public void run() {
producer.getReady();
MyBlockingQueue<Integer> buffer = producer.getBuffer();
Integer item = buffer.take();
while (item != null) {
System.out.println(this + " fetches " + item + ".");
Thread.yield();
item = buffer.take();
}
}
public static void main(String[] args) {
final AttemptLocking al = new AttemptLocking();
al.untimed(); // True -- lock is available
al.timed(); // True -- lock is available
// Now create a separate task to grab the lock:
new Thread() {
{
setDaemon(true);
}
public void run() {
al.lock.lock();
System.out.println("acquired");
}
}.start();
Thread.yield(); // Give the 2nd task a chance
al.untimed(); // False -- lock grabbed by task
al.timed(); // False -- lock grabbed by task
}
/**
* Look for data from all the inputs
*
* @return true if data was consumed
*/
private boolean poll(Signal signal, Signal parent) {
AtomicReferenceArray<T> o = outputs;
for (int i = 0; i < o.length(); i++) {
T input = o.getAndSet(i, null);
if (input == null) continue;
long seq = ++sequence;
if (parent != null) parent.signal();
S product = producer.execute(input, reuseReceptors.get(i), signal);
signal.signal();
if (!consume(product, seq, 0)) {
Thread.yield();
if (!consume(product, seq, 0))
logger.info(
"failed to consume product (" + product + ") from producer (" + producer + ")");
}
producer.complete(product);
return product != null;
}
return false;
}
@Override
public void run() {
try {
while (started) {
int result = execute();
if (result < 0) break;
if (result > 0) {
if (sleep > 0) {
Thread.sleep(sleep);
sleptTime += sleep;
} else if (sleep < 0) Thread.yield();
} else if (adding) {
Thread.sleep(1);
} else {
if (sleep > 0) {
incrementTime++;
if (incrementTime % 1_000_000 == 0) {
toSleepTime += sleep;
if (sleptTime < toSleepTime) {
sleptTime += sleep;
Thread.sleep(sleep);
}
}
}
}
}
} catch (InterruptedException e) {
if (started) {
if (listener == null) logger.warn("polling", e);
else listener.exceptionThrown(e);
}
} catch (Exception e) {
if (listener == null) logger.error("polling", e);
else listener.exceptionThrown(e);
}
}