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kleines Filmröllchen 125122a9ab LibAudio: Prevent racy eternal deadlock of the audio enqueue thread 
The audio enqueuer thread goes to sleep when there is no more audio data
present, and through normal Core::EventLoop events it can be woken up.
However, that waking up only happens when the thread is not currently
running, so that the wake-up events don't queue up and cause weirdness.
The atomic variable responsible for keeping track of whether the thread
is active can lead to a racy deadlock however, where the audio enqueuer
thread will never wake up again despite there being audio data to
enqueue. Consider this scenario:

- Main thread calls into async_enqueue. It detects that according to the
  atomic variable, the other thread is still running, skipping the event
  queue wake.
- Enqueuer thread has just finished playing the last chunk of audio and
  detects that there is no audio left. It enters the if block with the
  dbgln "Reached end of provided audio data..."
- Main thread enqueues audio, making the user sample queue non-empty.
- Enqueuer thread does not check this condition again, instead setting
  the atomic variable to indicate that it is not running. It exits into
  an event loop sleep.
- Main thread exits async_enqueue. The calling audio enqueuing system
  (see e.g. Piano, but all of them function similarly) will wait until
  the enqueuer thread has played enough samples before async_enqueue is
  called again. However, since the enqueuer thread will never play any
  audio, this condition is never fulfilled and audio playback deadlocks

This commit fixes that by allowing the event loop to not enqueue an
event that already exists, therefore overloading the audio enqueuer
event loop by at maximum one message in weird situations. We entirely
get rid of the atomic variable and the race condition is prevented.
2022-07-22 19:35:41 +01:00
.github Meta: Upgrade CI's prettier to version 2.7.1 2022-07-20 21:25:59 +01:00
AK AK: Add FixedArray::fill_with 2022-07-22 19:35:41 +01:00
Base PartitionEditor: Add the beginnings of a partition editor :^) 2022-07-21 20:13:44 +01:00
Documentation Documentation: Add a table of contents for Documentation 2022-07-21 17:35:36 +01:00
Kernel LibC: Implement pthread_cancel 2022-07-22 10:07:15 -07:00
Meta LibWeb/IDL: Handle passing ArrayBuffer to an IDL union type 2022-07-22 10:18:53 +01:00
Ports Ports: Update the CMake platform module from upstream 2022-07-22 17:33:28 +01:00
Tests Tests: Add a test for pthread_cancel 2022-07-22 10:07:15 -07:00
Toolchain Toolchain: Don't pass -lpthread when pthreads are requested 2022-07-19 11:00:35 +01:00
Userland LibAudio: Prevent racy eternal deadlock of the audio enqueue thread 2022-07-22 19:35:41 +01:00
.clang-format Meta: Update .clang-format to correct qualifier alignment 2022-04-01 21:24:45 +01:00
.clang-tidy Meta: Disable readability-use-anyofallof clang-tidy check 2022-01-09 23:29:57 -08:00
.gitattributes Repository: Protect port patches from CRLF/LF normalization 2022-01-12 01:08:38 +01:00
.gitignore man.serenityos.org: Simplify local builds 2021-10-22 19:49:28 +03:00
.mailmap Everywhere: Use my fairly new and shiny serenityos.org email :^) 2022-06-30 15:59:42 +01:00
.pre-commit-config.yaml Meta: Add a post-commit commit message linter hook 2021-05-02 16:28:01 +02:00
.prettierignore CI: Bump prettier to latest version (2.4.1) 2021-11-21 01:18:23 +00:00
.prettierrc Meta: Move prettier config files to the root of the repository 2020-08-24 18:21:33 +02:00
azure-pipelines.yml CI: Disallow test failures on macOS Lagom :^) 2022-01-14 22:39:06 +01:00
CMakeLists.txt Everywhere: Fully remove the separate LibPthread directory 2022-07-19 11:00:35 +01:00
CONTRIBUTING.md Meta: Add Sam Atkins to list of project maintainers :^) 2022-06-15 17:36:04 +02:00
LICENSE Meta: Update year range in LICENSE :^) 2022-01-02 18:08:02 +01:00
README.md Docs: Add kleines Filmröllchen's YouTube-channel 2022-07-04 14:50:07 +02:00
SECURITY.md Meta: Add a security policy 2022-06-29 03:29:27 +00:00

README.md

SerenityOS

Graphical Unix-like operating system for x86 computers.

GitHub Actions Status Azure DevOps Status Fuzzing Status Sonar Cube Static Analysis Discord

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 us, for us, based on the things we like.

You can watch videos of the system being developed on YouTube:

FAQ: Frequently Asked Questions

Screenshot

Screenshot as of b36968c.png

Features

  • Modern x86 32-bit and 64-bit kernel with pre-emptive multi-threading
  • Browser with JavaScript, WebAssembly, and more (check the spec compliance for JS, CSS, and WASM)
  • Security features (hardware protections, limited userland capabilities, W^X memory, pledge & unveil, (K)ASLR, OOM-resistance, web-content isolation, state-of-the-art TLS algorithms, ...)
  • System services (WindowServer, LoginServer, AudioServer, WebServer, RequestServer, CrashServer, ...) and modern IPC
  • Good POSIX compatibility (LibC, Shell, syscalls, signals, pseudoterminals, filesystem notifications, standard Unix utilities, ...)
  • POSIX-like virtual file systems (/proc, /dev, /sys, /tmp, ...) and ext2 file system
  • Network stack and applications with support for IPv4, TCP, UDP; DNS, HTTP, Gemini, IMAP, NTP
  • Profiling, debugging and other development tools (Kernel-supported profiling, detailed program analysis with software emulation in UserspaceEmulator, CrashReporter, interactive GUI playground, HexEditor, HackStudio IDE for C++ and more)
  • Libraries for everything from cryptography to OpenGL, audio, JavaScript, GUI, playing chess, ...
  • Support for many common and uncommon file formats (PNG, JPEG, GIF, MP3, WAV, FLAC, ZIP, TAR, PDF, QOI, Gemini, ...)
  • Unified style and design philosophy, flexible theming system, custom (bitmap and vector) fonts
  • Games (Solitaire, Minesweeper, 2048, chess, Conway's Game of Life, ...) and demos (CatDog, Starfield, Eyes, mandelbrot set, WidgetGallery, ...)
  • Every-day GUI programs and utilities (Spreadsheet with JavaScript, TextEditor, Terminal, PixelPaint, various multimedia viewers and players, Mail, Assistant, Calculator, ...)

... and all of the above are right in this repository, no extra dependencies, built from-scratch by us :^)

Additionally, there are over two hundred ports of popular open-source software, including games, compilers, Unix tools, multimedia apps and more.

How do I read the documentation?

Man pages are available online at man.serenityos.org. These pages are generated from the Markdown source files in Base/usr/share/man and updated automatically.

When running SerenityOS you can use man for the terminal interface, or help for the GUI.

Code-related documentation can be found in the documentation folder.

How do I build and run this?

See the SerenityOS build instructions. Serenity runs on Linux, macOS (aarch64 might be a challenge), Windows (with WSL2) and many other *Nixes with hardware or software virtualization.

Get in touch and participate!

Join our Discord server: SerenityOS Discord

Before opening an issue, please see the issue policy.

A general guide for contributing can be found in CONTRIBUTING.md.

Authors

And many more! See here for a full contributor list. The people listed above have landed more than 100 commits in the project. :^)

License

SerenityOS is licensed under a 2-clause BSD license.