JEMALLOC_INLINE void
malloc_mutex_lock(malloc_mutex_t *mutex)
{

	if (isthreaded) {
#ifdef _WIN32
#  if _WIN32_WINNT >= 0x0600
		AcquireSRWLockExclusive(&mutex->lock);
#  else
		EnterCriticalSection(&mutex->lock);
#  endif
#elif (defined(JEMALLOC_OSSPIN))
		OSSpinLockLock(&mutex->lock);
#else
		pthread_mutex_lock(&mutex->lock);
#endif
	}
}