-- MOSSIMFIFOImpl.sak
-- last edited by Suzuki: 20-Nov-81 16:02:15

DIRECTORY
  Connector,
  FIFO,
  MOSSIMFunc,
  Process,
  Scheduler;
  
MOSSIMFIFOImpl: MONITOR IMPORTS Connector, MOSSIMFunc, Process, Scheduler
  EXPORTS FIFO ={
    
FIFOFunc: PUBLIC DEVICE [size: CARDINAL] = {
    IN Init, WriteRequest, ReadRequest: BOOLEAN,
        DIn: CARDINAL
    OUT SpaceAv, DataAv: BOOLEAN, DOut: CARDINAL
    GUARDIAN {
        Initialized: BOOLEAN _ FALSE;
        DO CHOICE {
          WHEN Init UP -> {IF ReadRequest OR WriteRequest THEN ERROR;
           Initialized _ TRUE} ||
          WHEN ReadRequest UP -> IF ~Initialized OR Init OR ~DataAv
           THEN ERROR ||
          WHEN WriteRequest UP -> IF ~Initialized OR Init OR ~SpaceAv
           THEN ERROR}
        ENDLOOP }
    MOSSIM fifo.sim
    };
     
NULL

}. -- end of FIFO DEFINITION