52POSIX MESSAGE QUEUES
This chapter describes POSIX message queues, which allow processes to exchange data in the form of messages. POSIX message queues are similar to their System V counterparts, in that data is exchanged in units of whole messages. However, there are also some notable differences:
• POSIX message queues are reference counted. A queue that is marked for deletion is removed only after it is closed by all processes that are currently using it.
• Each System V message has an integer type, and messages can be selected in a variety of ways using msgrcv(). By contrast, POSIX messages have an associated priority, and messages are always strictly queued (and thus received) in priority order.
• POSIX message queues provide a feature ...
Get The Linux Programming Interface now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
