Swoole 中使用 Lock 实现进程间锁

注意：不要在 lock 和 unlock 操作中间使用可能引起协程切换的 API。

$lock = new SwooleLock(SWOOLE_MUTEX);
echo "[Master]create lock
";
$lock->lock();

if (pcntl_fork() > 0)
{
    sleep(1);
    $lock->unlock();
} else {
    echo "[Child] Wait Lock
";
    $lock->lock();
    echo "[Child] Get Lock
";
    $lock->unlock();
    exit("[Child] exit
");
}

echo "[Master]release lock
";
unset($lock);
sleep(1);
echo "[Master]exit
";