Augustin Cavalier
97a65a027d
This allows read spinlocks to be used in check_for_message and return_free_message. On a 4-core VM, there don't seem to often be concurrent readers (a counter I setup got only about 400-500 hits for booting up and starting a web browser, at most.) But on bare metal (i3, 2 cores x 2 hyperthreads) we get it a lot more: 30,000+ times during boot alone. Kernel map invalidation (with a hack to invalidate all every time) across boot-to-desktop takes a cumulative ~68.0ms before this change, and ~61.0ms after, on the bare metal system. (On the VM it's also lower after this change.) Presumably on systems with more CPUs it will get hit even more often still. So this optimization seems worth it.
Haiku
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Haiku is an open-source operating system that specifically targets personal computing. Inspired by the BeOS, Haiku is fast, simple to use, easy to learn and yet very powerful.
Goals
- Sensible defaults with minimal configuration required.
- Clean, clear, concise code.
- Unified desktop environment.
Trying Haiku
Haiku provides pre-built nightly images and release images. Haiku is compatible with a large variety of hardware, but in case you don't want to "take the plunge" and install Haiku on bare metal, you can install it on a virtual machine (VM) instead. If you've never used a VM before, you can follow one of the "Emulating Haiku" guides.
Compiling Haiku
See ReadMe.Compiling.
Contributing
Haiku is a meritocratic open source project with a large variety of tasks. Even if you can't write code, you can still help! Haiku needs designers, (technical) writers, translators, testers... Get involved and help out!
Contributing code
If you're submitting a patch to us, please make sure you're following the patch submitting guidelines.
If you're having trouble finding something in the source tree, you can use one of our web-based source code browsers:
- https://grok.nikisoft.one/opengrok/ (OpenGrok, provided by Niklas Poslovski)
- https://git.haiku-os.org/ (git, provided by Haiku, Inc.)
Contributing documentation
The main piece of documentation that still needs work are the API docs (found
in the tree at docs/user). Just find an undocumented class, write
documentation for it, and submit a patch.
Contributing translations
See wiki:i18n.
Contributing software ports
See HaikuPorts.
Contributing to our infrastructure
See Infrastructure.