@Uninterruptible
@NoNullCheck
public static boolean holdsLock(Object o, Offset lockOffset, RVMThread thread) {
for (int cnt = 0; ; ++cnt) {
int tid = thread.getLockingId();
Word bits = Magic.getWordAtOffset(o, lockOffset);
if (bits.and(TL_STAT_MASK).EQ(TL_STAT_BIASABLE)) {
// if locked, then it is locked with a thin lock
return bits.and(TL_THREAD_ID_MASK).toInt() == tid && !bits.and(TL_LOCK_COUNT_MASK).isZero();
} else if (bits.and(TL_STAT_MASK).EQ(TL_STAT_THIN)) {
return bits.and(TL_THREAD_ID_MASK).toInt() == tid;
} else {
if (VM.VerifyAssertions) VM._assert(bits.and(TL_STAT_MASK).EQ(TL_STAT_FAT));
// if locked, then it is locked with a fat lock
Lock l = Lock.getLock(getLockIndex(bits));
if (l != null) {
l.mutex.lock();
boolean result = (l.getOwnerId() == tid && l.getLockedObject() == o);
l.mutex.unlock();
return result;
}
}
RVMThread.yield();
}
}
