/** compareAndSet succeeds in changing value if equal to expected else fails */
public void testCompareAndSet() {
AtomicLong ai = new AtomicLong(1);
assertTrue(ai.compareAndSet(1, 2));
assertTrue(ai.compareAndSet(2, -4));
assertEquals(-4, ai.get());
assertFalse(ai.compareAndSet(-5, 7));
assertFalse((7 == ai.get()));
assertTrue(ai.compareAndSet(-4, 7));
assertEquals(7, ai.get());
}
/**
* @param pid PID of the other party.
* @param size Size of the space.
* @return Token pair.
*/
private IgnitePair<String> inOutToken(int pid, int size) {
while (true) {
long idx = tokIdxGen.get();
if (tokIdxGen.compareAndSet(idx, idx + 2))
return F.pair(
new File(tokDir, TOKEN_FILE_NAME + idx + "-" + pid + "-" + size).getAbsolutePath(),
new File(tokDir, TOKEN_FILE_NAME + (idx + 1) + "-" + pid + "-" + size)
.getAbsolutePath());
}
}
/** compareAndSet in one thread enables another waiting for value to succeed */
public void testCompareAndSetInMultipleThreads() {
final AtomicLong ai = new AtomicLong(1);
Thread t =
new Thread(
new Runnable() {
public void run() {
while (!ai.compareAndSet(2, 3)) Thread.yield();
}
});
try {
t.start();
assertTrue(ai.compareAndSet(1, 2));
t.join(LONG_DELAY_MS);
assertFalse(t.isAlive());
assertEquals(ai.get(), 3);
} catch (Exception e) {
unexpectedException();
}
}
@Override
public String getLID(DSLAMSource source)
throws IOException, TimeoutADManClientException, ADManClientException {
// Update counters:
String res = null;
{
invokeSyncBeginCount.incrementAndGet();
long runningCount = invokeSyncRunningCount.incrementAndGet();
long runningCountMax = invokeSyncRunningCountMax.get();
if (runningCount > runningCountMax) {
invokeSyncRunningCountMax.compareAndSet(runningCountMax, runningCount);
}
synchronized (invokeBeginFrequencyCounter) {
invokeBeginFrequencyCounter.increment();
}
}
try {
res = super.getLID(source);
} catch (Throwable ex) {
invokeSyncEndFailureCount.incrementAndGet();
} finally {
// Update counters:
{
invokeSyncEndCount.incrementAndGet();
invokeSyncRunningCount.decrementAndGet();
synchronized (invokeEndFrequencyCounter) {
invokeEndFrequencyCounter.increment();
}
}
}
return res;
}
