libfringe/README.md

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# libfringe
libfringe is a low-level green threading library for Rust.
It's usable in freestanding environments (like kernels),
but it can also provide an easy-to-use stack allocator using
your operating system's memory mapping facility.
## Performance
libfringe does context switches in 3.5ns flat on x86_64!
```
test swap ... bench: 7 ns/iter (+/- 0)
```
…and on x86, a mere 2.5ns!
```
test swap ... bench: 5 ns/iter (+/- 1)
```
## Limitations
libfringe currently doesn't work on anything but x86 and x86_64,
and is untested on anything but Linux.
## Installation
libfringe is a [Cargo](https://crates.io) package.
It's not stable software yet, so you'll have to use it as a git dependency.
Add this to your `Cargo.toml`:
```toml
[dependencies.fringe]
git = "https://github.com/edef1c/libfringe.git"
```
### Feature flags
[Cargo's feature flags]: http://doc.crates.io/manifest.html#the-[features]-section
libfringe provides several optional features through [Cargo's feature flags].
Currently, all of them are enabled by default.
#### `valgrind`
[Valgrind]: http://valgrind.org
[Valgrind] integration. libfringe will register context stacks with Valgrind.
#### `os`
[Built-in stack allocator]: https://edef1c.github.io/libfringe/fringe/struct.OsStack.html
[Built-in stack allocator] using your your operating system's anonymous memory mapping facility.
Currently only available for Unix.