multi-semaphore
A counting, blocking semaphore extracted from rust 1.7.0.
Semaphores are a form of atomic counter where access is only granted if the counter is a positive value. This library allows getting a count greater than 1--if a thread acquires 4 resources, the thread will block until the counter is 4 or greater. Each release will increment the counter and unblock any threads if necessary.
Usage
Add this to your Cargo.toml:
[dependencies]
multi-semaphore = "0.1"and if you are using an older version of rust, add this to your crate root:
extern crate multi_semaphore;Examples
use multi_semaphore::Semaphore;
// Create a semaphore that represents 5 resources
let sem = Semaphore::new(5);
// Acquire one of the resources
sem.acquire();
// Acquire one of the resources for a limited period of time
{
let _guard = sem.access();
// or
let _guard = sem.access_many(8);
// ...
} // resources are released here
// Release our initially acquired resource
sem.release();
// or
sem.release_many(8);License
Unless otherwise noted, all code, tests, and docs are © 2014 The Rust Project Developers and dual-licensed under the Apache 2.0 and MIT licenses. See the copyright declaration at the top of src/lib.rs for more.