Rust wrapper for Apple's Grand Central Dispatch (GCD).

GCD is an implementation of task parallelism that allows tasks to be submitted to queues where they are scheduled to execute.

For more information, see Apple's Grand Central Dispatch reference.

• Documentation: http://ssheldon.github.io/rust-objc/dispatch/
• Crate: https://crates.io/crates/dispatch

Serial Queues

Serial queues execute tasks serially in FIFO order. The application's main queue is serial and can be accessed through the Queue::main function.

use dispatch::{Queue, QueueAttribute};

let queue = Queue::create("com.example.rust", QueueAttribute::Serial);
queue.exec_async(|| println!("Hello"));
queue.exec_async(|| println!("World"));

Concurrent Queues

Concurrent dispatch queues execute tasks concurrently. GCD provides global concurrent queues that can be accessed through the Queue::global function.

Queue has two methods that can simplify processing data in parallel, for_each and map:

use dispatch::{Queue, QueuePriority};

let queue = Queue::global(QueuePriority::Default);

let mut nums = vec![1, 2];
queue.for_each(&mut nums, |x| *x += 1);
assert!(nums == [2, 3]);

let nums = queue.map(nums, |x| x.to_string());
assert!(nums[0] == "2");