GCD Pending Repair

When you append a large amount of processing to the dispatch queue, sometimes you do not want to perform the appended processing during the append process. When a column is intercepted by block, some processing can affect the result of the calculation.

In this case, you can just suspend the dispatch Queue. When execution is in recovery.

The Dispatch_suspend function suspends the specified dispatch queue.

dispatch_suspend (queue);

The Dispatch_resume function restores the specified dispatch queue.

dispatch_resume (queue);

These functions have no effect on the processing that has been performed. After suspending, processing that is appended to the dispatch Queue but not yet executed is stopped after this. Recovery allows these processes to be carried out.

GCD Pending Repair