Binary Semaphores (Locks)
This lesson talks about a special kind of semaphores, the binary semaphores.
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We are now ready to use a semaphore. Our first use will be one with which we are already familiar: using a semaphore as a lock. Look at the code snippet below.
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sem_t m;sem_init(&m, 0, X); // initialize to X; what should X be?sem_wait(&m);// critical section heresem_post(&m);
Therein, you can see that we simply surround the critical section of interest with a sem_wait()/sem_post() pair. Critical to making this work, though, is the initial value of the semaphore m (initialized to X in the figure). What should X be?
… (Try thinking about ...
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