forked from M-Labs/libfringe
63 lines
2.0 KiB
Markdown
63 lines
2.0 KiB
Markdown
[![travis][travis-badge]][travis-url]
|
|
[![rustdoc][rustdoc-badge]][rustdoc-url]
|
|
|
|
[travis-badge]: https://img.shields.io/travis/edef1c/libfringe/master.svg?style=flat-square&label=travis
|
|
[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 library implementing lightweight context switches,
|
|
without relying on kernel services. It can be used in hosted environments
|
|
(using `std`) as well as on bare metal (using `core`).
|
|
|
|
It provides high-level, safe abstractions:
|
|
* an implementation of internal iterators, also known as generators,
|
|
[Generator](https://edef1c.github.io/libfringe/fringe/generator/struct.Generator.html).
|
|
|
|
It also provides low-level, unsafe building blocks:
|
|
* a trait that can be implemented by stack allocators,
|
|
[Stack](https://edef1c.github.io/libfringe/fringe/struct.Stack.html);
|
|
* a stack allocator based on anonymous memory mappings with guard pages,
|
|
[OsStack](https://edef1c.github.io/libfringe/fringe/struct.OsStack.html).
|
|
|
|
## Performance
|
|
|
|
libfringe does context switches in 2.5ns flat on x86_64!
|
|
```
|
|
test swap ... bench: 5 ns/iter (+/- 1)
|
|
```
|
|
|
|
…and on x86:
|
|
|
|
```
|
|
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 some 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.
|