Hi, shulam

Ah, the woes with signal handling :)

use 5.20.2;
use warnings;
use threads;

use Time::HiRes qw/ time usleep /;

$SIG{USR2} = 'IGNORE';
$SIG{TERM} = 'IGNORE';

my $pid;

if (($pid = fork()) == 0) {
    sleep 1;
    my $ppid = getppid();
    for (1 .. 1000) {
        usleep(int(rand(100000)));
        kill 'USR2', $ppid;
        kill 'TERM', $ppid;
    }
}

my $main_thr = threads->self();

$SIG{TERM} = sub { say "TERM"; };
$SIG{USR2} = sub { say "USR2"; };

my $thread = threads->create(sub {
    # Depending on implementation, the thread may receive the signal.
    # One way is to relay the signal to the intended recepient.
    $SIG{TERM} = $SIG{USR2} = sub {
        $main_thr->kill($_[0]);
    };
    # Sleep stops early upon receiving a signal.
    my $start = time;
    do {
        usleep 1000;
    } until (time - $start >= 10.0);
    threads->exit();
});

# Wait for thread to finish.
while ($thread->is_running()) {
    usleep 1000;
}

# Reap thread.
$thread->join();

# Ditto, reap child.
kill('KILL', $pid);
waitpid($pid, 0);

[download]

Regards, Mario

In reply to Re: Interesting behaviour with signals and threads by marioroy
in thread Interesting behaviour with signals and threads by shulam

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