Lock

Notice: ext-swoole is supported until v4.7.1, use ext-openswoole >= v4.7.1. Latest version: pecl install openswoole-4.8.1

Lock can be used for data synchronization between multiple processes.

Locks should not be used within coroutine context.

Methods

Lock types:

Constant Description
SWOOLE_FILELOCK file lock
SWOOLE_RWLOCK read write lock
SWOOLE_SEM Linux semaphore
SWOOLE_MUTEX Mutex
SWOOLE_SPINLOCK spin lock


Example:

<?php

$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";