Optimize CountDownLatch #3
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Instead of using a new `DispatchQueue` for each `CountDownLatch`, which is expensive, use `NSCondition` and `AtomicInt`. The `AtomicInt` allows concurrent `countDown` and `await` checks, to help reduce contention and locking cost on the `NSCondition`.
rudro
approved these changes
May 2, 2018
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Instead of using a new
DispatchQueuefor eachCountDownLatch, which is expensive, useNSConditionandAtomicInt. TheAtomicIntallows concurrentcountDownandawaitchecks, to help reduce contention and locking cost on theNSCondition.