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dl |
1.1 |
/* |
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dl |
1.2 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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/* |
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dl |
1.1 |
* A simple test program. Feel free to play. |
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*/ |
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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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public final class LockLoops { |
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static final ExecutorService pool = Executors.newCachedThreadPool(); |
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static final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom(); |
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static boolean print = false; |
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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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public static void main(String[] args) throws Exception { |
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int maxThreads = 100; |
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int iters = 1000000; |
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int replications = 1; |
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jsr166 |
1.3 |
if (args.length > 0) |
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dl |
1.1 |
maxThreads = Integer.parseInt(args[0]); |
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jsr166 |
1.3 |
if (args.length > 1) |
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dl |
1.1 |
iters = Integer.parseInt(args[1]); |
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jsr166 |
1.3 |
if (args.length > 2) |
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dl |
1.1 |
replications = Integer.parseInt(args[2]); |
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rng.setSeed(3122688L); |
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print = false; |
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System.out.println("Warmup..."); |
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oneTest(3, 10000); |
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Thread.sleep(1000); |
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oneTest(2, 10000); |
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Thread.sleep(100); |
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oneTest(1, 100000); |
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Thread.sleep(100); |
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oneTest(1, 100000); |
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Thread.sleep(1000); |
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print = true; |
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for (int i = 1; i <= maxThreads; ++i) { |
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for (int j = 0; j < replications; ++j) { |
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System.out.println("Threads:" + i); |
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oneTest(i, iters / i); |
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Thread.sleep(100); |
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} |
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} |
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pool.shutdown(); |
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} |
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static void oneTest(int nthreads, int iters) throws Exception { |
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int v = rng.next(); |
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if (print) |
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System.out.print("No shared vars "); |
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new NoLockLoop().test(v, nthreads, iters * 10); |
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Thread.sleep(10); |
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if (print) |
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System.out.print("No Lock + volatile "); |
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new NoLockVolatileLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (doBuiltin) { |
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if (print) |
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System.out.print("builtin lock "); |
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new BuiltinLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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} |
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if (print) |
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System.out.print("ReentrantLock "); |
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new ReentrantLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (doReadWrite) { |
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if (print) |
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System.out.print("ReentrantWriteLock "); |
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new ReentrantWriteLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (print) |
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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); |
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} |
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if (doSemaphore) { |
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if (print) |
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System.out.print("Semaphore "); |
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new SemaphoreLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (print) |
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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); |
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} |
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if (doFair) { |
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if (print) |
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System.out.print("FairReentrantLock "); |
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new FairReentrantLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (doReadWrite) { |
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if (print) |
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System.out.print("FairRWriteLock "); |
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new FairReentrantWriteLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (print) |
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System.out.print("FairRReadWriteLock "); |
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new FairReentrantReadWriteLockLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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} |
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} |
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} |
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jsr166 |
1.6 |
abstract static class LockLoop implements Runnable { |
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dl |
1.1 |
int v; |
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int iters; |
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volatile int result; |
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final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
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CyclicBarrier barrier; |
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final void test(int initialValue, int nthreads, int iters) throws Exception { |
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v = initialValue; |
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this.iters = iters; |
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barrier = new CyclicBarrier(nthreads+1, timer); |
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jsr166 |
1.3 |
for (int i = 0; i < nthreads; ++i) |
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dl |
1.1 |
pool.execute(this); |
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barrier.await(); |
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barrier.await(); |
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long time = timer.getTime(); |
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if (print) { |
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long tpi = time / (iters * nthreads); |
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System.out.print("\t" + LoopHelpers.rightJustify(tpi) + " ns per update"); |
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jsr166 |
1.4 |
// double secs = (double) time / 1000000000.0; |
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dl |
1.1 |
// System.out.print("\t " + secs + "s run time"); |
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System.out.println(); |
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} |
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if (result == 0) // avoid overoptimization |
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System.out.println("useless result: " + result); |
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} |
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abstract int loop(int n); |
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public final void run() { |
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try { |
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jsr166 |
1.3 |
barrier.await(); |
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dl |
1.1 |
result += loop(iters); |
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barrier.await(); |
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} |
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jsr166 |
1.3 |
catch (Exception ie) { |
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return; |
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dl |
1.1 |
} |
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} |
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} |
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private static class BuiltinLockLoop extends LockLoop { |
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final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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jsr166 |
1.5 |
synchronized (this) { |
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dl |
1.1 |
v = LoopHelpers.compute1(v); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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return sum; |
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} |
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} |
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private static class NoLockLoop extends LockLoop { |
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final int loop(int n) { |
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int sum = 0; |
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int y = v; |
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while (n-- > 0) { |
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y = LoopHelpers.compute1(y); |
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sum += LoopHelpers.compute2(y); |
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} |
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return sum; |
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} |
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} |
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private static class NoLockVolatileLoop extends LockLoop { |
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jsr166 |
1.6 |
private volatile int vv; |
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dl |
1.1 |
final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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int y = LoopHelpers.compute1(vv); |
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vv = y; |
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sum += LoopHelpers.compute2(y); |
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} |
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return sum; |
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} |
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} |
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private static class ReentrantLockLoop extends LockLoop { |
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jsr166 |
1.6 |
private final ReentrantLock lock = new ReentrantLock(); |
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dl |
1.1 |
final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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lock.lock(); |
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try { |
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v = LoopHelpers.compute1(v); |
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} |
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finally { |
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lock.unlock(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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return sum; |
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} |
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} |
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private static class FairReentrantLockLoop extends LockLoop { |
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jsr166 |
1.6 |
private final ReentrantLock lock = new ReentrantLock(true); |
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dl |
1.1 |
final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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lock.lock(); |
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try { |
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v = LoopHelpers.compute1(v); |
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} |
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finally { |
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lock.unlock(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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return sum; |
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} |
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} |
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private static class ReentrantWriteLockLoop extends LockLoop { |
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jsr166 |
1.6 |
private final Lock lock = new ReentrantReadWriteLock().writeLock(); |
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dl |
1.1 |
final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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lock.lock(); |
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try { |
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v = LoopHelpers.compute1(v); |
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} |
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finally { |
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lock.unlock(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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return sum; |
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} |
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} |
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private static class ReentrantReadWriteLockLoop extends LockLoop { |
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jsr166 |
1.6 |
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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dl |
1.1 |
final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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int x; |
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lock.readLock().lock(); |
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try { |
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x = LoopHelpers.compute1(v); |
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} |
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finally { |
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lock.readLock().unlock(); |
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} |
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lock.writeLock().lock(); |
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try { |
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v = x; |
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} |
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finally { |
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lock.writeLock().unlock(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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return sum; |
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} |
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} |
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private static class FairReentrantWriteLockLoop extends LockLoop { |
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final Lock lock = new ReentrantReadWriteLock(true).writeLock(); |
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final int loop(int n) { |
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int sum = 0; |
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while (n-- > 0) { |
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lock.lock(); |
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try { |
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v = LoopHelpers.compute1(v); |
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} |
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finally { |
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lock.unlock(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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return sum; |
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} |
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} |
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private static class SemaphoreLoop extends LockLoop { |
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jsr166 |
1.6 |
private final Semaphore sem = new Semaphore(1, false); |
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dl |
1.1 |
final int loop(int n) { |
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int sum = 0; |
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try { |
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while (n-- > 0) { |
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sem.acquire(); |
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try { |
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v = LoopHelpers.compute1(v); |
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} |
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finally { |
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sem.release(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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} |
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catch (InterruptedException ie) { |
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return sum; |
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} |
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return sum; |
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} |
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} |
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private static class FairSemaphoreLoop extends LockLoop { |
334 |
jsr166 |
1.6 |
private final Semaphore sem = new Semaphore(1, true); |
335 |
dl |
1.1 |
final int loop(int n) { |
336 |
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int sum = 0; |
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try { |
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while (n-- > 0) { |
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sem.acquire(); |
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try { |
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v = LoopHelpers.compute1(v); |
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} |
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finally { |
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sem.release(); |
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} |
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sum += LoopHelpers.compute2(v); |
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} |
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} |
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catch (InterruptedException ie) { |
350 |
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return sum; |
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} |
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return sum; |
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} |
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} |
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private static class FairReentrantReadWriteLockLoop extends LockLoop { |
357 |
jsr166 |
1.6 |
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
358 |
dl |
1.1 |
final int loop(int n) { |
359 |
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int sum = 0; |
360 |
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while (n-- > 0) { |
361 |
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int x; |
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lock.readLock().lock(); |
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try { |
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x = LoopHelpers.compute1(v); |
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} |
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finally { |
367 |
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lock.readLock().unlock(); |
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} |
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lock.writeLock().lock(); |
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try { |
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v = x; |
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} |
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finally { |
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lock.writeLock().unlock(); |
375 |
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} |
376 |
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sum += LoopHelpers.compute2(v); |
377 |
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} |
378 |
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return sum; |
379 |
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} |
380 |
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} |
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383 |
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} |