如何使用 PHP 生成并发进程？

发布于 2024-09-15 06:27:49 字数 463 浏览 6 评论 0原文

我试图使用 proc_open 在 PHP 中一次生成多个进程，但第二个调用只有在第一个进程结束后才会启动。这是我正在使用的代码：

for ($i = 0; $i < 2; $i++)
{
    $cmdline = "sleep 5";
    print $cmdline . "\n";
    $descriptors = array(0 => array('file', '/dev/null', 'r'), 
                         1 => array('file', '/dev/null', 'w'), 
                         2 => array('file', '/dev/null', 'w'));
    $proc = proc_open($cmdline, $descriptors, $pipes);
    print "opened\n";
}

原文

I'm trying to spawn multiple processes at once in PHP with proc_open, but the second call won't start until the first process has ended. Here's the code I'm using:

for ($i = 0; $i < 2; $i++)
{
    $cmdline = "sleep 5";
    print $cmdline . "\n";
    $descriptors = array(0 => array('file', '/dev/null', 'r'), 
                         1 => array('file', '/dev/null', 'w'), 
                         2 => array('file', '/dev/null', 'w'));
    $proc = proc_open($cmdline, $descriptors, $pipes);
    print "opened\n";
}

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好菇凉咱不稀罕他 2024-09-22 06:27:49

其他人指出了替代方案，但您的实际问题可能是 $proc 变量的泄漏。我相信 PHP 必须跟踪这一点，如果您覆盖它，它会为您清理（这意味着 proc_close，这意味着等待...）

尝试不要泄漏 $proc 值：

<?php
$procs = array();
for ($i = 0; $i < 2; $i++)
{
  $cmdline = "sleep 5";
  print $cmdline . "\n";
  $descriptors = array(0 => array('file', '/dev/null', 'r'),
    1 => array('file', '/dev/null', 'w'),
    2 => array('file', '/dev/null', 'w'));
  $procs[]= proc_open($cmdline, $descriptors, $pipes);
  print "opened\n";
}
?>

注意：这仍然会在退出之前清理进程句柄，因此所有进程都必须首先完成。在完成您需要对这些进行的操作（即：读取管道等）后，您应该使用 proc_close 。如果您真正想要的是启动它们并忘记它们，那是一个不同的解决方案。

Others are pointing out alternatives, but your actual problem is likely the leaking of your $proc variable. I believe PHP has to keep track of this and if you are overwriting it, it will clean up for you (which means proc_close, which means waiting...)

Try not leaking the $proc value:

<?php
$procs = array();
for ($i = 0; $i < 2; $i++)
{
  $cmdline = "sleep 5";
  print $cmdline . "\n";
  $descriptors = array(0 => array('file', '/dev/null', 'r'),
    1 => array('file', '/dev/null', 'w'),
    2 => array('file', '/dev/null', 'w'));
  $procs[]= proc_open($cmdline, $descriptors, $pipes);
  print "opened\n";
}
?>

Note: This will still clean up your process handles before exiting, so all processes will have to complete first. You should use proc_close after you are done doing whatever you need to do with these (ie: read pipes, etc). If what you really want is to launch them and forget about them, that is a different solution.

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