OS X 10.10.3 Xcode 6.3.1
I need to limit a GCD concurrent queue to a specific number of concurrently
executing tasks (less than the number of cores available). The only way I can
get this to work is by adding "external plumbing" in the form of semaphores to
the dispatch invocation:
dispatch_queue_t gcdConcQueue = dispatch_queue_create("GCDProcQueue",
DISPATCH_QUEUE_CONCURRENT);
dispatch_semaphore_t concLimitSem = dispatch_semaphore_create(16);
. . .
dispatch_async(gcdConcQueue, ^{
dispatch_semaphore_wait(concLimitSem, DISPATCH_TIME_FOREVER);
// Concurrent DB access, etc . . .
dispatch_semaphore_signal(concLimitSem);
});
I was hoping an API like the following might be lurking around somewhere:
gcdConcQueue = dispatch_queue_create("GCDConcQueue",
DISPATCH_QUEUE_CONCURRENT, 16);
in which the queue manages itself behind the scenes. Is the semaphore approach
currently the (only) way to do this? Would this make sense as an API
enhancement? Am I overlooking something obvious?
-Carl
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