libfringe/README.md

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[![travis][travis-badge]][travis-url]
[![rustdoc][rustdoc-badge]][rustdoc-url]
[travis-badge]: https://img.shields.io/travis/edef1c/libfringe.svg?style=flat-square
[travis-url]: https://travis-ci.org/edef1c/libfringe
[rustdoc-badge]: https://img.shields.io/badge/docs-rustdoc-brightgreen.svg?style=flat-square
[rustdoc-url]: https://edef1c.github.io/libfringe
# 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
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libfringe does context switches in 3.5ns flat on x86_64!
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```
test swap ... bench: 7 ns/iter (+/- 0)
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```
…and on x86, a mere 2.5ns!
```
test swap ... bench: 5 ns/iter (+/- 1)
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```
## Limitations
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libfringe currently doesn't work on anything but x86 and x86_64,
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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.