TEST2::MANUAL::ANATOMY::IPC(3pm)

📦
version 5.42.3 · 16 versions
, in alpine 3.24

🎀 NAME 🎀

hey bestie 💖 welcome to Test2::Manual::Anatomy::IPC(3pm) from the Perl Programmers Reference Guide — it's the manual for the IPC system, and yes, it's giving documentation but make it cute. ✨

💅 DESCRIPTION 💅

This document describes the IPC system. That's it, that's the whole job, and it ate. 💅

🌸 WHAT IS THE IPC SYSTEM 🌸

okay so the IPC system is activated by loading Test2::IPC. That makes hubs process/thread aware, and makes them forward events along to the parent process/thread as necessary. no cap. 🦋

🔥 HOW DOES THE IPC SYSTEM AFFECT EVERYTHING? 🔥

So 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. And if a hub has an IPC driver instance, it will use it to forward events to parent processes and threads. fr fr. 💀

🧚 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. iykyk. 💖

⭐ 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. literal speed magic, but make it factual ✨.

🦋 SEE ALSO 🦋

  • Test2::Manual — 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 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/.

okay that's the whole page, bestie. this was the Test2::...omy::IPC(3pm) page, from perl v5.42.3, dated 2026-11-03 — mwah, go be iconic with your IPC 💋💖

📦 where this page comes from