interrupt.java

只是一个简单模拟操作系统

/*
 * Interrupt.java
 *
 * Created on 2006年3月16日, 下午8:02
 *
 *Used to be middle module between CPU and ProcessManager
 *That is , it is the only way that CPU and ProcessManager communicates
 * 
 */

package os.cpu;

/**
 *
 * @author Vernkin
 */

public class Interrupt {
    
    /**Intreeupt Num**/
    public final static int TIMEOUT_INTERRUPT = 10;
    public final static int HALT_INTERRUPT = 11;
    public final static int CPUFREE_INTERRUPT = 12;
    
    public final static int PrintOut_INTERRUPT = 21;
    public final static int ConsoleOut_INTERRUPT = 22;
    public final static int ConsoleIn_INTERRUPT = 23;
    
    private os.process.MyProcess p = null;
    private int interrupt_num;
    
    private boolean cpu;//true indicate CPU leave message
    private boolean manager;//true indicates ProcessManger leave message
    
    private static Interrupt it = new Interrupt();
    /** Creates a new instance of Interrupt */
    private Interrupt() {
        //empty body
    }
    
    public static Interrupt getInstance(){
        return it;
    }
    
    /**If can't work ,return false**/
    public boolean cpuSetMeaasge(os.process.MyProcess p,int interrupt_num){
        if(manager) 
            return false;
        this.p = p;
        this.interrupt_num = interrupt_num;
        System.out.println("CPU Request");
//        manager = false;
        cpu = true;
        
        return true;
    }
    
    public os.process.MyProcess cpuGetProcess(){
        if(!manager)
            return null;
        
        cpu = false;
        manager = false;
        System.out.println("CPU GetProcess "+p);
        os.process.MyProcess temp = p;
        p = null;
        return temp;      
    }
    
    public boolean managerShouldToSet(){
        return cpu && !manager;
        
    }
    
    public boolean managerSetMessage(os.process.MyProcess pp){
        /**cpu not request//manager hava already set**/
        if(!managerShouldToSet()){
            System.out.println("Stop managerSetMessage add new process");
            return false;
        }
            
        p = pp;
        System.out.println("manager Set Message "+p);
        manager = true;
        return true;
    }
    
    public os.process.MyProcess managerGetProcess(){
        if(!cpu)
            return null;
        manager = false;
        os.process.MyProcess temp = p;
        p = null;
        return temp;
    }
    
    public void managerNotAvailbleProcess(){
        interrupt_num = Interrupt.CPUFREE_INTERRUPT;
    }
    
    
    public boolean isCPURequest(){
        return cpu;
    }
    
    
    public int getInterruptNum(){
        return interrupt_num;
    }
    
    public void rest(int millsec){
        if(millsec<1000)
            millsec = 1000;
        try{
            Thread.sleep(millsec);          
        }catch(InterruptedException e){
            System.out.println(e.getMessage());
        }
    }
    
    
    public String getInterruptName(int interrupt){
        if(interrupt == Interrupt.TIMEOUT_INTERRUPT)
            return "Time Out Interrupt";
        if(interrupt == Interrupt.HALT_INTERRUPT)
            return "Halt Interrupt";
        if(interrupt == Interrupt.ConsoleIn_INTERRUPT)
            return "Console Input Interrupt";
        if(interrupt == Interrupt.ConsoleOut_INTERRUPT)
            return "Console Output Interrupt";
        if(interrupt == Interrupt.PrintOut_INTERRUPT)
            return "Printer Interrupt";
        
        return "Unknown Interrupt";
    }
}