I would like to know why spin locks are used instead of semaphores inside an interrupt handler.
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I would like to know why spin locks are used instead of semaphores inside an interrupt handler.
Semaphores cause tasks to sleep on contention, which is unacceptable for interrupt handlers. Basically, for such a short and fast task (interrupt handling) the work carried out by the semaphore is overkill. Also, spinlocks can’t be held by more than one task.