Lock

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1. �ļ��� SWOOlE_FILELOCK
2. ��� SWOOLE_RWLOCK
3. �ź��� SWOOLE_SEM
4. ������ SWOOLE_MUTEX
5. ������ SWOOlE_SPINLOCK

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$lock = new swoole_lock(SWOOLE_MUTEX);
echo "[Master]create lock\n";
$lock>lock();
if(pcntl_fork() > 0) 
{
        sleep(1);
        $lock>unlock();
} 
else
{
        echo "[Child] Wait Lock\n";
        $lock>lock();
        echo "[Child] Get Lock\n";
        $lock>unlock();
        exit("[Child] exit\n");
}
echo "[Master]release lock\n";
unset($lock);
sleep(1);
echo "[Master]exit\n";