|Simple quantity semaphores.
|Simple Quantity Semaphores
|A QSem is a simple quantity semaphore, in which the available
"quantity" is always dealt with in units of one.
|Build a new QSem with a supplied initial quantity.
The initial quantity must be at least 0.
|Wait for a unit to become available
|Signal that a unit of the QSem is available
|Produced by Haddock version 2.6.0|