Question: Synchronization within monitors uses condition variables and two special operations, wait and signal. A more general form of synchronization would be to have a single

Synchronization within monitors uses condition variables and two special operations, wait and signal. A more general form of synchronization would be to have a single primitive, waituntil, that had an arbitrary Boolean predicate as parameter. Thus, one could say, for example,
waituntil x < 0 or y + z < n
The signal primitive would no longer be needed. This scheme is clearly more general than that of Hoare or Brinch Hansen, but it is not used. Why not?

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