C++ (Cpp) __down_read_trylock示例

示例#1

/*
 * trylock for reading -- returns 1 if successful, 0 if contention
 */
int down_read_trylock(struct rw_semaphore *sem)
{
	int ret = __down_read_trylock(sem);

	if (ret == 1)
		rwsem_acquire_read(&sem->dep_map, 0, 1, _RET_IP_);
	return ret;
}

示例#2

int down_read_trylock_nested(struct rw_semaphore *sem, int subclass)
{
	int ret = __down_read_trylock(sem);

	if (ret == 1)
		rwsem_acquire_read(&sem->dep_map, subclass, 1, _RET_IP_);
	return ret;
}