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Performance of Binary semaphores vs counting semaphores

Chris Meng
Mastermind 35175 points

Hi,

In TI SYS/BIOS Real-time Operating System v6.x User’s Guide, I found below statemnt.

Binary semaphores provide better performance than counting semaphores.

Do you have some detial data about the performance difference with Binary semaphores vs counting semaphores?

  • 0
    TI__Guru* 96960 points

    The difference is very minor. On the Semaphore_post the following are the differences:

    binary: set the internal count to 1

    counting: increment the count. If instrumentation is enabled, assert check that the count did not wrap.

    So if you are using non-instrumented code, the difference is really just

    sem->count = 1;

    versus

    sem->count++;

    Hope that helps.

    Todd