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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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