Embedded Software Engineer Question:
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Tell me what is difference between binary semaphore and mutex?
Answer:
The differences between binary semaphore and mutex are as follows -
☛ Mutual exclusion and synchronization can be used by binary semaphore while mutex is used only for mutual exclusion.
☛ A mutex can be released by the same thread which acquired it. Semaphore values can be changed by other thread also.
☛ From an ISR, a mutex can not be used.
☛ The advantage of semaphores is that, they can be used to synchronize two unrelated processes trying to access the same resource.
☛ Semaphores can act as mutex, but the opposite is not possible.
☛ Mutual exclusion and synchronization can be used by binary semaphore while mutex is used only for mutual exclusion.
☛ A mutex can be released by the same thread which acquired it. Semaphore values can be changed by other thread also.
☛ From an ISR, a mutex can not be used.
☛ The advantage of semaphores is that, they can be used to synchronize two unrelated processes trying to access the same resource.
☛ Semaphores can act as mutex, but the opposite is not possible.
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