该工作活动将扩展1003.1（经1003.1b、1003.1c和1003.1i修订）定义的系统接口，以包括实时应用程序所需的以下附加设施:高效的进程创建机制、附加的实时调度策略、执行时间监控接口、与特殊设备交互的接口，用于提高I/O性能的接口，以及用于阻塞功能的超时。本标准不会改变其修订的基础标准（包括任何现有修订），从而导致实施或严格符合要求的应用不再符合。

This work activity will extend the system interfaces defined by 1003.1 (as amended by 1003.1b, 1003.1c, and 1003.1i) to include the following additional facilities required by realtime applications: an efficient process creation mechanism, additional realtime scheduling policies, interfaces for execution time monitoring, interfaces for interacting with special devices, interfaces for improving I/O performance, and timeouts for blocking functions. This standard will not change the base standard which it amends (including any existing amendments) in such a way as to cause implementations or strictly conforming applications to no longer conform.