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can any one explain me the following thing...

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let m[0] ...m[4] be mutexes (binary semaphores) and p[0] and p[4] be processes ...suppose each process p[i] executes the following

wait(m[i]);wait(m[i+1]mode 4]);

................

release(m[i];release(m[(i+1)mod4]);

what is meaning of all these things?
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