RTEMS 4.5.1-pre3 On-Line Library

Semaphore Manager Using as a Binary Semaphore

RTEMS POSIX API User's Guide

9.3.1: Using as a Binary Semaphore

Although POSIX supports mutexes, they are only visible between threads. To work between processes, a binary semaphore must be used.

Creating a semaphore with a limit on the count of 1 effectively restricts the semaphore to being a binary semaphore. When the binary semaphore is available, the count is 1. When the binary semaphore is unavailable, the count is 0.

Since this does not result in a true binary semaphore, advanced binary features like the Priority Inheritance and Priority Ceiling Protocols are not available.

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RTEMS POSIX API User's Guide