68 lines
2.4 KiB
Markdown
68 lines
2.4 KiB
Markdown
[![travis][travis-badge]][travis-url]
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[![appveyor][appveyor-badge]][appveyor-url]
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[![rustdoc][rustdoc-badge]][rustdoc-url]
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[travis-badge]: https://img.shields.io/travis/edef1c/libfringe/master.svg?style=flat-square&label=travis
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[travis-url]: https://travis-ci.org/edef1c/libfringe
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[appveyor-badge]: https://img.shields.io/appveyor/ci/edef1c/libfringe/master.svg?style=flat-square&label=appveyor
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[appveyor-url]: https://ci.appveyor.com/project/edef1c/libfringe
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[rustdoc-badge]: https://img.shields.io/badge/docs-rustdoc-brightgreen.svg?style=flat-square
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[rustdoc-url]: https://edef1c.github.io/libfringe
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# libfringe
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libfringe is a library implementing lightweight context switches,
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without relying on kernel services. It can be used in hosted environments
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(using `std`) as well as on bare metal (using `core`).
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It provides high-level, safe abstractions:
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* an implementation of internal iterators, also known as generators,
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[Generator](https://edef1c.github.io/libfringe/fringe/generator/struct.Generator.html).
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It also provides low-level, *very* unsafe building blocks:
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* a flexible, low-level context-swapping mechanism,
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[Context](https://edef1c.github.io/libfringe/fringe/struct.Context.html);
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* a trait that can be implemented by stack allocators,
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[Stack](https://edef1c.github.io/libfringe/fringe/struct.Stack.html);
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* a stack allocator based on anonymous memory mappings with guard pages,
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[OsStack](https://edef1c.github.io/libfringe/fringe/struct.OsStack.html).
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## Performance
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libfringe does context switches in 2.5ns flat on x86_64!
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```
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test swap ... bench: 5 ns/iter (+/- 1)
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```
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…and on x86:
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```
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test swap ... bench: 5 ns/iter (+/- 1)
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```
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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.
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## Installation
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libfringe is a [Cargo](https://crates.io) package.
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It's not stable software yet, so you'll have to use it as a git dependency.
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Add this to your `Cargo.toml`:
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```toml
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[dependencies.fringe]
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git = "https://github.com/edef1c/libfringe.git"
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```
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### Feature flags
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[Cargo's feature flags]: http://doc.crates.io/manifest.html#the-[features]-section
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libfringe provides some optional features through [Cargo's feature flags].
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Currently, all of them are enabled by default.
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#### `valgrind`
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[Valgrind]: http://valgrind.org
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[Valgrind] integration. libfringe will register context stacks with Valgrind.
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