@Stage("Locks")
public void readUnlockAndDecrementCount() {
switch (localLockState) {
case UNLOCKED:
return;
case READ_LOCKED:
if (decrementRead() == 0) {
if (updateZero() && writeZero()) segmentHeader.readUnlock(segmentHeaderAddress);
}
return;
case UPDATE_LOCKED:
if (decrementUpdate() == 0) {
if (writeZero()) {
if (readZero()) {
segmentHeader.updateUnlock(segmentHeaderAddress);
} else {
segmentHeader.downgradeUpdateToReadLock(segmentHeaderAddress);
}
}
}
return;
case WRITE_LOCKED:
if (decrementWrite() == 0) {
if (!updateZero()) {
segmentHeader.downgradeWriteToUpdateLock(segmentHeaderAddress);
} else {
if (!readZero()) {
segmentHeader.downgradeWriteToReadLock(segmentHeaderAddress);
} else {
segmentHeader.writeUnlock(segmentHeaderAddress);
}
}
}
}
}
@Stage("Locks")
private void closeRootLocks() {
verifyInnermostContext();
switch (localLockState) {
case UNLOCKED:
return;
case READ_LOCKED:
segmentHeader.readUnlock(segmentHeaderAddress);
return;
case UPDATE_LOCKED:
segmentHeader.updateUnlock(segmentHeaderAddress);
return;
case WRITE_LOCKED:
segmentHeader.writeUnlock(segmentHeaderAddress);
}
}