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回答

$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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