1Parallel::Pipes(3pm)  User Contributed Perl Documentation Parallel::Pipes(3pm)
2
3
4

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:
53
54       How can we synchronize our workers?
55           More precisely, how to detect our workers are ready or finished.
56
57       How can we communicate with our workers?
58           More precisely, how to collect results of tasks.
59
60       Parallel::Pipes tries to solve these problems with pipe(2) and
61       select(2).
62
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.
77
78
79
80perl v5.34.0                      2022-03-22              Parallel::Pipes(3pm)
Impressum