TIP:
- What are the differences between
System V IPCandPOSIX IPC? - Why do we have two standards ?
- How to decide which IPC functions to use ?
ANS:
Both have the same basic tools -- semaphores, shared memory and message queues. They offer a slightly different interface to those tools, but the basic concepts are the same. One notable difference is that POSIX offers some notification features for message queues that Sys V does not. (See mq_notify().)
Sys V IPC has been around for longer which has a couple of practical implications --
First, POSIX IPC is less widely implemented. I wrote a Python wrapper for POSIX IPC and its documentation lists what I know about POSIX IPC implementations on various platforms.

本文探讨了System V IPC和POSIX IPC的区别,包括接口差异、实现广泛性及设计优劣。尽管POSIX API更现代、简单,但System V IPC因历史原因在某些平台上更全面。在选择使用哪种IPC时,需要根据具体应用需求来决定。
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