70 |
|
assertFalse(s0.isFair()); |
71 |
|
Semaphore s1 = new Semaphore(-1, false); |
72 |
|
assertEquals(-1, s1.availablePermits()); |
73 |
+ |
assertFalse(s1.isFair()); |
74 |
|
Semaphore s2 = new Semaphore(-1, false); |
75 |
|
assertEquals(-1, s2.availablePermits()); |
76 |
+ |
assertFalse(s2.isFair()); |
77 |
|
} |
78 |
|
|
79 |
|
/** |
80 |
< |
* tryAcquire succeeds when sufficent permits, else fails |
80 |
> |
* Constructor without fairness argument behaves as nonfair |
81 |
> |
*/ |
82 |
> |
public void testConstructor2() { |
83 |
> |
Semaphore s0 = new Semaphore(0); |
84 |
> |
assertEquals(0, s0.availablePermits()); |
85 |
> |
assertFalse(s0.isFair()); |
86 |
> |
Semaphore s1 = new Semaphore(-1); |
87 |
> |
assertEquals(-1, s1.availablePermits()); |
88 |
> |
assertFalse(s1.isFair()); |
89 |
> |
Semaphore s2 = new Semaphore(-1); |
90 |
> |
assertEquals(-1, s2.availablePermits()); |
91 |
> |
assertFalse(s2.isFair()); |
92 |
> |
} |
93 |
> |
|
94 |
> |
/** |
95 |
> |
* tryAcquire succeeds when sufficient permits, else fails |
96 |
|
*/ |
97 |
|
public void testTryAcquireInSameThread() { |
98 |
|
Semaphore s = new Semaphore(2, false); |
397 |
|
} |
398 |
|
} |
399 |
|
|
400 |
+ |
/** |
401 |
+ |
* drainPermits reports and removes given number of permits |
402 |
+ |
*/ |
403 |
+ |
public void testDrainPermits() { |
404 |
+ |
Semaphore s = new Semaphore(0, false); |
405 |
+ |
assertEquals(0, s.availablePermits()); |
406 |
+ |
assertEquals(0, s.drainPermits()); |
407 |
+ |
s.release(10); |
408 |
+ |
assertEquals(10, s.availablePermits()); |
409 |
+ |
assertEquals(10, s.drainPermits()); |
410 |
+ |
assertEquals(0, s.availablePermits()); |
411 |
+ |
assertEquals(0, s.drainPermits()); |
412 |
+ |
} |
413 |
|
|
414 |
|
/** |
415 |
|
* reducePermits reduces number of permits |
463 |
|
} |
464 |
|
|
465 |
|
/** |
466 |
< |
* tryAcquire succeeds when sufficent permits, else fails |
466 |
> |
* tryAcquire succeeds when sufficient permits, else fails |
467 |
|
*/ |
468 |
|
public void testTryAcquireInSameThread_fair() { |
469 |
|
Semaphore s = new Semaphore(2, true); |
475 |
|
} |
476 |
|
|
477 |
|
/** |
478 |
< |
* tryAcquire(n) succeeds when sufficent permits, else fails |
478 |
> |
* tryAcquire(n) succeeds when sufficient permits, else fails |
479 |
|
*/ |
480 |
|
public void testTryAcquireNInSameThread_fair() { |
481 |
|
Semaphore s = new Semaphore(2, true); |
635 |
|
Thread t = new Thread(new Runnable() { |
636 |
|
public void run() { |
637 |
|
try { |
638 |
+ |
s.acquire(); |
639 |
+ |
s.release(2); |
640 |
+ |
s.acquire(); |
641 |
+ |
} catch(InterruptedException ie){ |
642 |
+ |
threadUnexpectedException(); |
643 |
+ |
} |
644 |
+ |
} |
645 |
+ |
}); |
646 |
+ |
try { |
647 |
+ |
t.start(); |
648 |
+ |
Thread.sleep(SHORT_DELAY_MS); |
649 |
+ |
s.release(2); |
650 |
+ |
s.acquire(2); |
651 |
+ |
s.release(1); |
652 |
+ |
t.join(); |
653 |
+ |
} catch( InterruptedException e){ |
654 |
+ |
unexpectedException(); |
655 |
+ |
} |
656 |
+ |
} |
657 |
+ |
|
658 |
+ |
/** |
659 |
+ |
* release(n) in one thread enables acquire(n) in another thread |
660 |
+ |
*/ |
661 |
+ |
public void testAcquireReleaseNInDifferentThreads_fair2() { |
662 |
+ |
final Semaphore s = new Semaphore(0, true); |
663 |
+ |
Thread t = new Thread(new Runnable() { |
664 |
+ |
public void run() { |
665 |
+ |
try { |
666 |
|
s.acquire(2); |
667 |
|
s.acquire(2); |
668 |
|
s.release(4); |
686 |
|
|
687 |
|
|
688 |
|
|
689 |
+ |
|
690 |
+ |
|
691 |
|
/** |
692 |
|
* release in one thread enables timed acquire in another thread |
693 |
|
*/ |
899 |
|
} |
900 |
|
} |
901 |
|
|
902 |
+ |
/** |
903 |
+ |
* toString indicates current number of permits |
904 |
+ |
*/ |
905 |
+ |
public void testToString() { |
906 |
+ |
Semaphore s = new Semaphore(0); |
907 |
+ |
String us = s.toString(); |
908 |
+ |
assertTrue(us.indexOf("Permits = 0") >= 0); |
909 |
+ |
s.release(); |
910 |
+ |
String s1 = s.toString(); |
911 |
+ |
assertTrue(s1.indexOf("Permits = 1") >= 0); |
912 |
+ |
s.release(); |
913 |
+ |
String s2 = s.toString(); |
914 |
+ |
assertTrue(s2.indexOf("Permits = 2") >= 0); |
915 |
+ |
} |
916 |
|
|
917 |
|
} |