Test2::Manual::Anatomy::IPC(3) User Contributed Perl Documentation
NAME
Test2::Manual::Anatomy::IPC - Manual for the IPC system.
DESCRIPTION
This document describes the IPC system.
WHAT IS THE IPC SYSTEM
The IPC system is activated by loading Test2::IPC. This makes hubs
process/thread aware, and makes them forward events along to the parent
process/thread as necessary.
HOW DOES THE IPC SYSTEM AFFECT EVERYTHING?
Test2::API and Test2::API::Instance have some behaviors that trigger if
Test2::IPC is loaded before the global state is initialized. Mainly an
IPC driver will be initiated and stored in the global state.
If an IPC driver is initialized then all hubs will be initialized with
a reference to the driver instance. If a hub has an IPC driver instance
it will use it to forward events to parent processes and threads.
WHAT DOES AN IPC DRIVER DO?
An Test2::IPC::Driver provides a way to send event data to a
destination process+thread+hub (or to all globally). The driver must
also provide a way for a process/thread/hub to read in any pending
events that have been sent to it.
HOW DOES THE DEFAULT IPC DRIVER WORK?
The default IPC driver is Test2::IPC::Driver::Files. This default
driver, when initialized, starts by creating a temporary directory. Any
time an event needs to be sent to another process/thread/hub, the event
will be written to a file using Storable. The file is written with the
destination process, thread, and hub as part of the filename. All hubs
will regularly check for pending IPC events and will process them.
This driver is further optimized using a small chunk of SHM. Any time a
new event is sent via IPC the shm is updated to have a new value. Hubs
will not bother checking for new IPC events unless the shm value has
changed since their last poll. A result of this is that the IPC system
is surprisingly fast, and does not waste time polling the hard drive
when there are no pending events.
SEE ALSO
Test2::Manual(3) - Primary index of the manual.
SOURCE
The source code repository for Test2-Manual can be found at
https://github.com/Test-More/test-more/.
MAINTAINERS
Chad Granum <exodist@cpan.org>
AUTHORS
Chad Granum <exodist@cpan.org>
COPYRIGHT
Copyright 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/
perl v5.34.3 2025-03-30 Test2::Manual::Anatomy::IPC(3)
test-simple 1.302.210 - Generated Tue Apr 1 18:38:35 CDT 2025