等待Ruby子pid退出 [英] Waiting for Ruby child pid to exit

问题描述

我正试图派生一个子进程，等待它完成，如果在一定时间内没有完成，请杀死它.

I'm trying to fork a sub-process, wait for it to finish, if it doesn't finish within a certain amount of time, kill it.

这是我到目前为止所拥有的:

This is what I have so far:

servers.each do |server|
    pid = fork do
        puts "Forking #{server}."
        output = "doing stuff here"
        puts output
    end

    Process.wait
    puts "#{server} child exited, pid = #{pid}"
end

在Process.wait之后/周围的某个地方，我希望某种实用程序等待20秒，如果该进程仍然存在，我想杀死它并将输出标记为"ERROR".

Somewhere after/around Process.wait, I would like some sort of utility to wait 20 seconds, and if the process is still out there, I'd like to kill it and mark output as "ERROR."

我是fork/exec的新手.我的代码实际上是可以派生的，但是我只是不知道如何处理它的等待/杀死方面.

I'm new to fork/exec. My code actually forking works, but I just don't know how to approach the waiting / killing aspect of it.

推荐答案

使用 http://www.whatastruggle.com/timeout-a-subprocess-in-ruby )

require 'timeout'

servers.each do |server|
    pid = fork do
        puts "Forking #{server}."
        output = "doing stuff here"
        puts output
    end

    begin
        Timeout.timeout(20) do
            Process.wait
        end
    rescue Timeout::Error
        Process.kill 9, pid
        # collect status so it doesn't stick around as zombie process
        Process.wait pid
    end
    puts "#{server} child exited, pid = #{pid}"
end

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