Lock
最后更新于：2022-04-02 06:31:04
# Lock
[TOC]
`1.6.4`版本增加了锁的实现。`PHP`代码中可以很方便地创建一个锁，用来实现数据同步。`Lock`类支持`5`种锁的类型：
1. 文件锁`SWOOLE_FILELOCK`
2. 读写锁`SWOOLE_RWLOCK`
3. 信号量`SWOOLE_SEM`
4. 互斥锁`SWOOLE_MUTEX`
5. 自旋锁`SWOOLE_SPINLOCK`
**注意：请勿在`onReceive`等回调函数中创建锁，否则底层的`GlobalMemory`内存会持续增长，造成内存泄漏。**
## 示例：
~~~
$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";
~~~
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