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The HP-UX operating system uses shared memory to provide three
mechanisms for communicating between cooperating programs and processes: - Messages
Message data is stored in a given part of shared
memory to be retrieved by receiving programs. For more information
about how shared memory space for messages is allocated and managed,
see “Overview of Message
Queue Operations”. - Semaphores
Shared storage locations that contain up/down counters
for signaling the current status of cooperating processes. For more
information about how shared memory space for semaphores is allocated
and managed, see “Overview of Semaphore
Operations”. - Shared Memory
Reserved data storage area shared by two or more
processes by means of identically-defined data structures in each
cooperating process. For more information about how shared memory
space for shared data structures is allocated and managed, see “Overview of Shared
Memory Operation”.
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