System V message queues allow data to be exchanged in units called messages.
Each messages can have an associated priority, POSIX message queues provide an
alternative API for achieving the same result; see mq_overview(7).
The System V message queue API consists of the following system
System V semaphores allow processes to synchronize their actions System V
semaphores are allocated in groups called sets; each semaphore in a set is a
counting semaphore. POSIX semaphores provide an alternative API for achieving
the same result; see sem_overview(7).
The System V semaphore API consists of the following system
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