add: ReleaseSemaphore(&iounit->Lock);
context: StopCmd ( struct AHIRequest *ioreq,           struct AHIBase *AHIBase ){  struct AHIDevUnit *iounit;  iounit = (struct AHIDevUnit *) ioreq->ahir_Std.io_Unit;  iounit->StopCnt++;  TermIO(ioreq,AHIBase);}