dispatch_queue_rb

https://github.com/marcus999/dispatch_queue_rb

DispatchQueueRb is a pure ruby implementation of Grand Central Dispatch concurrency primitives. It implements serial and concurrent queues, with synchronous, asynchronous, barrier and delayed dispatch methods. All queues dispatch methods support an optional dispatch groups to synchronize on completion of a group of tasks. It also provides a thread pool based concurrent queue, scaled to the number of available cpu cores, and used by default to schedule the actual work.