/*
 * KEvent.cpp
 *
 *  Created on: Jun 3, 2018
 *      Author: OS1
 */
#include "KEvent.h"
#include "PCB.h"
#include "Thread.h"
#include "SCHEDULE.h"
#include "IVTable.h"
#include "Def.h"
#include "IVTEntry.h"

KernelEvent::KernelEvent(IVTNo ivtNo){

    //lock

    myPCB = PCB::running;
    IVTable::myInterruptVectorTable->entries[(int) ivtNo]->setEvent(this);

    //unlock


}

KernelEvent::~KernelEvent(){

    IVTable::myInterruptVectorTable->entries[(int) ivtNo]->restoreOldRoutine();
    IVTable::myInterruptVectorTable->entries[(int) ivtNo] = NULL;

}


void KernelEvent::wait(){

    //lock

    if(myPCB == PCB::running && val-- == 0){
        block();
    }

    //unlock

}

void KernelEvent::signal(){

    //lock


    if(val<1 && val++<0){
        deblock();
    }

    //unlock
}

void KernelEvent::block() {

    //lock

        if(myPCB != NULL){
            myPCB->state = BLOCKED;
        }
        dispatch();

    //unlock
}

void KernelEvent::deblock() {

    //lock
        myPCB->state = READY;
        Scheduler::put(myPCB);
    //unlock
}