1Test2::Require::Fork(3)User Contributed Perl DocumentatioTnest2::Require::Fork(3)
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NAME

6       Test2::Require::Fork - Skip a test file unless the system supports
7       forking
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DESCRIPTION

10       It is fairly common to write tests that need to fork. Not all systems
11       support forking. This library does the hard work of checking if forking
12       is supported on the current system. If forking is not supported then
13       this will skip all tests and exit true.
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SYNOPSIS

16           use Test2::Require::Fork;
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18           ... Code that forks ...
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EXPLANATION

21       Checking if the current system supports forking is not simple. Here is
22       an example of how to do it:
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24           use Config;
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26           sub CAN_FORK {
27               return 1 if $Config{d_fork};
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29               # Some platforms use ithreads to mimic forking
30               return 0 unless $^O eq 'MSWin32' || $^O eq 'NetWare';
31               return 0 unless $Config{useithreads};
32               return 0 unless $Config{ccflags} =~ /-DPERL_IMPLICIT_SYS/;
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34               # Threads are not reliable before 5.008001
35               return 0 unless $] >= 5.008001;
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37               # Devel::Cover currently breaks with threads
38               return 0 if $INC{'Devel/Cover.pm'};
39               return 1;
40           }
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42       Duplicating this non-trivial code in all tests that need to fork is
43       error-prone. It is easy to forget bits, or get it wrong. On top of
44       these checks, you also need to tell the harness that no tests should
45       run and why.
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SEE ALSO

48       Test2::Require::CanReallyfork
49           Similar to this module, but will skip on any perl that only has
50           fork emulation.
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52       Test2::Require::CanThread
53           Skip the test file if the system does not support threads.
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SOURCE

56       The source code repository for Test2-Suite can be found at
57       https://github.com/Test-More/Test2-Suite/.
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MAINTAINERS

60       Chad Granum <exodist@cpan.org>
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AUTHORS

63       Chad Granum <exodist@cpan.org>
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66       Copyright 2018 Chad Granum <exodist@cpan.org>.
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68       This program is free software; you can redistribute it and/or modify it
69       under the same terms as Perl itself.
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71       See http://dev.perl.org/licenses/
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75perl v5.34.0                      2021-11-16           Test2::Require::Fork(3)
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