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Mutually exclusive semaphore 1. Priority reversal Priority reversal is a common problem when using binary semaphores. It is very common in the deprivable kernel, but it is not allowed in the real-time system, because it will destroy the expected sequence of tasks and may lead to serious consequences. An example of priority reversal is shown ...

1. Introduction Semaphore, a semaphore, holds a series of permissions. Each call to the acquire() method will consume a license, and each call to the release() method will return a license.Semaphore is usually used to limit the number of accesses to shared resources at the same time, which is often referred to as flow restriction.Semaphore sem ...