Test2:...rrency(3perl) Perl Programmers Reference Guide Test2:...rrency(3perl)
NAME
Test2::Manual::Concurrency - Documentation for Concurrency support.
FORKING
Test2
Test2 supports forking. For forking to work you need to load Test2::IPC.
Test::Builder
Test::Builder Did not used to support forking, but now that it is based
on Test2 it does. Test2::IPC must be loaded just as with Test2.
Test2::Suite
Test2::Suite tools should all work fine with true forking unless
otherwise noted. Pseudo-fork via threads (Windows and a few others) is
not supported, but may work.
Patches will be accepted to repair any pseudo-fork issues, but for these
to be used or tested they must be requested. Fork tests should not run
on pseudo-fork systems unless they are requested with an environment
var, or the AUTHOR_TESTING var. Pseudo-fork is fragile, and we do not
want to block install due to a pseudo-fork flaw.
Test::SharedFork
Test::SharedFork is currently support and maintained, though it is no
longer necessary thanks to Test2::IPC. If usage ever drops off then the
module may be deprecated, but for now the policy is to not let it break.
Currently it simply loads Test2::IPC if it can, and falls back to the
old methods on legacy installs.
Others
Individual authors are free to support or not support forking as they
see fit.
THREADING
Note This only applies to ithreads.
Test2
The core of Test2 supports threading so long as Test2::IPC is loaded.
Basic threading support (making sure events make it to the parent
thread) is fully supported, and must not be broken.
Some times perl installs have broken threads (Some 5.10 versions
compiled on newer gcc's will segv by simply starting a thread). This is
beyond Test2's control, and not solvable in Test2. That said we strive
for basic threading support on perl 5.8.1+.
If Test2 fails for threads on any perl 5.8 or above, and it is
reasonably possible for Test2 to work around the issue, it should.
(Patches and bug reports welcome).
Test::Builder
Test::Builder has had thread support for a long time. With Test2 the
mechanism for thread support was switched to Test2::IPC. Test::Builder
should still support threads as much as it did before the switch to
Test2. Support includes auto-enabling thread support if threads is
loaded before Test::Builder.
If there is a deviation between the new and old threading behavior then
it is a bug (unless the old behavior itself can be classified as a bug.)
Please report (or patch!) any such threading issues.
Test2::Suite
Tools in Test2::Suite have minimal threading support. Most of these
tools do not care/notice threading and simply work because Test2::IPC
handles it. Feel free to report any thread related bugs in
Test2::Suite. Be aware though that these tools are not legacy, and have
no pre-existing thread support, we reserve the right to refuse adding
thread support to them.
Test2::Workflow
Test2::Workflow has been merged into Test2::Suite, so it gets addressed
by this policy.
Test2::Workflow has thread support, but you must ask for it. Thread
tests for Test2::Workflow do not event run without setting either the
AUTHOR_TESTING env var, or the T2_DO_THREAD_TESTS env var.
To use threads with Test2::Workflow you must set the
T2_WORKFLOW_USE_THREADS env var.
If you do rely on threads with Test2::Workflow and find a bug please
report it, but it will be given an ultra-low priority. Merging patches
that fix threading issues will be given normal priority.
SEE ALSO
Test2 - Test2 itself.
Test2::Suite - Initial tools built using Test2.
Test2::Manual - Primary index of the manual.
SOURCE
The source code repository for Test2-Manual can be found at
https://github.com/Test-More/Test2-Suite/.
MAINTAINERS
Chad Granum <exodist@cpan.org>
AUTHORS
Chad Granum <exodist@cpan.org>
COPYRIGHT
Copyright 2018 Chad Granum <exodist@cpan.org>.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See http://dev.perl.org/licenses/
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