[go-nuts] Workaround for missing RWMutex.Try*Lock()

[Liam Breck]

I have a problem that is trivially solved via

door sync.RWMutex

func Reader() T {
   if !door.TryRLock() { // missing in stdlib :-(
      return busy
   }
   defer door.RUnlock()
   ...
}

func Writer() {
   door.Lock()
   defer door.Unlock()
   ...
}

How does one achieve this in Go?

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