Document Revision History

This table describes the changes to Concurrency Programming Guide.

2012-12-13Corrected explanation of dispatch queues.
2012-07-17Removed obsolete information about autorelease pool usage with operations.
2011-01-19Updated the code for manually executing operations to handle cancellation correctly.

Added information about using Objective-C objects in conjunction with dispatch queues.

2010-04-13Updated to reflect support for iOS.
2009-08-07Corrected the start method for the nonconcurrent operation object example.
2009-05-22New document that describes technologies for executing multiple code paths in a concurrent manner.