Gets the current unit count of a semaphore.
mp
semaphore-count sem => count
sem
A semaphore.
count
A non negative fixnum.
The function semaphore-count returns the current unit count of the semaphore sem . The value is 0 if the semaphore has no unit remaining.
The current unit count value can change in the semaphore after calling semaphore-count .
semaphore-count
make-semaphore semaphore-acquire semaphore-release semaphore-wait-count
