Create a new dealloc queue that is more efficient #931
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Source/ASRunLoopQueue.mm
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| currentQueue.clear(); | ||
| } | ||
| } | ||
| } |
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V1 is untouched except to remove the unused test_drain and _test_drain methods. The diff is hard to read in unified view =/
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CI is super flaky ……… seems like more fails than passes today. @garrettmoon is it worth like restarting the compy or something? That weird simulator bootstrap error =/ |
| NSParameterAssert(objectPtr != NULL); | ||
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| // Cast to CFType so we can manipulate retain count manually. | ||
| auto cfPtr = (CFTypeRef *)(void *)objectPtr; |
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Do we automatically get a +1 here?
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Nope, ARC never touches CFTypeRefs, so the retain count of the object doesn't change anywhere in here. What happens is, we "steal" their +1 and set their pointer to nil. So now they can't see or release the object.
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If we had used (__bridge_retained CFTypeRef) then ARC would have added a +1.
Source/ASRunLoopQueue.mm
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| _lock.lock(); | ||
| auto isFirstEntry = _queue.empty(); | ||
| // Push the pointer into our queue and clear their strong ref. | ||
| _queue.push_back(*cfPtr); |
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Adlai-Holler
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The current dealloc queue has a number of issues:
This diff creates a new implementation
ASDeallocQueueV2that solves these issues and is also a lot easier to reason about. The experimental implementation is triggered by the new flagASExperimentalDeallocQueue.