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.\"
.IX Title "Test2::Require::Threads 3perl"
.TH Test2::Require::Threads 3perl 2024-09-01 "perl v5.40.0" "Perl Programmers Reference Guide"
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.SH NAME
Test2::Require::Threads \- Skip a test file unless the system supports threading
.SH DESCRIPTION
.IX Header "DESCRIPTION"
It is fairly common to write tests that need to use threads. Not all systems
support threads. This library does the hard work of checking if threading is
supported on the current system. If threading is not supported then this will
skip all tests and exit true.
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&    use Test2::Require::Threads;
\&
\&    ... Code that uses threads ...
.Ve
.SH EXPLANATION
.IX Header "EXPLANATION"
Checking if the current system supports threading is not simple, here is an
example of how to do it:
.PP
.Vb 1
\&    use Config;
\&
\&    sub CAN_THREAD {
\&        # Threads are not reliable before 5.008001
\&        return 0 unless $] >= 5.008001;
\&        return 0 unless $Config{\*(Aquseithreads\*(Aq};
\&
\&        # Devel::Cover currently breaks with threads
\&        return 0 if $INC{\*(AqDevel/Cover.pm\*(Aq};
\&        return 1;
\&    }
.Ve
.PP
Duplicating this non-trivial code in all tests that need to use threads is
error-prone. It is easy to forget bits, or get it wrong. On top of these checks you
also need to tell the harness that no tests should run and why.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP Test2::Require::CanFork 4
.IX Item "Test2::Require::CanFork"
Skip the test file if the system does not support forking.
.IP Test2 4
.IX Item "Test2"
Test2::Require::Threads uses Test2 under the hood.
.SH SOURCE
.IX Header "SOURCE"
The source code repository for Test2\-Suite can be found at
\&\fIhttps://github.com/Test\-More/Test2\-Suite/\fR.
.SH MAINTAINERS
.IX Header "MAINTAINERS"
.IP "Chad Granum <exodist@cpan.org>" 4
.IX Item "Chad Granum <exodist@cpan.org>"
.SH AUTHORS
.IX Header "AUTHORS"
.PD 0
.IP "Chad Granum <exodist@cpan.org>" 4
.IX Item "Chad Granum <exodist@cpan.org>"
.PD
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2018 Chad Granum <exodist@cpan.org>.
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.PP
See \fIhttp://dev.perl.org/licenses/\fR