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52. POSIX Message Queues > Comparison of POSIX and System V Message Queues

Comparison of POSIX and System V Message Queues

Comparison of System V IPC and POSIX IPC listed various advantages of the POSIX IPC interface over the System V IPC interface: the POSIX IPC interface is simpler and more consistent with the traditional UNIX file model, and POSIX IPC objects are reference counted, which simplifies the task of determining when to delete an object. These general advantages also apply to POSIX message queues.

POSIX message queues also have the following specific advantages over System V message queues:

  • The message notification feature allows a (single) process to be asynchronously notified via a signal or the instantiation of a thread when a message arrives on a previously empty queue.


  

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