func sync.runtime_SemacquireRWMutexR

2 uses

	sync (current package)
		runtime.go#L27: func runtime_SemacquireRWMutexR(s *uint32, lifo bool, skipframes int)
		rwmutex.go#L74: 		runtime_SemacquireRWMutexR(&rw.readerSem, false, 0)