"Victor A. Wagner, Jr." wrote:
I'm baffled that they want to penalize (time and space) those for whom a naked semaphore works. It's blatantly clear to anyone who's had to write a mutex that it's additional code on TOP of a semaphore.
Optimization stratergies aside (they are different for mutexes and semas) a binary semaphore can be used as "normal" POSIX mutex.
yes, binary semaphores may be implemented with a mutex (though I think
there is a subtle problem as POSIX mutex locks are owned, while semaphores are not).
But binary semaphore are only a (small) subclass of semaphores, and I'd
use semaphores mostly to represent value *and* lock, where the value's domain is larger than just 1/0.
Stefan
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