Implementation details of semaphore objects in RTOS

Dear Experts,
I am interested in knowing how do RTOS implement semaphore
objects?It would be helpful if some one could let me know some links
or some of your thoughts from your own experience.
This is part of my own learning to update myself on what goes beneath
when you take a semaphore or give a semaphore in a RTOS.

Looking farward for your thoughts and advanced thanks for the same,

Regards,
s.subbarayan


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