| 30 |
|
*/ |
| 31 |
|
static class Mutex implements Lock, java.io.Serializable { |
| 32 |
|
private static class Sync extends AbstractQueuedSynchronizer { |
| 33 |
< |
public int acquireExclusiveState(boolean isQueued, int acquires) { |
| 33 |
> |
boolean isLocked() { return getState() == 1; } |
| 34 |
> |
|
| 35 |
> |
public boolean tryAcquireExclusiveState(boolean isQueued, int acquires) { |
| 36 |
|
assert acquires == 1; // Does not use multiple acquires |
| 37 |
< |
return compareAndSet(0, 1)? 0 : -1; |
| 37 |
> |
return compareAndSetState(0, 1); |
| 38 |
|
} |
| 39 |
|
|
| 40 |
|
public boolean releaseExclusiveState(int releases) { |
| 41 |
< |
set(0); |
| 41 |
> |
setState(0); |
| 42 |
|
return true; |
| 43 |
|
} |
| 44 |
|
|
| 45 |
|
public void checkConditionAccess(Thread thread, boolean waiting) { |
| 46 |
< |
if (get() == 0) throw new IllegalMonitorStateException(); |
| 46 |
> |
if (getState() == 0) throw new IllegalMonitorStateException(); |
| 47 |
|
} |
| 48 |
|
|
| 49 |
|
Condition newCondition() { return new ConditionObject(); } |
| 50 |
|
|
| 51 |
|
private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException { |
| 52 |
|
s.defaultReadObject(); |
| 53 |
< |
set(0); // reset to unlocked state |
| 53 |
> |
setState(0); // reset to unlocked state |
| 54 |
|
} |
| 55 |
|
} |
| 56 |
|
|
| 57 |
|
private final Sync sync = new Sync(); |
| 58 |
|
public boolean tryLock() { |
| 59 |
< |
return sync.acquireExclusiveState(false, 1) >= 0; |
| 59 |
> |
return sync.tryAcquireExclusiveState(false, 1); |
| 60 |
|
} |
| 61 |
|
public void lock() { |
| 62 |
|
sync.acquireExclusiveUninterruptibly(1); |
| 69 |
|
} |
| 70 |
|
public void unlock() { sync.releaseExclusive(1); } |
| 71 |
|
public Condition newCondition() { return sync.newCondition(); } |
| 72 |
< |
public boolean isLocked() { return sync.get() != 0; } |
| 72 |
> |
public boolean isLocked() { return sync.isLocked(); } |
| 73 |
|
public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); } |
| 74 |
|
} |
| 75 |
|
|
