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* A simple test program. Feel free to play. |
8 |
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*/ |
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10 |
+ |
import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.concurrent.locks.*; |
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– |
import java.util.*; |
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|
14 |
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public final class LockLoops { |
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static final ExecutorService pool = Executors.newCachedThreadPool(); |
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static boolean doBuiltin = true; |
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static boolean doReadWrite = true; |
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static boolean doSemaphore = true; |
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< |
static boolean doFair = true; |
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> |
static boolean doStampedLock = true; |
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> |
static boolean doFair = true; |
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|
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public static void main(String[] args) throws Exception { |
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int maxThreads = 100; |
94 |
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System.out.print("ReentrantReadWriteLock"); |
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new ReentrantReadWriteLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
96 |
– |
|
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} |
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|
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if (doSemaphore) { |
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System.out.print("FairSemaphore "); |
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new FairSemaphoreLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
109 |
– |
|
109 |
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} |
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|
111 |
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if (doFair) { |
125 |
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new FairReentrantReadWriteLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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} |
129 |
– |
|
128 |
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} |
129 |
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|
130 |
+ |
if (doStampedLock) { |
131 |
+ |
if (print) |
132 |
+ |
System.out.print("StampedLockWrite "); |
133 |
+ |
new StampedLockWriteLoop().test(v, nthreads, iters); |
134 |
+ |
Thread.sleep(10); |
135 |
+ |
|
136 |
+ |
if (print) |
137 |
+ |
System.out.print("StampedLockRead "); |
138 |
+ |
new StampedLockReadLoop().test(v, nthreads, iters); |
139 |
+ |
Thread.sleep(10); |
140 |
+ |
|
141 |
+ |
if (print) |
142 |
+ |
System.out.print("StampedLockOptRead"); |
143 |
+ |
new StampedLockOptimisticReadLoop().test(v, nthreads, iters); |
144 |
+ |
Thread.sleep(10); |
145 |
+ |
|
146 |
+ |
if (print) |
147 |
+ |
System.out.print("StampedLockReadWrite"); |
148 |
+ |
new StampedLockReadWriteLoop().test(v, nthreads, iters); |
149 |
+ |
Thread.sleep(10); |
150 |
+ |
} |
151 |
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} |
152 |
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|
153 |
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abstract static class LockLoop implements Runnable { |
349 |
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return sum; |
350 |
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} |
351 |
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} |
352 |
+ |
|
353 |
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private static class FairSemaphoreLoop extends LockLoop { |
354 |
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private final Semaphore sem = new Semaphore(1, true); |
355 |
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final int loop(int n) { |
399 |
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} |
400 |
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} |
401 |
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|
402 |
+ |
private static class StampedLockWriteLoop extends LockLoop { |
403 |
+ |
private final StampedLock lock = new StampedLock(); |
404 |
+ |
final int loop(int n) { |
405 |
+ |
int sum = 0; |
406 |
+ |
while (n-- > 0) { |
407 |
+ |
long stamp = lock.writeLock(); |
408 |
+ |
try { |
409 |
+ |
v = LoopHelpers.compute1(v); |
410 |
+ |
} |
411 |
+ |
finally { |
412 |
+ |
lock.unlockWrite(stamp); |
413 |
+ |
} |
414 |
+ |
sum += LoopHelpers.compute2(v); |
415 |
+ |
} |
416 |
+ |
return sum; |
417 |
+ |
} |
418 |
+ |
} |
419 |
+ |
|
420 |
+ |
private static class StampedLockReadLoop extends LockLoop { |
421 |
+ |
private final StampedLock lock = new StampedLock(); |
422 |
+ |
final int loop(int n) { |
423 |
+ |
int sum = 0; |
424 |
+ |
while (n-- > 0) { |
425 |
+ |
long stamp = lock.readLock(); |
426 |
+ |
try { |
427 |
+ |
v = LoopHelpers.compute1(v); |
428 |
+ |
} |
429 |
+ |
finally { |
430 |
+ |
lock.unlockRead(stamp); |
431 |
+ |
} |
432 |
+ |
sum += LoopHelpers.compute2(v); |
433 |
+ |
} |
434 |
+ |
return sum; |
435 |
+ |
} |
436 |
+ |
} |
437 |
+ |
|
438 |
+ |
private static class StampedLockOptimisticReadLoop extends LockLoop { |
439 |
+ |
private final StampedLock lock = new StampedLock(); |
440 |
+ |
final int loop(int n) { |
441 |
+ |
int sum = 0; |
442 |
+ |
while (n-- > 0) { |
443 |
+ |
long stamp; |
444 |
+ |
do { |
445 |
+ |
stamp = lock.tryOptimisticRead(); |
446 |
+ |
v = LoopHelpers.compute1(v); |
447 |
+ |
} while (!lock.validate(stamp)); |
448 |
+ |
sum += LoopHelpers.compute2(v); |
449 |
+ |
} |
450 |
+ |
return sum; |
451 |
+ |
} |
452 |
+ |
} |
453 |
|
|
454 |
+ |
private static class StampedLockReadWriteLoop extends LockLoop { |
455 |
+ |
private final StampedLock lock = new StampedLock(); |
456 |
+ |
final int loop(int n) { |
457 |
+ |
int sum = 0; |
458 |
+ |
while (n-- > 0) { |
459 |
+ |
int x; |
460 |
+ |
long stamp = lock.readLock(); |
461 |
+ |
try { |
462 |
+ |
x = LoopHelpers.compute1(v); |
463 |
+ |
} |
464 |
+ |
finally { |
465 |
+ |
lock.unlockRead(stamp); |
466 |
+ |
} |
467 |
+ |
stamp = lock.writeLock(); |
468 |
+ |
try { |
469 |
+ |
v = x; |
470 |
+ |
} finally { |
471 |
+ |
lock.unlockWrite(stamp); |
472 |
+ |
} |
473 |
+ |
sum += LoopHelpers.compute2(v); |
474 |
+ |
} |
475 |
+ |
return sum; |
476 |
+ |
} |
477 |
+ |
} |
478 |
|
} |