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Re: They didn't give me a fork so I have to eat with a spawn.

by bart (Canon)
on Aug 23, 2002 at 20:52 UTC ( #192447=note: print w/ replies, xml ) Need Help??


in reply to They didn't give me a fork so I have to eat with a spawn.

Win32's Perl 5.6.1 does have an emulated fork(), though. Is there something wrong with that?


Comment on Re: They didn't give me a fork so I have to eat with a spawn.
Re: Re: They didn't give me a fork so I have to eat with a spawn.
by RMGir (Prior) on Aug 23, 2002 at 21:11 UTC
    Win32's Perl 5.6.1 does have an emulated fork(), though. Is there something wrong with that?

    Yup.

    If you try to fork and "spawn" off a bunch of system() calls, you get "Resource temporarily unavailable" after some fairly small number of forks (maybe 20?).

    With Win32::Process::CreateProcess, you don't run into that problem.
    --
    Mike

      Good call.

      BTW you should look into using $^X instead of the hardcoded path to perl.

      will the parent process have to wait until the child complete?
        If you use ActivePerl's fork, I believe so, since no new process is actually created.

        If you use CreateProcess, I don't think so.
        --
        Mike

Re: Re: They didn't give me a fork so I have to eat with a spawn.
by elwarren (Curate) on Aug 24, 2002 at 16:19 UTC
    I've never had much luck with ActiveState's fork. I don't even consider using it when I'm on win32. Most of my problems have been related to sockets. When a daemon accepts a connection and forks off, the socket doesn't have anything to say until the process dies. A socket that doesn't pass data isn't much use to me.

    So I just keep the servers on the servers on client stuff like this on my workstation.

    This code is more usefull for launching perl code without a dos window though, and that's why I wrote it. With this you don't have to bother hiding your dos parent in your code, it's already gone.

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