úÎ!ÚbNone'FXïqsem— is a quantity semaphore in which the resource is acquired and released in units of one. It provides guaranteed FIFO ordering for satisfying blocked  calls. The pattern $ bracket_ waitQSem signalQSem (...)/is safe; it never loses a unit of the resource.qsem Build a new O with a supplied initial quantity. The initial quantity must be at least 0.qsem$Wait for a unit to become available.qsemSignal that a unit of the  is availableNone'FX>qsem› is a quantity semaphore in which the resource is acquired and released in units of one. It provides guaranteed FIFO ordering for satisfying blocked  calls. The pattern . bracket_ (waitQSemN n) (signalQSemN n) (...),is safe; it never loses any of the resource.qsem Build a new N with a supplied initial quantity. The initial quantity must be at least 0.qsem4Wait for the specified quantity to become available.qsem7Signal that a given quantity is now available from the . #qsem-0.1.0.0-Dwto2F6gf7B2rb1ejDiDweQSemQSemNnewQSemwaitQSem signalQSemnewQSemN waitQSemN signalQSemN