31 |
|
/** |
32 |
|
* A simple mutex class, adapted from the class javadoc. Exclusive |
33 |
|
* acquire tests exercise this as a sample user extension. |
34 |
+ |
* |
35 |
+ |
* Unlike the javadoc sample, we don't track owner thread via |
36 |
+ |
* AbstractOwnableSynchronizer methods. |
37 |
|
*/ |
38 |
|
static class Mutex extends AbstractQueuedLongSynchronizer { |
39 |
|
/** An eccentric value > 32 bits for locked synchronizer state. */ |
41 |
|
|
42 |
|
static final long UNLOCKED = 0; |
43 |
|
|
44 |
< |
public boolean isHeldExclusively() { |
44 |
> |
/** Owner thread is untracked, so this is really just isLocked(). */ |
45 |
> |
@Override public boolean isHeldExclusively() { |
46 |
|
long state = getState(); |
47 |
|
assertTrue(state == UNLOCKED || state == LOCKED); |
48 |
|
return state == LOCKED; |
49 |
|
} |
50 |
|
|
51 |
< |
public boolean tryAcquire(long acquires) { |
51 |
> |
@Override protected boolean tryAcquire(long acquires) { |
52 |
|
assertEquals(LOCKED, acquires); |
53 |
|
return compareAndSetState(UNLOCKED, LOCKED); |
54 |
|
} |
55 |
|
|
56 |
< |
public boolean tryRelease(long releases) { |
56 |
> |
@Override protected boolean tryRelease(long releases) { |
57 |
|
if (getState() != LOCKED) throw new IllegalMonitorStateException(); |
58 |
|
setState(UNLOCKED); |
59 |
|
return true; |
83 |
|
release(LOCKED); |
84 |
|
} |
85 |
|
|
86 |
+ |
/** Faux-Implements Lock.newCondition(). */ |
87 |
|
public ConditionObject newCondition() { |
88 |
|
return new ConditionObject(); |
89 |
|
} |
90 |
|
} |
91 |
|
|
92 |
|
/** |
93 |
< |
* A simple latch class, to test shared mode. |
93 |
> |
* A minimal latch class, to test shared mode. |
94 |
|
*/ |
95 |
|
static class BooleanLatch extends AbstractQueuedLongSynchronizer { |
96 |
|
public boolean isSignalled() { return getState() != 0; } |