GCD Wrappers

gcd.swift

import Foundation

// Executes an array of blocks in parallel, but only returns after they're all done.

func parallel(blocks: [() -> ()]) {
    let group = dispatch_group_create()
    let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
    for block in blocks {
        dispatch_group_async(group, queue, block)
    }
    dispatch_group_wait(group, DISPATCH_TIME_FOREVER)
}

parallel(Array(1..<10).map { num in { print(num) } })
println("done")

You only need to 'import Dispatch', instead of the whole Foundation.