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Andreas Kling 50677bf806 Kernel: Refactor scheduler to use dynamic thread priorities
Threads now have numeric priorities with a base priority in the 1-99
range.

Whenever a runnable thread is *not* scheduled, its effective priority
is incremented by 1. This is tracked in Thread::m_extra_priority.
The effective priority of a thread is m_priority + m_extra_priority.

When a runnable thread *is* scheduled, its m_extra_priority is reset to
zero and the effective priority returns to base.

This means that lower-priority threads will always eventually get
scheduled to run, once its effective priority becomes high enough to
exceed the base priority of threads "above" it.

The previous values for ThreadPriority (Low, Normal and High) are now
replaced as follows:

    Low -> 10
    Normal -> 30
    High -> 50

In other words, it will take 20 ticks for a "Low" priority thread to
get to "Normal" effective priority, and another 20 to reach "High".

This is not perfect, and I've used some quite naive data structures,
but I think the mechanism will allow us to build various new and
interesting optimizations, and we can figure out better data structures
later on. :^)
2019-12-30 18:46:17 +01:00
.github Meta: Add GitHub Sponsors to funding options 2019-11-02 23:32:34 +01:00
AK AK: Use stack buffers in String::number() to avoid some malloc() calls 2019-12-30 14:52:27 +01:00
Applications Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Base Base: Remove misplaced backtick in syscall(1) 2019-12-30 14:15:18 +01:00
Demos Build: support library and generator dependencies 2019-12-25 10:11:09 +01:00
DevTools LibIPC: Let's start building custom message codecs for LibIPC 2019-12-30 02:41:45 +01:00
Documentation Meta: Update ReadMe and move build instructions to a separate document 2019-12-29 16:23:50 +01:00
Games Build: support library and generator dependencies 2019-12-25 10:11:09 +01:00
Kernel Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Libraries Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
MenuApplets Clock.MenuApplet: Only wake up once per second 2019-12-29 21:18:07 +01:00
Meta Meta: refresh-serenity-qtcreator.sh now checks if SERENITY_ROOT is set 2019-12-24 11:12:00 +01:00
Ports Ports: Update GCC patch to match our toolchain 2019-12-30 00:36:37 +01:00
Servers Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
Shell Build: support library and generator dependencies 2019-12-25 10:11:09 +01:00
Toolchain Toolchain: Fix building binutils on macOS with --enable-shared 2019-12-28 21:08:04 +01:00
Userland Kernel: Refactor scheduler to use dynamic thread priorities 2019-12-30 18:46:17 +01:00
.clang-format Meta: Tweak .clang-format to not wrap braces after enums. 2019-06-07 17:13:23 +02:00
.gitignore Meta: Add ccls-cache to gitignore 2019-12-24 02:19:59 +01:00
.travis.yml Travis: We don't have UseIt.sh anymore :^) 2019-12-21 00:19:49 +01:00
CODE_OF_CONDUCT.md Meta: Move code of conduct (lol) to a separate file 2019-10-23 10:05:06 +02:00
CONTRIBUTING.md Meta: Remove CoC (lol) from CONTRIBUTING.md since it has its own file 2019-10-23 12:19:41 +02:00
INSTALL.md Meta: Update install guide with instructions for booting into text mode (#758) 2019-11-11 13:11:00 +01:00
LICENSE Let's go with a 2-clause BSD license. 2019-04-15 14:04:23 +02:00
Makefile Build: go back to ordering SUBDIRS by their usefulness 2019-12-28 21:09:33 +01:00
Makefile.common Build: wrap make invocations with flock(1) 2019-12-28 21:09:33 +01:00
Makefile.subdir Build: wrap make invocations with flock(1) 2019-12-28 21:09:33 +01:00
ReadMe.md Meta: Fix typo in ReadMe 2019-12-29 16:25:06 +01:00

SerenityOS

Graphical Unix-like operating system for x86 computers.

Travis CI status

About

SerenityOS is a love letter to '90s user interfaces with a custom Unix-like core. It flatters with sincerity by stealing beautiful ideas from various other systems.

Roughly speaking, the goal is a marriage between the aesthetic of late-1990s productivity software and the power-user accessibility of late-2000s *nix. This is a system by me, for me, based on the things I like.

If you like some of the same things, you are welcome to join the project. It would be great to one day change the above to say "this is a system by us, for us, based on the things we like." :^)

I regularly post raw hacking sessions and demos on my YouTube channel.

Sometimes I write about the system on my github.io blog.

I'm also on Patreon and GitHub Sponsors if you would like to show some support that way.

Screenshot

Screenshot as of 1133aca

Current features (all under development, some more mature than others)

  • Pre-emptive multitasking
  • Multithreading
  • Compositing window server
  • IPv4 networking with ARP, TCP, UDP and ICMP
  • ext2 filesystem
  • Unix-like libc and userland
  • POSIX signals
  • Shell with pipes and I/O redirection
  • mmap()
  • Purgeable memory
  • /proc filesystem
  • Local sockets
  • Pseudoterminals (with /dev/pts filesystem)
  • Filesystem notifications
  • JSON framework
  • Low-level utility library (LibCore)
  • Mid-level 2D graphics library (LibDraw)
  • High-level GUI library (LibGUI)
  • HTML/CSS engine
  • Web browser
  • C++ IDE
  • Sampling profiler with GUI
  • Emojis (UTF-8)
  • HTTP downloads
  • SoundBlaster 16 driver
  • Software-mixing sound daemon
  • WAV playback
  • Simple desktop piano/synthesizer
  • Visual GUI design tool
  • PNG format support
  • Text editor
  • IRC client
  • Simple painting application
  • DNS lookup
  • Desktop games: Minesweeper and Snake
  • Color theming
  • Ports system (needs more packages!)
  • Other stuff I can't think of right now...

How do I build and run this?

See the SerenityOS build instructions

Wanna talk?

Come chat with us in #serenityos on the Freenode IRC network.

Author

Contributors

(And many more!) Feel free to append yourself here if you've made some sweet contributions. :)

License

SerenityOS is licensed under a 2-clause BSD license.