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POHow do I get the child process id in Parallel::ForkManager?
 

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  1. POHow do I get the child process id in Parallel::ForkManager?
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    <pre><code> use LWP::Simple; use Parallel::ForkManager; @links=( ["http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-windows.exe","SweetHome3D-2.1-windows.exe"], ["http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-macosx.dmg","SweetHome3D-2.1-macosx.dmg"], ["http://prdownloads.sourceforge.net/sweethome3d/SweetHome3DViewer-2.1.zip","SweetHome3DViewer-2.1.zip"], ); # Max 30 processes for parallel download my $pm = new Parallel::ForkManager(30); foreach my $linkarray (@links) { my $pid = $pm-&gt;start and next; # do the fork my ($link,$fn) = @$linkarray; warn "Cannot get $fn from $link" if getstore($link,$fn) != RC_OK; print "$pid = $link is done "; $pm-&gt;finish; # do the exit in the child process } $pm-&gt;wait_all_children; </code></pre> <p>after this execution i am going pid is zero </p> <pre> 0 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3DViewer-2.1.zip is done 0 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-macosx.dmg is done 0 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-windows.exe is done </pre> <p>But now I really thinking whether its really doing the fork. Why I am getting all times 0 as pid in Parallel::ForkManager? </p> <p><strong><em>EDIT 2</em></strong></p> <p>i have 2 changes </p> <pre><code>my $pid = $pm-&gt;start ; # do the fork </code></pre> <p>and <code>$$</code> for process id </p> <pre> 21892 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-windows.exe is done 21893 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-windows.exe is done 21892 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-macosx.dmg is done 23120 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3D-2.1-macosx.dmg is done 21892 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3DViewer-2.1.zip is done 23146 = http://prdownloads.sourceforge.net/sweethome3d/SweetHome3DViewer-2.1.zip is done </pre> <p>But now I am getting 2 twice. Why I am getting this? </p>
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    1. USjoe
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      1. POHow do I get the child process id in Parallel::ForkManager?
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    1. COJust a guess but perhaps Parallel:ForkManager is reusing the process since the download is complete?
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      1. POHow do I get the child process id in Parallel::ForkManager?
      1. USNic Strong
    2. COScrub that last comment, the $pm->finish should exit the child process. But since you dropped the 'and next' from the start call the parent process is also running the download as well. I am guessing 21892 is the pid of the parent process which will run through the loop multiple times.
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      1. USNic Strong
    3. CO@nic String - Add this information into ur answer then i will accept your answer :-)
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