public synchronized boolean recheck(WaitQueue.WaitNode node) {
Thread caller = Thread.currentThread();
if (owner_ == null) {
owner_ = caller;
holds_ = 1;
return true;
} else if (caller == owner_) {
incHolds();
return true;
}
wq_.insert(node);
return false;
}
protected synchronized WaitQueue.WaitNode getSignallee(Thread caller) {
if (caller != owner_) throw new IllegalMonitorStateException("Not owner");
// assert (holds_ > 0)
if (holds_ >= 2) { // current thread will keep the lock
--holds_;
return null;
}
// assert (holds_ == 1)
WaitQueue.WaitNode w = wq_.extract();
if (w == null) { // if none, clear for new arrivals
owner_ = null;
holds_ = 0;
}
return w;
}
public synchronized boolean isQueued(Thread thread) {
return wq_.isWaiting(thread);
}
public synchronized Collection getQueuedThreads() {
return wq_.getWaitingThreads();
}
public synchronized int getQueueLength() {
return wq_.getLength();
}
public synchronized boolean hasQueuedThreads() {
return wq_.hasNodes();
}