POSIX.4
The POSIX.4 standard, an addition to and modification of the POSIX.1 standard, describes C language interfaces for real-time applications. The standard defines real time as “the ability of the operating system to provide a required level of service in a bounded response time.” Real-time systems have historically been implemented as stand-alone systems controlling processes or machines or as embedded systems (such as inside a microwave oven). However, there has always been a need for combined interactive and real-time systems, and the UNIX system has served as the base for many implementations of real-time facilities.
The facilities specified in POSIX.4 are those commonly used by real-time applications, such as semaphores, timers, interprocess ...
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