abdd5aa08a
This patch introduces three separate thread queues, one for each thread priority available to userspace (Low, Normal and High.) Each queue operates in a round-robin fashion, but we now always prefer to schedule the highest priority thread that currently wants to run. There are tons of tweaks and improvements that we can and should make to this mechanism, but I think this is a step in the right direction. This makes WindowServer significantly more responsive while one of its clients is burning CPU. :^) |
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Serenity
Graphical Unix-like operating system for x86 computers.
About
I always wondered what it would be like to write my own operating system, but I never took it seriously. Until now.
Serenity 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.
There's also a Patreon if you would like to show some support that way.
Screenshot
Current features (all under development)
- 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()
- /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
- 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
- Ports system (needs more packages!)
- Other stuff I can't think of right now...
How do I build and run this?
Make sure you have all the dependencies installed:
sudo apt install build-essential curl libmpfr-dev libmpc-dev libgmp-dev e2fsprogs qemu-system-i386 qemu-utils
Ensure your gcc version is >= 8 with gcc --version. Otherwise, install it (on Ubuntu) with:
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get install gcc-8 g++-8
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 800 --slave /usr/bin/g++ g++ /usr/bin/g++-8
Go into the Toolchain/ directory and run the BuildIt.sh script.
Once you've built the toolchain, go into the Kernel/ directory, then run
./makeall.sh, and if nothing breaks too much, take it for a spin by using
./run.
You can vastly reduce the build time of successive rebuilds of Serenity by installing ccache and exporting PRE_CXX=ccache
Bare curious users may even consider sourcing suitable hardware to install Serenity on a physical PC.
Later on, when you git pull to get the latest changes, there's no need to rebuild the toolchain. You can simply rerun ./makeall.sh in the Kernel/ directory and you'll be good to ./run again.
IRC
Come chat in #serenityos on the Freenode IRC network.
Author
- Andreas Kling - awesomekling
Contributors
(And many more!) Feel free to append yourself here if you've made some sweet contributions. :)
License
Serenity is licensed under a 2-clause BSD license.