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Re: Windows, threads and IPC::Open3

by BrowserUk (Pope)
on Nov 07, 2010 at 22:18 UTC ( #869968=note: print w/ replies, xml ) Need Help??


in reply to Windows, threads and IPC::Open3

This is a bit simpler than yours, a lot simpler than the CPAN 'solutions', and it works even if the program produces a lot of output:

#! perl -slw use strict; use IPC::Open3; use threads stack_size => 4096; ## Kill 0,pid does appear to work properly, ## It return true even after the executable is dead & gone sub checkPid{ scalar( `tasklist /nh /fi "pid eq $_[0]"` !~ m[INFO]sm ); } sub execute { my( $timeout, @command, ) = @_; my( $err, $in, $out ) = do{ local *FH; \*FH }; my $pid = open3( $in, $out, $err, @command ) or die "@command : $!/$@/$^E"; my( $Tout ) = threads->create( sub{ my( $Terr ) = threads->create( sub{ my @in = <$err>; return \@ +in } ); my @in = <$out>; return \@in, $Terr->join; } ); sleep 1 while checkPid( $pid ) and --$timeout; kill 3, $pid unless $timeout; return $Tout->join, $timeout == 0; } my @cmd = ( 'perl.exe', q[-le"$|++; print($_), warn( $_), Win32::Sleep 250 for 1 .. 12" ] ); my( $out, $err, $timeout ) = execute( 2, @cmd ); print 'Command ', $timeout ? 'timed out' : 'completed'; print "From stdout:[\n @$out ]" if @$out; print "From stderr:[\n @$err ]\n" if @$err; ( $out, $err, $timeout ) = execute( 5, @cmd ); print 'Command ', $timeout ? 'timed out' : 'completed'; print "From stdout:[\n @$out ]" if @$out; print "From stderr:[\n @$err ]" if @$err;

Produces:

C:\test>869942 Command timed out From stdout:[ 1 2 3 4 5 ] From stderr:[ 1 at -e line 1. 2 at -e line 1. 3 at -e line 1. 4 at -e line 1. 5 at -e line 1. ] Command completed From stdout:[ 1 2 3 4 5 6 7 8 9 10 11 12 ] From stderr:[ 1 at -e line 1. 2 at -e line 1. 3 at -e line 1. 4 at -e line 1. 5 at -e line 1. 6 at -e line 1. 7 at -e line 1. 8 at -e line 1. 9 at -e line 1. 10 at -e line 1. 11 at -e line 1. 12 at -e line 1. ]

The discrepancy between the 1 1/4 seconds of output gathered and the 2 second timeout in the first run, is down to pipe buffering.


Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.


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