Книга: Programming with POSIX® Threads

5.5.1 POSIX realtime options

5.5.1 POSIX realtime options

The POSIX standards are flexible, because they're designed to be useful in a wide range of environments. In particular, since traditional UNIX systems don't support any form of realtime scheduling control, all of the tools for controlling realtime response are optional. The fact that a given implementation of UNIX "conforms to 1003.1c-1995" does not mean you can write predictable realtime programs.

If the system defines _POSIX_THREAD_PRIORITY_SCHEDULING, it provides support for assigning realtime scheduling priorities to threads. The POSIX priority scheduling model is a little more complicated than the traditional UNIX priority model, but the principle is similar. Priority scheduling allows the programmer to give the system an idea of how important any two threads are, relative to each other. Whenever more than one thread is ready to execute, the system will choose the thread with the highest priority.

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