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Most systems (Linux, OpenBSD) adjust 0.5 ms per second, or 0.5 us per 1 ms tick. That is, the clock is sped up or slowed down by at most 0.05%. This means adjusting the clock by 1 s takes 2000 s, and the clock an be adjusted by at most 1.8 s per hour. FreeBSD adjusts 5 ms per second if the remaining time adjustment is >= 1 s (0.5%) , else it adjusts by 0.5 ms as well. This allows adjusting by (almost) 18 s per hour. Since Serenity OS can lose more than 22 s per hour (#3429), this picks an adjustment rate up to 1% for now. This allows us to adjust up to 36s per hour, which should be sufficient to adjust the clock fast enough to keep up with how much time the clock currently loses. Once we have a fancier NTP implementation that can adjust tick rate in addition to offset, we can think about reducing this. adjtime is a bit old-school and most current POSIX-y OSs instead implement adjtimex/ntp_adjtime, but a) we have to start somewhere b) ntp_adjtime() is a fairly gnarly API. OpenBSD's adjfreq looks like it might provide similar functionality with a nicer API. But before worrying about all this, it's probably a good idea to get to a place where the kernel APIs are (barely) good enough so that we can write an ntp service, and once we have that we should write a way to automatically evaluate how well it keeps the time adjusted, and only then should we add improvements ot the adjustment mechanism. |
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SerenityOS
Graphical Unix-like operating system for x86 computers.
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
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 (ProtocolServer)
- 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)
- 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 (LibThread)
- 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 browsable outside of SerenityOS under Base/usr/share/man.
When running SerenityOS you can use man for the terminal interface, or help for the GUI interface.
How do I build and run this?
See the SerenityOS build instructions
Before opening an issue
Please see the issue policy.
Communication hubs
The main hub is #serenityos on the Freenode IRC network.
We also have a project mailing list: serenityos-dev.
Author
- Andreas Kling - awesomekling
Contributors
- Robin Burchell - rburchell
- Conrad Pankoff - deoxxa
- Sergey Bugaev - bugaevc
- Liav A - supercomputer7
- Linus Groh - linusg
- Ali Mohammad Pur - alimpfard
- Shannon Booth - shannonbooth
- Hüseyin ASLITÜRK - asliturk
- Matthew Olsson - mattco98
- Nico Weber - nico
- Brian Gianforcaro - bgianfo
- Ben Wiederhake - BenWiederhake
- Tom - tomuta
- Paul Scharnofske - asynts
- Itamar Shenhar - itamar8910
(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.