/*
* see bug 121737
* To ensure that we do not enter a deadly embrace between classloader cycles
* we attempt to obtain a global lock before do normal osgi delegation.
* This approach ensures that only one thread has a classloader locked at a time
*/
private static void lock(Object loader) {
Thread currentThread = Thread.currentThread();
boolean interrupted = false;
synchronized (loader) {
if (tryLock(currentThread, loader)) return; // this thread has the lock
do {
try {
// we wait on the loader object here to release its lock incase we have it.
// we do not way to wait while holding this lock because that will cause deadlock
loader.wait();
} catch (InterruptedException e) {
interrupted = true;
// we still want to try again
}
} while (!tryLock(currentThread));
}
if (interrupted) currentThread.interrupt();
}
