Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Hi, So, I'm attaching my code. The code create 3 sons (with fork). Then each son create 3 grand sons (with thread). What I'm failing to do is to send to a son (started with fork) a USR1 signal , which will make all its grand sons to exit immediatly (and not wait to the grand sons to exit after they finish their work). I want to send the USR1 signal from outside to the son PID. I know there is a limitation and I might can not do that, but do other here another clean way to exit threads of the son immediatly when son gets USR1 signal ? Thanks ! Here is the code , the goal is to make the threads to exit while sleep function starting :
#!/usr/bin/env perl use threads; ##kill -10 handle $SIG{USR1}=\&usr_kill_handler; my @sons = ("Son1","Son2","Son3"); my @childs = (); #Start fork foreach my $son (@sons){ my $pid = fork(); if ($pid) { # parent push(@childs, $pid); }elsif($pid == 0) { # child my $results = new testProcess($son); exit 0; }else { print "\nerror : couldnt fork: $!\n"; exit 1; } } #Wait for to end foreach my $child (@childs) { my $tmp = waitpid($child, 0); print "\ninfo : done with pid $tmp\n"; } sub usr_kill_handler{ #Send SIGUSR1 to all childs (started with fork) kill SIGUSR1 => @childs; print "\n\n Stoped due to user request!\n\n"; #Wait to all childs to exit foreach my $child (@childs) { my $tmp = waitpid($child, 0); print "\ndone with pid $tmp\n"; } # After all child ended kill father exit 1; } package testProcess; sub new{ my $class = shift; my ($son) = @_; ##kill -10 handle $SIG{USR1}=sub { print "\n Got signal to son $son with pid ".$$." \n"; threads->exit; }; print "\nSon $son with PID ".$$." Started\n"; my %hash_results = (); my @grand_sons = ("Grand son 1","Grand son 2","Grand son 3"); my @threads = (); #Start new thread foreach my $grand_son (@grand_sons){ my $t = threads->create (\&start_threads,$son,$grand_son); push(@threads,$t); } my $index=0; foreach my $thread (@threads) #wait for all threads untill the end + and insert results to hash { $hash_results{$index}=$thread->join; $index++; } print "\nSon $son with PID ".$$." Finished\n"; } sub start_threads{ my ($son,$grand_son) = @_; print "\nSon $son grand son $grand_son started\n"; my $random_number = int(rand(100)); my $msg = "Son $son grand son $grand_son returns random number $ra +ndom_number"; print "\n$msg\n"; sleep 100; return $random_number; } 1;

In reply to Re^8: killing threads inside forks by mojo2405
in thread killing threads inside forks by mojo2405

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others examining the Monastery: (4)
    As of 2018-07-17 04:02 GMT
    Find Nodes?
      Voting Booth?
      It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?

      Results (354 votes). Check out past polls.