Description: Semaphore (Semaphore), also known as signal lights, often in multi-threaded environment as synchronization and mutual exclusion mechanism. It is responsible for coordinating the various threads in order to ensure that they can correct and reasonable use of public resources. Semaphore is divided into two kinds of single and multiple values. Single-valued semaphore can only be one thread access, and multi-valued semaphore can be a number of threads available. This experiment is a signal of experiments, the release of the parent process semaphore as producers, as consumers apply for the child process semaphore. Redhat9.0 experimental environment
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