在FastCGI中fork()的正确方法是什么? [英] What's the proper way to fork() in FastCGI?

问题描述

我有一个在Catalyst + FastCGI下运行的应用程序.我希望它 fork()在后台进行一些工作.
我很早以前就将此代码用于普通CGI(并且有效):

I have an app running under Catalyst+FastCGI. And I want it to fork() to do some work in background.
I used this code for plain CGI long ago (and it worked):

defined(my $pid = fork) or die "Can't fork: $!";
if ($pid) {
    # produce some response         
    exit 0;
}

die "Can't start a new session: $!" if setsid == -1;
close STDIN  or die $!;
close STDOUT or die $!;
close STDERR or die $!;
# do some work in background

我在FastCGI下尝试了一些变体，但没有成功.在FastCGI下应该如何进行分叉?

I tried some variations on this under FastCGI but with no success. How should forking be done under FastCGI?

更新:这就是我现在拥有的:

Update: This is what I have now:

defined(my $pid = fork) or die "Can't fork: $!";
    if ($pid) {
        $c->stash->{message} = 'ok';
        $c->detach($c->view('JSON'));
    }
    die "Can't start a new session: $!" if setsid == -1;
    close STDIN  or die $!;
    close STDOUT or die $!;
    close STDERR or die $!;
    # do some work, then exit() 

我通过AJAX调用发送了请求，并且在Firebug控制台中出现"502 Bad Gateway"错误.

I send the request with AJAX call, and have the "502 Bad Gateway" error in the firebug console.

推荐答案

我认为此常见问题解答具有正确的答案: http://www.fastcgi.com/docs/faq.html#Perlfork

I think this FAQ has the right answer: http://www.fastcgi.com/docs/faq.html#Perlfork

您应该在派生代码之前执行$request->Detach();，在分支代码完成之后执行$request->Attach();，其中$ request是当前的FCGI对象.至少对我有用.

You should do $request->Detach(); before the fork, and $request->Attach(); after the forking piece of code is done, where $request is the current FCGI object. At least, it worked for me.

对于Catalyst :: Engine :: FastCGI，您可能需要修补Catalyst :: Engine :: FastCGI才能访问$request变量，因为该变量对于该位置的run()方法是本地的(在CPAN当前使用的版本).

In case of Catalyst::Engine::FastCGI you may need to patch the Catalyst::Engine::FastCGI to get access to the $request variable, since it is local to the run() method there (in the version that is currently on CPAN).

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