Semaphores: sem_getvalue not implemented: why? when? workaround?

It seems sem_getvalue is not implemented on Darwin.
Does anyone know why?
Does anyone know if/when it will be implemented?
Does anyone a workaround? (i.e. any way to get the current value of a named semaphore?)
I need to share a value between two or more processes and I need to be able to atomically increase it. Using MACH semaphores does not help (no getvalue there either). One option I could see would be to use shared memory, but then I'd also have to use a named semaphore to atomically increase the value in there, but this all is starting to get quite convoluted for what is a basic functionality of named semaphores. So I'm open to any suggestion, surely someone else must have run into this problem before (like in porting Unix code to Darwin for example).

semctl is for System V semaphores, you can't use it with a pthread semaphore. I would have to re-write everything using System V semaphores rather than named pthread semaphores, which is what I am trying to avoid in the first place.
I actually find it a bit strange that System V and pthread semaphore calls are making "see also" reference to each other in the man pages while they are obviously completely different implementations (of the same semaphore concept)...

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hi
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Semaphores: sem_getvalue not implemented: why? when? workaround?

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