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Tom 7e77a2ec40 Everywhere: Improve CPU usage calculation 
As threads come and go, we can't simply account for how many time
slices the threads at any given point may have been using. We need to
also account for threads that have since disappeared. This means we
also need to track how many time slices we have expired globally.

However, because this doesn't account for context switches outside of
the system timer tick values may still be under-reported. To solve this
we will need to track more accurate time information on each context
switch.

This also fixes top's cpu usage calculation which was still based on
the number of context switches.

Fixes #6473
2021-07-18 22:08:26 +02:00
.github CI: Disallow spaces just before the separating colon in commit titles 2021-07-13 19:56:14 +01:00
AK AK: Add the at()/operator[]() getter to Utf32View 2021-07-18 21:10:55 +04:30
Base Base: Associate .profile extension with Profiler 2021-07-18 19:01:57 +02:00
Documentation Documentation: Remove '$' character from build instruction commands 2021-07-14 19:51:23 +02:00
Kernel Everywhere: Improve CPU usage calculation 2021-07-18 22:08:26 +02:00
Meta Meta: Remove unused bootloader_test target 2021-07-18 22:08:03 +02:00
Ports Ports: Add Launcher for Epsilon 2021-07-15 01:47:51 +02:00
Tests Tests: Make mmap test point to new kernel address too 2021-07-18 22:08:20 +02:00
Toolchain Toolchain: Use correct variable when deleting the QEMU tarball 2021-07-10 11:13:56 +01:00
Userland Everywhere: Improve CPU usage calculation 2021-07-18 22:08:26 +02:00
.clang-format Meta: Update .clang-format to not indent nested namespaces 2020-03-14 10:10:21 +01:00
.gitattributes Meta: Mark the other image file formats as binary in .gitattributes 2021-05-20 08:04:28 +02:00
.gitignore LibWasm+Meta: Implement instantiation/execution primitives in test-wasm 2021-05-21 00:15:23 +01:00
.mailmap Meta: Add my emails to .mailmap 2021-06-30 00:59:23 +04:30
.pre-commit-config.yaml Meta: Add a post-commit commit message linter hook 2021-05-02 16:28:01 +02:00
.prettierignore LibJS: Correct behaviour of direct vs. indirect eval 2021-06-23 09:38:33 +01:00
.prettierrc Meta: Move prettier config files to the root of the repository 2020-08-24 18:21:33 +02:00
CMakeLists.txt Kernel: Make new kernel build process work on macOS 2021-07-15 11:04:30 +02:00
CONTRIBUTING.md Meta: Update CONTRIBUTING.md 2021-07-09 10:18:24 +02:00
LICENSE Everywhere: Use "the SerenityOS developers." in copyright headers 2021-04-29 00:59:26 +02:00
README.md Meta: Add Daniel Bertalan to the contributors list :^) 2021-07-08 10:38:32 +02:00

README.md

SerenityOS

Graphical Unix-like operating system for x86 computers.

Build status Fuzzing Status 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.

I (Andreas) 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 0f85753.png

Kernel features

  • x86 (32-bit) kernel with pre-emptive multi-threading
  • Hardware protections (SMEP, SMAP, UMIP, NX, WP, TSD, ...)
  • IPv4 stack with ARP, TCP, UDP and ICMP protocols
  • ext2 filesystem
  • POSIX signals
  • Purgeable memory
  • /proc filesystem
  • Pseudoterminals (with /dev/pts filesystem)
  • Filesystem notifications
  • CPU and memory profiling
  • SoundBlaster 16 driver
  • VMWare/QEMU mouse integration

System services

  • Launch/session daemon (SystemServer)
  • Compositing window server (WindowServer)
  • Text console manager (TTYServer)
  • DNS client (LookupServer)
  • Network protocols server (RequestServer and WebSocket)
  • Software-mixing sound daemon (AudioServer)
  • Desktop notifications (NotificationServer)
  • HTTP server (WebServer)
  • Telnet server (TelnetServer)
  • DHCP client (DHCPClient)

Libraries

  • C++ templates and containers (AK)
  • Event loop and utilities (LibCore)
  • 2D graphics library (LibGfx)
  • OpenGL 1.x compatible library (LibGL)
  • GUI toolkit (LibGUI)
  • Cross-process communication library (LibIPC)
  • HTML/CSS engine (LibWeb)
  • JavaScript engine (LibJS)
  • Markdown (LibMarkdown)
  • Audio (LibAudio)
  • PCI database (LibPCIDB)
  • Terminal emulation (LibVT)
  • Out-of-process network protocol I/O (LibProtocol)
  • Mathematical functions (LibM)
  • ELF file handling (LibELF)
  • POSIX threading (LibPthread)
  • Higher-level threading (LibThreading)
  • Transport Layer Security (LibTLS)
  • HTTP and HTTPS (LibHTTP)

Userland features

  • Unix-like libc and userland
  • Shell with pipes and I/O redirection
  • On-line help system (both terminal and GUI variants)
  • Web browser (Browser)
  • C++ IDE (HackStudio)
  • IRC client
  • Desktop synthesizer (Piano)
  • Various desktop apps & games
  • Color themes

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.

How do I build and run this?

See the SerenityOS build instructions

Before opening an issue

Please see the issue policy.

FAQ: Frequently Asked Questions

Get in touch

Join our Discord server: SerenityOS Discord

Author

Contributors

(And many more!) The people listed above have landed more than 100 commits in the project. :^)

License

SerenityOS is licensed under a 2-clause BSD license.