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PCB.cpp
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PCB.cpp
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#include "PCB.h"
#include <dos.h>
#include <iostream.h>//samo test
#include "Semaphor.h"
#include "Thread.h"
#include "Schedule.h"
int PCB::noMoreTime = 0;
int PCB::mustSwitchContext = 0;
unsigned temporaryRegister;
PCB* PCB::runningPCB = 0;
PCB* PCB::mainPCB = 0;
PCB* PCB::idlePCB = 0;
List* PCB::blockedPCB = new List();
List* PCB::terminatedPCB = new List();
List* PCB::allPCB = new List();
unsigned globalID=0;
static unsigned newsp, newss, oldsp, oldss;
static unsigned newip, newcs;
PCB::PCB(unsigned long stackSize,
unsigned int timeSlice,
Thread* myThread):
stackSize(stackSize),
timeToSleep(0),
timeToRun(timeSlice),
timeSlice(timeSlice),
myThread(myThread)
{
asm cli;
id=globalID;
switch(globalID)
{
case 0:mainPCB = this;break;
case 1:idlePCB = this;break;
}
globalID++;
allPCB->add(this);
state = NEW;
semaphore = new Semaphore(0);
stack = new unsigned[stackSize];
newsp=stackPointer=FP_OFF(stack+stackSize-1);
newss=stackSegment=FP_SEG(stack+stackSize-1);
newip=FP_OFF(&(wrapperRun));
newcs=FP_SEG(&(wrapperRun));
oldsp=_SP;
oldss=_SS;
_SP=newsp;
_SS=newss;
asm{
pushf
pop ax
or ax,0x200
push ax
mov ax,newcs
push ax
mov ax,newip
push ax
mov ax,0
push ax
push bx
push cx
push dx
push es
push ds
push si
push di
push bp
}
newsp=_SP;
newss=_SS;
_SP=oldsp;
_SS=oldss;
stackPointer=newsp;
stackSegment=newss;
asm sti;
}
PCB::~PCB()
{
allPCB->remove(id);
}
void PCB::start()
{
if(id==1)
state=TERMINATED;
else if(state==NEW)
{
state=READY;
Scheduler::put(this);
}
}
void PCB::waitToComplete()
{
if(runningPCB->state!=NEW&&
runningPCB->state!=TERMINATED)
semaphore->wait();
}
void PCB::sleep(unsigned int timeToSleep)
{
this->timeToSleep=timeToSleep;
state=BLOCKED;
if(blockedPCB->find(id)==0)
blockedPCB->add(this);
if(runningPCB==this)
dispatch();
}
void PCB::run()
{
myThread->run();
state=TERMINATED;
semaphore->signal();
dispatch();
}
void PCB::wrapperRun()
{
runningPCB->run();
}