Question: Suppose a system has an atomic hardware instruction SHIFT, that does the follows: SHIFT ( int *A, *B ) { *B =*A; // ATOMICALLY *A

Suppose a system has an atomic hardware instruction SHIFT, that does the follows:

SHIFT ( int *A, *B ) { *B =*A; // ATOMICALLY *A = 0 }

A. Implement Dijkstra style semaphores with the shift instruction, that is, semaphores which utilize busy waiting.

B. Implement blocking semaphores using the shift instructions.

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