1Parallel::Pipes(3pm)  User Contributed Perl Documentation Parallel::Pipes(3pm)
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NAME

6       Parallel::Pipes - parallel processing using pipe(2) for communication
7       and synchronization
8

SYNOPSIS

10         use Parallel::Pipes;
11
12         my $pipes = Parallel::Pipes->new(5, sub {
13           # this is a worker code
14           my $task = shift;
15           my $result = do_work($task);
16           return $result;
17         });
18
19         my $queue = Your::TaskQueue->new;
20         # wrap Your::TaskQueue->get
21         my $get; $get = sub {
22           my $queue = shift;
23           if (my @task = $queue->get) {
24             return @task;
25           }
26           if (my @written = $pipes->is_written) {
27             my @ready = $pipes->is_ready(@written);
28             $queue->register($_->read) for @ready;
29             return $queue->$get;
30           } else {
31             return;
32           }
33         };
34
35         while (my @task = $queue->$get) {
36           my @ready = $pipes->is_ready;
37           $queue->register($_->read) for grep $_->is_written, @ready;
38           my $min = List::Util::min($#task, $#ready);
39           for my $i (0..$min) {
40             # write tasks to pipes which are ready
41             $ready[$i]->write($task[$i]);
42           }
43         }
44
45         $pipes->close;
46

DESCRIPTION

48       NOTE: Parallel::Pipes provides low-level interfaces.  If you are
49       interested in using Parallel::Pipes, you may want to look at
50       Parallel::Pipes::App instead, which provides more friendly interfaces.
51
52       Parallel processing is essential, but it is also difficult:
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54       How can we synchronize our workers?
55           More precisely, how to detect our workers are ready or finished.
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57       How can we communicate with our workers?
58           More precisely, how to collect results of tasks.
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60       Parallel::Pipes tries to solve these problems with pipe(2) and
61       select(2).
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63       App::cpm, a fast CPAN module installer, uses Parallel::Pipes.  Please
64       look at App::cpm
65       <https://github.com/skaji/cpm/blob/master/lib/App/cpm/CLI.pm> or eg
66       directory <https://github.com/skaji/Parallel-Pipes/tree/main/eg> for
67       real world usages.
68

AUTHOR

70       Shoichi Kaji <skaji@cpan.org>
71

73       Copyright 2016 Shoichi Kaji <skaji@cpan.org>
74
75       This library is free software; you can redistribute it and/or modify it
76       under the same terms as Perl itself.
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80perl v5.34.0                      2022-03-22              Parallel::Pipes(3pm)
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