//------------------------------------------------------------------------
// Filename:
//     alarmclock-mon.cpp
// PROGRAM DESCRIPTION
//     Class implementation file for the Alarm Monitor class
//------------------------------------------------------------------------

#include <iostream.h>
#include "ThreadClass.h"
#include "alarmclock-mon.h"

//------------------------------------------------------------------------
// Alarm::Alarm()
//      Constructor
//------------------------------------------------------------------------

AlarmMonitor::AlarmMonitor(char* Name)
             : Monitor(Name, HOARE), Wake("Wake")
{
     Now = 0;            // reset the clock
}

//------------------------------------------------------------------------
// Alarm::Slumber(int  n)
//      Monitor procedure Slumber
//------------------------------------------------------------------------

void AlarmMonitor::Slumber(int  n)
{   
     int  AlarmCall;

     MonitorBegin(); 
     AlarmCall = Now + n;          // wake up after n calls
     while (Now < AlarmCall) {     // not time to wake up
          Wake.Wait();             // goes back to sleep
          Wake.Signal();           // wake up another sleeper
     }                             // so that he could check time
     MonitorEnd();                 
}

//------------------------------------------------------------------------
// Alarm::ClockTick()
//      Monitor procedure ClockTick()
//------------------------------------------------------------------------

void AlarmMonitor::ClockTick()
{
     MonitorBegin();          
     Now++;                   // advance timer
     Wake.Signal();           // cascading wake-up
     MonitorEnd();            
}

// end of alarmclock-mon.cpp