Sharing Mutex and Condition Variable Between Processes

As title, the key is to set an attribute(PTHREAD_PROCESS_SHARED) to the mutex/condition variable using pthread_mutexattr_setpshared() or pthread_condattr_setpshared(). Without these function calls, the parent in the following code will not get signaled forever.

Shared memory is used to share the mutex and condition variable.

NOTE: The process-shared mutex attribute isn’t universally supported yet. You should confirm before using them.

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