counting semaphore question

[Shiva Shankar]

Hi all,
Can you anyone tell me what is the exact use of counting semaphore in
kernel ?

When should we use it ? what is the practical usage of counting semaphores
in
Linux kernel ?

I have seen only mutex (Binary semaphore)is used  for synchronization not
the counting semaphore(count >1).

Any sugguestions would be appreciated

Thanks in advance.
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