# Lock [TOC] `1.6.4`版本增加了鎖的實現。`PHP`代碼中可以很方便地創建一個鎖，用來實現數據同步。`Lock`類支持`5`種鎖的類型： 1. 文件鎖`SWOOLE_FILELOCK` 2. 讀寫鎖`SWOOLE_RWLOCK` 3. 信號量`SWOOLE_SEM` 4. 互斥鎖`SWOOLE_MUTEX` 5. 自旋鎖`SWOOLE_SPINLOCK` **注意：請勿在`onReceive`等回調函數中創建鎖，否則底層的`GlobalMemory`內存會持續增長，造成內存泄漏。** ## 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"; ~~~