diff options
Diffstat (limited to 'libcxx/src/mutex.cpp')
| -rw-r--r-- | libcxx/src/mutex.cpp | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/libcxx/src/mutex.cpp b/libcxx/src/mutex.cpp index 9f808ca5076..7226abc6a51 100644 --- a/libcxx/src/mutex.cpp +++ b/libcxx/src/mutex.cpp @@ -199,9 +199,6 @@ static __libcpp_mutex_t mut = _LIBCPP_MUTEX_INITIALIZER; static __libcpp_condvar_t cv = _LIBCPP_CONDVAR_INITIALIZER; #endif -/// NOTE: Changes to flag are done via relaxed atomic stores -/// even though the accesses are protected by a mutex because threads -/// just entering 'call_once` concurrently read from flag. void __call_once(volatile unsigned long& flag, void* arg, void(*func)(void*)) { @@ -238,7 +235,7 @@ __call_once(volatile unsigned long& flag, void* arg, void(*func)(void*)) __libcpp_mutex_unlock(&mut); func(arg); __libcpp_mutex_lock(&mut); - __libcpp_relaxed_store(&flag, ~0ul); + __libcpp_atomic_store(&flag, ~0ul, _AO_Release); __libcpp_mutex_unlock(&mut); __libcpp_condvar_broadcast(&cv); #ifndef _LIBCPP_NO_EXCEPTIONS |
