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This is __cxa_guard_acquire, __cxa_guard_release, and __cxa_guard_abort. We put these symbols in a 'fake' libstdc++ to trick gcc into thinking it has libstdc++. These symbols are necessary for C++ programs and not C programs, so, seems file. There's no way to tell gcc that, for example, the standard lib it should use is libc++ or libc. So, this is what we have for now. When threaded code enters a block that is trying to call the constructor for a block-scope static, the compiler will emit calls to these methods to handle the "call_once" nature of block-scope statics. The compiler creates a 64-bit guard variable, which it checks the first byte of to determine if the variable should be intialized or not. If the compiler-generated code reads that byte as a 0, it will call __cxa_guard_acquire to try and be the thread to call the constructor for the static variable. If the first byte is 1, it will assume that the variable's constructor was called, and go on to access it. __cxa_guard_acquire uses one of the 7 implementation defined bytes of the guard variable as an atomic 8 bit variable. To control a state machine that lets each entering thread know if they gained 'initialization rights', someone is working on the varaible, someone is working on the varaible and there's at least one thread waiting for it to be intialized, or if the variable was initialized and it's time to access it. We only store a 1 to the byte the compiler looks at in __cxa_guard_release, and use a futex to handle waiting. |
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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 handing (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 build and run this?
See the SerenityOS build instructions
Before opening an issue
Please see the issue policy.
Wanna chat?
Come hang out with us in #serenityos on the Freenode IRC network.
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
(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.