我正在尝试理解非阻塞flock和wouldblock参数$fp=fopen('/tmp/lock.txt','r+');if(flock($fp,LOCK_EX|LOCK_NB,$wouldblock)){echo'Lockobtained';}else{echo'Unabletoobtainlock';}fclose($fp);关于wouldblock的文档说:Theoptionalthirdargumentissetto1ifthelockwouldblock(EWOULDBLOCKerrnocondition).在测试环境中重现并发条件，如果另一个进程获得了锁，flock函数将立