php使用flock阻塞写入文件和非阻塞写入文件的实例讲解

php使用flock阻塞写入文件和非阻塞写入文件的实例讲解:

阻塞写入代码:(所有程序会等待上次程序执行结束才会执行,30秒会超时)

<?php
$file = fopen("test.txt","w+");
  
$t1 = microtime(TRUE);
if (flock($file,LOCK_EX))
{
 sleep(10);
 fwrite($file,"Write something");
 flock($file,LOCK_UN);
 echo "Ok locking file!";
}
else
{
 echo "Error locking file!";
}
  
fclose($file);
  
$t2 = microtime(TRUE);
echo sprintf("%.6f",($t2-$t1));

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非阻塞写入代码:(只要文件被占用,则显示Error locking file!):

<?php
$file = fopen("test.txt","a+");
  
$t1 = microtime(TRUE);
if (flock($file,LOCK_EX|LOCK_NB))
{
 sleep(10);
 fwrite($file,"Write something");
 flock($file,LOCK_UN);
 echo "Ok locking file!";
}
else
{
 echo "Error locking file!";
}
  
fclose($file);
  
$t2 = microtime(TRUE);
echo sprintf("%.6f",($t2-$t1));

 

posted @ 2017-07-13 15:18 代码学堂 阅读(...) 评论(...) 编辑 收藏