Semaphores are classic synchronization mechanisms, first described by Dijkstra i

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Semaphores are classic synchronization mechanisms, first described by Dijkstra in the mid-1960s. A semaphore is basically a counter with two operations. P and V. The P operation atomically decrements the counter when the result is non-negative; otherwise, the P operation waits. The V operation atomically increments the counter and wakes up a waiting thread, if any. In fact, semaphores and monitors are equally powerful (i.e., you can use each to implement the other). Assume a semaphore's counter is initialized to 1. Show how to implement semaphores using monitors. What is your monitor invariant in the implementation?

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