@Override
public Double doInBackground() {
LOG.debug("Building threads");
for (int i = 0; i < threadCount; i++) {
threads.add(new PerformanceThread());
}
time = time * 1000;
double stepsPerSecondAll = 0;
double pi = 0;
long start = System.currentTimeMillis();
long stepsOverall = 0;
Timer timer = new Timer();
timer.schedule(new PerformanceTimerTask(start), 0, intervall);
LOG.debug("starting threads");
for (PerformanceThread p : threads) {
p.start();
}
while ((System.currentTimeMillis() - start < time) && !isCancelled()) {
try {
Thread.sleep(intervall / 10);
} catch (InterruptedException ex) {
LOG.debug("", ex);
}
}
timer.cancel();
setProgress(100);
LOG.debug("Interrupting threads");
for (PerformanceThread p : threads) {
p.interrupt();
stepsOverall += p.getSteps();
pi += p.getPi();
}
pi = pi / threadCount;
stepsPerSecondAll = stepsOverall / (System.currentTimeMillis() - start);
publish(pi + " ( " + stepsPerSecondAll + " steps per millisecond )");
return pi;
}
void start() {
if (started.compareAndSet(false, true)) {
thread.start();
}
}