dispatch_ semaphore_ Grand central dispatch of create – lvalue parameter?

In dispatch_ semaphore_ In create, what does the long value parameter mean?

dispatch_semaphore_create(long value)

I don't see this in the documentation, only examples of its use with zero parameters

Solution

The value parameter is the initial value of the count semaphore

dispatch_ semaphore_ Wait() decrements the semaphore count and waits for the result value to be less than 0 (that is, you can call dispatch_semaphore_wait four times without waiting for a semaphore created with a value of 4)

dispatch_ semaphore_ Signal() increments the semaphore count and wakes up the attendant when the result value is less than or equal to 0

For typical usage examples (managing a limited resource pool), see dispatch_ semaphore_ Create (3) online help page