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CPUScheduler.java
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import java.util.concurrent.TimeUnit;
public class CPUScheduler implements Runnable {
@Override
public void run() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
while (true) {
/* Needs to be mutuzed around since unsynced */
if (Assign5.readyQ.isEmpty() && !Assign5.cpuBusy && Assign5.ioQ.isEmpty() && !Assign5.ioBusy && Assign5.fileReadDone) {
break;
}
if ("FIFO".equals(Assign5.schedulingAlg)) {
try {
boolean response = Assign5.semCpu.tryAcquire(1, TimeUnit.SECONDS);
if (!response) {
break;
}
Assign5.cpuBusy = true;
boolean proceed = true;
synchronized(Assign5.readyQ) { /* Also synchronized(obj){ } structure is OK to use for protecting critical sections in your methods).*/
if (Assign5.readyQ.isEmpty()) proceed = false;
}
if (proceed) {
Node n = Assign5.readyQ.removeFirstWrapper();
long processStart = System.currentTimeMillis();
n.setTimeInRQ(System.currentTimeMillis() - n.getTimeEnteredRQ());
int sleepTime = n.getCpuBurst()[n.getCpuIndex()];
Thread.sleep(sleepTime);
n.setWaitingTime(n.getWaitingTime() + Assign5.readyClock);
Assign5.totalReadyWaitingTime = Assign5.totalReadyWaitingTime + n.getWaitingTime();
Assign5.readyClock = Assign5.readyClock + sleepTime;
Assign5.readyTATime = Assign5.readyTATime + Assign5.readyClock;
Assign5.numRQJobs++;
n.setTimeEnteredRQ(0);
n.setCpuIndex(n.getCpuIndex() + 1);
Assign5.readyProcessTime.add(System.currentTimeMillis() - processStart);
if (n.getCpuIndex() >= n.getNumCPUBurst()) {
n.setTurnAroundTime(System.currentTimeMillis() - n.getTimeCreated());
Assign5.terminated.add(n);
} else {
Assign5.ioQ.addWrapper(n);
}
}
Assign5.cpuBusy = false;
Assign5.semIo.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
} else if ("SJF".equals(Assign5.schedulingAlg)) {
try {
boolean response = Assign5.semCpu.tryAcquire(1, TimeUnit.SECONDS);
if (!response) {
break;
}
Assign5.cpuBusy = true;
boolean proceed = true;
synchronized(Assign5.readyQ) { /* Also synchronized(obj){ } structure is OK to use for protecting critical sections in your methods).*/
if (Assign5.readyQ.isEmpty()) proceed = false;
}
if (proceed) {
Node n = Assign5.readyQ.removeMinCPUBurstWrapper();
long processStart = System.currentTimeMillis();
n.setTimeInRQ(System.currentTimeMillis() - n.getTimeEnteredRQ());
int sleepTime = n.getCpuBurst()[n.getCpuIndex()];
Thread.sleep(sleepTime);
n.setWaitingTime(n.getWaitingTime() + Assign5.readyClock);
Assign5.totalReadyWaitingTime = Assign5.totalReadyWaitingTime + n.getWaitingTime();
Assign5.readyClock = Assign5.readyClock + sleepTime;
Assign5.readyTATime = Assign5.readyTATime + Assign5.readyClock;
Assign5.numRQJobs++;
n.setTimeEnteredRQ(0);
n.setCpuIndex(n.getCpuIndex() + 1);
Assign5.readyProcessTime.add(System.currentTimeMillis() - processStart);
if (n.getCpuIndex() >= n.getNumCPUBurst()) {
n.setTurnAroundTime(System.currentTimeMillis() - n.getTimeCreated());
Assign5.terminated.add(n);
} else {
Assign5.ioQ.addWrapper(n);
}
}
Assign5.cpuBusy = false;
Assign5.semIo.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
} else if ("PR".equals(Assign5.schedulingAlg)) {
try {
boolean response = Assign5.semCpu.tryAcquire(1, TimeUnit.SECONDS);
if (!response) {
break;
}
Assign5.cpuBusy = true;
boolean proceed = true;
synchronized(Assign5.readyQ) { /* Also synchronized(obj){ } structure is OK to use for protecting critical sections in your methods).*/
if (Assign5.readyQ.isEmpty()) proceed = false;
}
if (proceed) {
Node n = Assign5.readyQ.removeHighestPRWrapper();
long processStart = System.currentTimeMillis();
n.setTimeInRQ(System.currentTimeMillis() - n.getTimeEnteredRQ());
int sleepTime = n.getCpuBurst()[n.getCpuIndex()];
Thread.sleep(sleepTime);
n.setWaitingTime(n.getWaitingTime() + Assign5.readyClock);
Assign5.totalReadyWaitingTime = Assign5.totalReadyWaitingTime + n.getWaitingTime();
Assign5.readyClock = Assign5.readyClock + sleepTime;
Assign5.readyTATime = Assign5.readyTATime + Assign5.readyClock;
Assign5.numRQJobs++;
n.setTimeEnteredRQ(0);
n.setCpuIndex(n.getCpuIndex() + 1);
Assign5.readyProcessTime.add(System.currentTimeMillis() - processStart);
if (n.getCpuIndex() >= n.getNumCPUBurst()) {
n.setTurnAroundTime(System.currentTimeMillis() - n.getTimeCreated());
Assign5.terminated.add(n);
} else {
Assign5.ioQ.addWrapper(n);
}
}
Assign5.cpuBusy = false;
Assign5.semIo.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
} else if ("RR".equals(Assign5.schedulingAlg)) {
try {
boolean response = Assign5.semCpu.tryAcquire(1, TimeUnit.SECONDS);
if (!response) {
break;
}
Assign5.cpuBusy = true;
boolean proceed = true;
synchronized(Assign5.readyQ) { /* Also synchronized(obj){ } structure is OK to use for protecting critical sections in your methods).*/
if (Assign5.readyQ.isEmpty()) proceed = false;
}
if (proceed) {
Node n = Assign5.readyQ.removeFirstWrapper();
long processStart = System.currentTimeMillis();
n.setTimeInRQ(System.currentTimeMillis() - n.getTimeEnteredRQ());
if (Assign5.quantum < n.getCpuBurst()[n.getCpuIndex()]) {
int[] temp = n.getCpuBurst();
temp[n.getCpuIndex()] = temp[n.getCpuIndex()] - Assign5.quantum;
n.setCpuBurst(temp);
}
int sleepTime = n.getCpuBurst()[n.getCpuIndex()];
Thread.sleep(sleepTime);
n.setWaitingTime(n.getWaitingTime() + Assign5.readyClock);
Assign5.totalReadyWaitingTime = Assign5.totalReadyWaitingTime + n.getWaitingTime();
Assign5.readyClock = Assign5.readyClock + sleepTime;
Assign5.readyTATime = Assign5.readyTATime + Assign5.readyClock;
Assign5.numRQJobs++;
n.setTimeEnteredRQ(0);
n.setCpuIndex(n.getCpuIndex() + 1);
Assign5.readyProcessTime.add(System.currentTimeMillis() - processStart);
if (n.getCpuIndex() >= n.getNumCPUBurst()) {
n.setTurnAroundTime(System.currentTimeMillis() - n.getTimeCreated());
Assign5.terminated.add(n);
} else {
Assign5.ioQ.addWrapper(n);
}
}
Assign5.cpuBusy = false;
Assign5.semIo.release();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
Assign5.cpuDone = true;
}
}