Home  >  Article  >  Backend Development  >  强制PHP命令行脚本单进程运行的方法_php实例

强制PHP命令行脚本单进程运行的方法_php实例

WBOY
WBOYOriginal
2016-05-17 08:45:44917browse

复制代码 代码如下:

 /**
  * 保证单进程
  *
  * @param string $processName 进程名
  * @param string $pidFile 进程文件路径
  * @return boolean 是否继续执行当前进程
  */
 function singleProcess($processName, $pidFile)
 {
  if (file_exists($pidFile) && $fp = @fopen($pidFile,"rb"))
  {
   flock($fp, LOCK_SH);
   $last_pid = fread($fp, filesize($pidFile));
   fclose($fp);

   if (!empty($last_pid))
   {
    $command = exec("/bin/ps -p $last_pid -o command=");

    if ($command == $processName)
    {
     return false;
    }
   }
  }

  $cur_pid = posix_getpid();

  if ($fp = @fopen($pidFile, "wb"))
  {
   fputs($fp, $cur_pid);
   ftruncate($fp, strlen($cur_pid));
   fclose($fp);

   return true;
  }
  else
  {
   return false;
  }
 }

 /**
  * 获取当前进程对应的Command
  *
  * @return string 命令及其参数
  */
 function getCurrentCommand()
 {
  $pid     = posix_getpid();
  $command = exec("/bin/ps -p $pid -o command=");

  return $command;
 }

使用方法:

复制代码 代码如下:

if (singleProcess(getCurrentCommand(), 'path/to/script.pid'))
{
    // code goes here
}
else
{
 exit("Sorry, this script file has already been running ...\n");
}
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn