$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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