Re: question about forked processes writing to the same file
- From: xhoster@xxxxxxxxx
- Date: 17 Oct 2005 03:37:21 GMT
"it_says_BALLS_on_your forehead" <simon.chao@xxxxxxx> wrote:
> it_says_BALLS_on_your forehead wrote:
> > is this dangerous? for instance, is there ever a danger of race
> > conditions/locking/etc if i have:
> >
> > use strict; use warnings;
> > use Parallel::ForkManager;
> >
> > my $pm = Parallel::ForkManager->new(10);
> >
> > # assume @files contains 100 files that will be processed,
> > # and processing time could range from subseconds to hours
> >
> > my $out = 'results.txt';
> > for my $file (@files) {
> > $pm->start and next;
> >
> > # some code to process file
> > # blah blah blah
> >
> > open( my $fh_out, '>', $out ) or die "can't open $out: $!\n";
>
> Apologies... ^^^ should be '>>'
>
> > print $fh_out "$file\n";
> > close $fh_out;
> >
> > $pm->finish;
> > }
> > $pm->wait_all_children;
On Linux this is safe, provided the string $file is not more than a few
hundred bytes. On Windows, it is not safe (although probably safe
enough, provided this is just for progress monitoring)
Xho
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