1Test2::Manual::Anatomy:U:sIePrC(C3o)ntributed Perl DocumTeenstta2t:i:oMnanual::Anatomy::IPC(3)
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NAME

6       Test2::Manual::Anatomy::IPC - Manual for the IPC system.
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DESCRIPTION

9       This document describes the IPC system.
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WHAT IS THE IPC SYSTEM

12       The IPC system is activated by loading Test2::IPC. This makes hubs
13       process/thread aware, and makes them forward events along to the parent
14       process/thread as necessary.
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HOW DOES THE IPC SYSTEM EFFECT EVERYTHING?

17       Test2::API and Test2::API::Instance have some behaviors that trigger if
18       Test2::IPC is loaded before the global state is initialized. Mainly an
19       IPC driver will be initiated and stored in the global state.
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21       If an IPC driver is initialized then all hubs will be initialized with
22       a reference to the driver instance. If a hub has an IPC driver instance
23       it will use it to forward events to parent processes and threads.
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WHAT DOES AN IPC DRIVER DO?

26       An Test2::IPC::Driver provides a way to send event data to a
27       destination process+thread+hub (or to all globally). The driver must
28       also provide a way for a process/thread/hub to read in any pending
29       events that have been sent to it.
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HOW DOES THE DEFAULT IPC DRIVER WORK?

32       The default IPC driver is Test2::API::Driver::Files. This default
33       driver, when initialized, starts by creating a temporary directory. Any
34       time an event needs to be sent to another process/thread/hub, the event
35       will be written to a file using Storable. The file is written with the
36       destination process, thread, and hub as part of the filename. All hubs
37       will regularly check for pending IPC events and will process them.
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39       This driver is further optimized using a small chunk of SHM. Any time a
40       new event is sent via IPC the shm is updated to have a new value. Hubs
41       will not bother checking for new IPC events unless the shm value has
42       changed since their last poll. A result of this is that the IPC system
43       is surprisingly fast, and does not waste time polling the hard drive
44       when there are no pending events.
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SEE ALSO

47       Test2::Manual - Primary index of the manual.
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SOURCE

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

54       Chad Granum <exodist@cpan.org>
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AUTHORS

57       Chad Granum <exodist@cpan.org>
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60       Copyright 2018 Chad Granum <exodist@cpan.org>.
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62       This program is free software; you can redistribute it and/or modify it
63       under the same terms as Perl itself.
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65       See http://dev.perl.org/licenses/
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69perl v5.34.0                      2022-03-08    Test2::Manual::Anatomy::IPC(3)
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