Why do we need 3 mutexes and not 2?

[harshit54]

So what's the point of the nextToAccessMutex?

Why can't we just do a lowPriorityMutex, highPriorityWaitGroup, dataAccessMutex with the locking patterns being:

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• High Priority Lock: highPriorityWaitGroup.Add(1), dataAccessMutex.Lock()
• High Priority Unlock: highPriorityWaitGroup.Done(), dataAccessMutex.Unlock()

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• Low Priority Lock: highPriorityWaitGroup.Done(), dataAccessMutex.Lock()
• Low Priority Unlock: dataAccessMutex.Unlock()