atomic_add_if_greater - Haiku

Symbol: atomic_add_if_greater

src/system/libroot/posix/semaphore.cpp

int32 oldValue = atomic_add_if_greater(sem, 1, -1);

src/system/libroot/posix/semaphore.cpp

int32 oldValue = atomic_add_if_greater(sem, -1, 0);