAULT_UMUTEX;
+struct urwlock	_thr_atfork_lock = DEFAULT_URWLOCK;
 
 struct pthread_prio	_thr_priorities[3] = {
 	{RTP_PRIO_MIN,  RTP_PRIO_MAX, 0}, /* FIFO */
@@ -427,7 +427,7 @@ init_private(void)
 	_thr_umutex_init(&_cond_static_lock);
 	_thr_umutex_init(&_rwlock_static_lock);
 	_thr_umutex_init(&_keytable_lock);
-	_thr_umutex_init(&_thr_atfork_lock);
+	_thr_urwlock_init(&_thr_atfork_lock);
 	_thr_umutex_init(&_thr_event_lock);
 	_thr_once_init();
 	_thr_spinlock_init();