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Summary: dispatch_semaphore_wait with DISPATCH_TIME_NOW don't wait for the semaphore. It just test whether there's a signal and return the result. So the line "dispatch_semaphore_wait(semaphore, DISPATCH_TIME_NOW);" does nothing here. It seems like a bug, but each executing in js thread will be queued, so it's safe to remove the unused semaphore instead of wait for it. Closes https://github.com/facebook/react-native/pull/1915 Github Author: DengYun <tdzl2003@gmail.com>