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Re: Re: returning from a thread ?

by Foggy Bottoms (Monk)
on Aug 21, 2003 at 14:03 UTC ( #285470=note: print w/replies, xml ) Need Help??

in reply to Re: returning from a thread ?
in thread returning from a thread ?

I didn't manage to use the shared variable "thinggie" - as I don't have the shared package and since I didn't find it on the ActiveState repository...
Instead I used a file in which I'm writing a byte (0 for inactive 1 for active)( I know you're thinking it's way too slow but it works fine anyhow...)

However when the new thread starts up, it blocks the main program and I can't do anything else.
I know someone already posted a node about this but I can't seem to find it anymore (bad luck :~/ )
If you've any idea, let me know, and thanks again for your help...

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Re: Re: Re: returning from a thread ?
by liz (Monsignor) on Aug 21, 2003 at 14:07 UTC
    Strange. Which version of Perl are you using on which platform? The main program should not block!


      Here's my bit of code below :
      # now stop the current scan thread # to do this, write in a file the value 0 if (defined $thread) { open (THREADCOM, ">".LTG::dialog::THREADCOM) or die "Can't creat +e/overwrite file: $!\n"; print (THREADCOM,"0"); close THREADCOM; # stop thread } print "create thread\n"; $thread = threads->new(\&LTG::scanChange::monitor());# \&LTG::scanC +hange::monitor); $thread->detach(); # let go off the new thread
      And here's the sub's code
      sub monitor { my @wantedF; # folders to be scanned my @bannedF; # banned folders not to be scanned if ( -e LTG::dialog::CONFIGFILE) { open(FOLDERLIST,LTG::dialog::CONFIGFILE) or die "can't open file +"; my $content = <FOLDERLIST>; my $addForce = 0; while ($content) { if ($content ne "\n") { $content =~ s/\n/ /; ($content =~/^\#FORCE\#/)?($addForce = 1):(($content =~/^\# +BAN\#/)?($addForce = 0):($addForce?push(@wantedF,$content):push(@bann +edF,$content))); } $content = <FOLDERLIST>; } close (FOLDERLIST); } open (THREADCOM, ">".LTG::dialog::THREADCOM) or die "Can't create/o +verwrite file: $!\n"; print THREADCOM "1"; close THREADCOM; my $active = 1; while ($active) { if ( -e LTG::dialog::THREADCOM) { open(THREADCOM,LTG::dialog::THREADCOM) or die "can't open fil +e THREADCOM"; $active = <THREADCOM>; print "active : $active \n"; close THREADCOM; } my %changes = LTG::scanChange::startScan(\@wantedF,\@bannedF,INC +_SUBDIRS); foreach my $k (keys %changes) { print "key : $k -> content : $changes{$k}\n"; } # update database here Sumith # print "---while---\n"; } }
      I'm running perl on a Winnt 4.0 system, and here's my perl info (perl -v)
      This is perl, v5.6.1 built for MSWin32-x86-multi-thread (with 1 registered patch, see perl -V for more detail) Copyright 1987-2001, Larry Wall Binary build 635 provided by ActiveState Corp. http://www.ActiveState. +com Built 15:34:21 Feb 4 2003 Perl may be copied only under the terms of either the Artistic License + or the GNU General Public License, which may be found in the Perl 5 source ki +t. Complete documentation for Perl, including FAQ lists, should be found +on this system using `man perl' or `perldoc perl'. If you have access to + the Internet, point your browser at, the Perl Home Pa +ge.
        This is perl, v5.6.1...

        This implies that you cannot using ithreads, but this:

        $thread = threads->new(\&LTG::scanChange::monitor());
        implies that you are. Officially, ithreads were not supported under 5.6.1, maybe they were available then already under the hood with Win32. Anyway, they're not guaranteed to work and therefore should not be relied upon. Please upgrade to 5.8.0 before trying to do anything with ithreads.

        Sorry to be the bringer of bad news in that respect.


Re: Re: Re: returning from a thread ?
by bobtfish (Scribe) on Aug 21, 2003 at 17:04 UTC
    Not slow, just ugly.. Very, very ugly..

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