Lock

swoole1.6.4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。swoole_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内存不足会创建失败。在swoole中可以创建的Lock对象数量有限

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";