Re^2: wait_all_children for Proc::Fork?

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 :-))

Comment on Re^2: wait_all_children for Proc::Fork?

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Re^3: wait_all_children for Proc::Fork? by repellent (Priest) on Jun 10, 2009 at 17:22 UTC
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"); } }` [download]	[reply] [d/l]

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Re^3: wait_all_children for Proc::Fork?
by repellent (Priest) on Jun 10, 2009 at 17:22 UTC

# 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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