void thrdRequest(LPVOID lpvThreadParam) {
long i;
bool waiting = true;
CString outbuffer;
char tempclock[100];
while (!exitFlag) {
Sleep(4000);
LogEvent("Current Process Requesting Access to Critical Section");
WaitForSingleObject(sRequest, INFINITE);
WaitForSingleObject(sReply, INFINITE);
WaitForSingleObject(sClock, INFINITE);
insertRequest(gProcessID, myclock);
for (i=1; i<= NUMBEROFPROCESSES; i++) {
if (i != gProcessID) {
ReplyQueue[i-1] = false;
outbuffer = "REQUEST:";
outbuffer += ltoa(gProcessID,tempclock, 10);
outbuffer += ":";
outbuffer += ltoa(myclock, tempclock, 10);
sendMessage(outbuffer, i);
}
}
waitingForReply = true;
myclock++;
ReleaseSemaphore(sClock, 1, &i);
ReleaseSemaphore(sReply, 1, &i);
ReleaseSemaphore(sRequest, 1, &i);
while (waiting) {
waiting = false;
WaitForSingleObject(sReply, INFINITE);
WaitForSingleObject(sAlive, INFINITE);
for (i=0; i<NUMBEROFPROCESSES; i++) {
if ((i+1) != gProcessID) {
if (AliveQueue[i]) {
if (ReplyQueue[i] == false) waiting = true;
}
}
}
ReleaseSemaphore(sAlive, 1, &i);
ReleaseSemaphore(sReply, 1, &i);
}
waiting = true;
WaitForSingleObject(sClock, INFINITE);
criticalsection();
ReleaseSemaphore(sClock, 1, &i);
WaitForSingleObject(sRequest, INFINITE);
RequestQueue[gProcessID -1] = -1;
ReleaseSemaphore(sRequest, 1, &i);
}
ExitThread(0);
}//end of Request thread
//FUNCTION TO DEMONSTRATE MUTEX USE
void runmutex()
{
rq *temp=NULL;
int np,i;
printf("\n Enter number of processes in ready queue\n");
scanf("%d",&np);
while(np--)
headofrq=createrq(&headofrq);
temp=removeprocess(&headofrq);
while(temp)
{
if(mutex)
{
criticalsection(temp);
temp=removeprocess(&headofrq);
}
}
printf("\n\n All Processes have finished their critical sections successfully\n\n");
}
