in reply to wait_all_children for Proc::Fork?

I would imagine collecting all the child PIDs in the parent process first and then waitpid for them in a loop:
parent { push @child_pids, $_[0] }

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and then after the last run_fork:
# wait to reap all children
for my $pid (@child_pids)
{
    waitpid $pid, 0;
}

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Re^2: wait_all_children for Proc::Fork?
by Bloodnok (Vicar) on Jun 10, 2009 at 09:15 UTC
    At the risk of identifying a problem without proposing a solution, the above would work until one of the children hangs - causing the parent to hang.

    A user level that continues to overstate my experience :-))
[reply]
      Right. Fix the real problem in the child, or just add a timeout:
      # wait to reap all children
for my $pid (@child_pids)
{
    local $SIG{__DIE__};
    local $@ = "";
                                                                   
    eval {
        local $SIG{ALRM} = sub { die("alarm\n") };
        alarm(3600);

        # potentially long operation
        waitpid $pid, 0;

        alarm(0);
        1;
    } or do {
        die($@) unless $@ eq "alarm\n";
                                                                   
        # timed out
        warn("Waited too long for child $pid. Skipping it.\n");
    }
}

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