/** * @param lock Lock address. */ public void readUnlock(long lock) { while (true) { long state = GridUnsafe.getLongVolatile(null, lock); if (lockCount(state) <= 0) throw new IllegalMonitorStateException("Attempted to release a read lock while not holding it " + "[lock=" + U.hexLong(lock) + ", state=" + U.hexLong(state) + ']'); long updated = updateState(state, -1, 0, 0); assert updated != 0; if (GridUnsafe.compareAndSwapLong(null, lock, state, updated)) { // Notify monitor if we were CASed to zero and there is a write waiter. if (lockCount(updated) == 0 && writersWaitCount(updated) > 0) { int idx = lockIndex(lock); ReentrantLock lockObj = locks[idx]; lockObj.lock(); try { // Note that we signal all waiters for this stripe. Since not all waiters in this // stripe/index belong to this particular lock, we can't wake up just one of them. writeConditions[idx].signalAll(); } finally { lockObj.unlock(); } } return; } } }
/** * @param lock Lock address. */ public boolean writeLock(long lock, int tag) { assert tag != 0; for (int i = 0; i < SPIN_CNT; i++) { long state = GridUnsafe.getLongVolatile(null, lock); assert state != 0; if (!checkTag(state, tag)) return false; if (canWriteLock(state)) { if (GridUnsafe.compareAndSwapLong(null, lock, state, updateState(state, -1, 0, 0))) return true; else // Retry CAS, do not count as spin cycle. i--; } } int idx = lockIndex(lock); ReentrantLock lockObj = locks[idx]; lockObj.lock(); try { updateWritersWaitCount(lock, lockObj, 1); return waitAcquireWriteLock(lock, idx, tag); } finally { lockObj.unlock(); } }
/** * @param lock Lock address. */ public void writeUnlock(long lock, int tag) { long updated; assert tag != 0; while (true) { long state = GridUnsafe.getLongVolatile(null, lock); if (lockCount(state) != -1) throw new IllegalMonitorStateException("Attempted to release write lock while not holding it " + "[lock=" + U.hexLong(lock) + ", state=" + U.hexLong(state) + ']'); updated = releaseWithTag(state, tag); assert updated != 0; if (GridUnsafe.compareAndSwapLong(null, lock, state, updated)) break; } int writeWaitCnt = writersWaitCount(updated); int readWaitCnt = readersWaitCount(updated); if (writeWaitCnt > 0 || readWaitCnt > 0) { int idx = lockIndex(lock); ReentrantLock lockObj = locks[idx]; lockObj.lock(); try { signalNextWaiter(writeWaitCnt, readWaitCnt, idx); } finally { lockObj.unlock(); } } }
int idx = lockIndex(lock);
int idx = lockIndex(lock);
/** * @param lock Lock address. */ public void readUnlock(long lock) { while (true) { long state = GridUnsafe.getLongVolatile(null, lock); if (lockCount(state) <= 0) throw new IllegalMonitorStateException("Attempted to release a read lock while not holding it " + "[lock=" + U.hexLong(lock) + ", state=" + U.hexLong(state) + ']'); long updated = updateState(state, -1, 0, 0); assert updated != 0; if (GridUnsafe.compareAndSwapLong(null, lock, state, updated)) { // Notify monitor if we were CASed to zero and there is a write waiter. if (lockCount(updated) == 0 && writersWaitCount(updated) > 0) { int idx = lockIndex(lock); ReentrantLock lockObj = locks[idx]; lockObj.lock(); try { // Note that we signal all waiters for this stripe. Since not all waiters in this // stripe/index belong to this particular lock, we can't wake up just one of them. writeConditions[idx].signalAll(); } finally { lockObj.unlock(); } } return; } } }
/** * @param lock Lock address. */ public boolean writeLock(long lock, int tag) { assert tag != 0; for (int i = 0; i < SPIN_CNT; i++) { long state = GridUnsafe.getLongVolatile(null, lock); assert state != 0; if (!checkTag(state, tag)) return false; if (canWriteLock(state)) { if (GridUnsafe.compareAndSwapLong(null, lock, state, updateState(state, -1, 0, 0))) return true; else // Retry CAS, do not count as spin cycle. i--; } } int idx = lockIndex(lock); ReentrantLock lockObj = locks[idx]; lockObj.lock(); try { updateWritersWaitCount(lock, lockObj, 1); return waitAcquireWriteLock(lock, idx, tag); } finally { lockObj.unlock(); } }
/** * @param lock Lock address. */ public void writeUnlock(long lock, int tag) { long updated; assert tag != 0; while (true) { long state = GridUnsafe.getLongVolatile(null, lock); if (lockCount(state) != -1) throw new IllegalMonitorStateException("Attempted to release write lock while not holding it " + "[lock=" + U.hexLong(lock) + ", state=" + U.hexLong(state)); updated = releaseWithTag(state, tag); assert updated != 0; if (GridUnsafe.compareAndSwapLong(null, lock, state, updated)) break; } int writeWaitCnt = writersWaitCount(updated); int readWaitCnt = readersWaitCount(updated); if (writeWaitCnt > 0 || readWaitCnt > 0) { int idx = lockIndex(lock); ReentrantLock lockObj = locks[idx]; lockObj.lock(); try { signalNextWaiter(writeWaitCnt, readWaitCnt, idx); } finally { lockObj.unlock(); } } }
int idx = lockIndex(lock);
int idx = lockIndex(lock);