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In GCD, is there a way to tell if the current queue is concurrent or not?
I’m current attempting to perform a delayed save on some managed object contexts but I need to make sure that the queue the code is currently executed on is thread-safe (in a synchronous queue).
If you actually have to determine whether or not the queue passed in to you is serial or concurrent, you’ve almost certainly designed things incorrectly. Typically, an API will hide an internal queue as an implementation detail (in your case, your shared object contexts) and then enqueue operations against its internal queue in order to achieve thread safety. When your API takes a block and a queue as parameters, however, then the assumption is that the passed-in block can be safely scheduled (async) against the passed-queue (when, say, an operation is complete) and the rest of the code is factored appropriately.