Thread Priority
public class PriorityCompete extends Object {
private volatile int count;
private boolean yield;
private Thread internalThread;
private volatile boolean noStopRequested;
public PriorityCompete(String name, int priority, boolean yield) {
count = 0;
this.yield = yield;
noStopRequested = true;
Runnable r = new Runnable() {
public void run() {
try {
runWork();
} catch (Exception x) {
x.printStackTrace();
}
}
};
internalThread = new Thread(r, name);
internalThread.setPriority(priority);
}
private void runWork() {
Thread.yield();
while (noStopRequested) {
if (yield) {
Thread.yield();
}
count++;
for (int i = 0; i < 1000; i++) {
double x = i * Math.PI / Math.E;
}
}
}
public void startRequest() {
internalThread.start();
}
public void stopRequest() {
noStopRequested = false;
}
public int getCount() {
return count;
}
public String getNameAndPriority() {
return internalThread.getName() + ": priority="
+ internalThread.getPriority();
}
private static void runSet(boolean yield) {
PriorityCompete[] pc = new PriorityCompete[3];
pc[0] = new PriorityCompete("P0", 3, yield);
pc[1] = new PriorityCompete("P1", 6, yield);
pc[2] = new PriorityCompete("P2", 6, yield);
try {
Thread.sleep(1000);
} catch (InterruptedException x) {
}
for (int i = 0; i < pc.length; i++) {
pc[i].startRequest();
}
long startTime = System.currentTimeMillis();
try {
Thread.sleep(10000);
} catch (InterruptedException x) {
}
for (int i = 0; i < pc.length; i++) {
pc[i].stopRequest();
}
long stopTime = System.currentTimeMillis();
try {
Thread.sleep(1000);
} catch (InterruptedException x) {
}
int totalCount = 0;
for (int i = 0; i < pc.length; i++) {
totalCount += pc[i].getCount();
}
System.out.println("totalCount=" + totalCount + ", count/ms="
+ roundTo(((double) totalCount) / (stopTime - startTime), 3));
for (int i = 0; i < pc.length; i++) {
double perc = roundTo(100.0 * pc[i].getCount() / totalCount, 2);
System.out.println(pc[i].getNameAndPriority() + ", " + perc
+ "%, count=" + pc[i].getCount());
}
}
public static double roundTo(double val, int places) {
double factor = Math.pow(10, places);
return ((int) ((val * factor) + 0.5)) / factor;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
public void run() {
System.out.println("Run without using yield()");
System.out.println("=========================");
runSet(false);
System.out.println();
System.out.println("Run using yield()");
System.out.println("=================");
runSet(true);
}
};
Thread t = new Thread(r, "Priority");
t.setPriority(Thread.MAX_PRIORITY - 1);
t.start();
}
}
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