/** Spin-waits until sync.isQueued(t) becomes true. */
void waitForQueuedThread(AbstractQueuedLongSynchronizer sync, Thread t) {
long startTime = System.nanoTime();
while (!sync.isQueued(t)) {
if (millisElapsedSince(startTime) > LONG_DELAY_MS)
throw new AssertionFailedError("timed out");
Thread.yield();
}
assertTrue(t.isAlive());
}
/**
* Delays, via Thread.sleep, for the given millisecond delay, but if the sleep is shorter than
* specified, may re-sleep or yield until time elapses.
*/
static void delay(long millis) throws InterruptedException {
long startTime = System.nanoTime();
long ns = millis * 1000 * 1000;
for (; ; ) {
if (millis > 0L) Thread.sleep(millis);
else // too short to sleep
Thread.yield();
long d = ns - (System.nanoTime() - startTime);
if (d > 0L) millis = d / (1000 * 1000);
else break;
}
}
/**
* Spin-waits up to the specified number of milliseconds for the given thread to enter a wait
* state: BLOCKED, WAITING, or TIMED_WAITING.
*/
void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
long startTime = System.nanoTime();
for (; ; ) {
Thread.State s = thread.getState();
if (s == Thread.State.BLOCKED || s == Thread.State.WAITING || s == Thread.State.TIMED_WAITING)
return;
else if (s == Thread.State.TERMINATED) fail("Unexpected thread termination");
else if (millisElapsedSince(startTime) > timeoutMillis) {
threadAssertTrue(thread.isAlive());
return;
}
Thread.yield();
}
}