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What is the difference between mutex and semaphore?
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Answer Posted / rufus v. smith
A semaphore can be claimed a preset number of times, and when this number is reached, additional claims are blocked/denied until there is a release.
A binary semaphore has a count of 1. However, this does NOT make it a mutex.
A mutex is thread-aware. Once claimed, other claims (by other threads) will be blocked/denied. However, the same thread may claim it repeatedly and not be blocked (it must be released the same number of times).
For a binary semaphore, a second claim, even from the same thread, WILL block (not a good situation if from the same thread, make sure to timeout the request)
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