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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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jsr166 |
1.9 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
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dl |
1.2 |
*/ |
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/* |
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dl |
1.1 |
* @test |
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* @summary basic safety and liveness of ReentrantLocks, and other locks based on them |
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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 UncheckedLockLoops { |
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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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public static void main(String[] args) throws Exception { |
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int maxThreads = 100; |
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int iters = 10000000; |
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jsr166 |
1.4 |
if (args.length > 0) |
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dl |
1.1 |
maxThreads = Integer.parseInt(args[0]); |
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rng.setSeed(3122688L); |
28 |
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print = false; |
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System.out.println("Warmup..."); |
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oneTest(1, 100000); |
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Thread.sleep(1000); |
33 |
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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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System.out.println("Threads:" + 1); |
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oneTest(1, iters / 1); |
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Thread.sleep(100); |
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for (int i = 1; i <= maxThreads; i += (i+1) >>> 1) { |
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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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static void oneTest(int nthreads, int iters) throws Exception { |
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jsr166 |
1.5 |
int fairIters = (nthreads <= 1) ? iters : iters/20; |
57 |
dl |
1.1 |
int v = rng.next(); |
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if (print) |
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System.out.print("NoLock (1 thread) "); |
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new NoLockLoop().test(v, 1, iters * nthreads); |
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Thread.sleep(10); |
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jsr166 |
1.4 |
|
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dl |
1.1 |
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 (false) { |
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if (print) |
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System.out.print("FairReentrantLock "); |
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new FairReentrantLockLoop().test(v, nthreads, fairIters); |
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Thread.sleep(10); |
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} |
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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, fairIters); |
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Thread.sleep(10); |
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} |
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if (print) |
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System.out.print("Mutex "); |
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new MutexLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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if (print) |
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System.out.print("LongMutex "); |
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new LongMutexLoop().test(v, nthreads, iters); |
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Thread.sleep(10); |
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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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jsr166 |
1.4 |
|
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dl |
1.1 |
if (print) |
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System.out.print("FairSemaphore "); |
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new FairSemaphoreLoop().test(v, nthreads, fairIters); |
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Thread.sleep(10); |
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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("FairRWriteLock "); |
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new FairReentrantWriteLockLoop().test(v, nthreads, fairIters); |
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Thread.sleep(10); |
111 |
jsr166 |
1.4 |
|
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dl |
1.1 |
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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jsr166 |
1.4 |
|
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dl |
1.1 |
if (print) |
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System.out.print("FairRReadWriteLock "); |
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new FairReentrantReadWriteLockLoop().test(v, nthreads, fairIters); |
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Thread.sleep(10); |
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} |
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jsr166 |
1.8 |
abstract static class LockLoop implements Runnable { |
125 |
dl |
1.1 |
int value; |
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int checkValue; |
127 |
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int iters; |
128 |
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volatile int result; |
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volatile int failures; |
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final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
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CyclicBarrier barrier; |
132 |
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final int setValue(int v) { |
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checkValue = v ^ 0x55555555; |
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value = v; |
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return v; |
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} |
138 |
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final int getValue() { |
140 |
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int v = value; |
141 |
jsr166 |
1.4 |
if (checkValue != ~(v ^ 0xAAAAAAAA)) |
142 |
dl |
1.1 |
++failures; |
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return v; |
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} |
145 |
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final void test(int initialValue, int nthreads, int iters) throws Exception { |
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setValue(initialValue); |
148 |
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this.iters = iters; |
149 |
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barrier = new CyclicBarrier(nthreads+1, timer); |
150 |
jsr166 |
1.4 |
for (int i = 0; i < nthreads; ++i) |
151 |
dl |
1.1 |
new Thread(this).start(); |
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barrier.await(); |
153 |
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barrier.await(); |
154 |
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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"); |
158 |
jsr166 |
1.6 |
// double secs = (double) time / 1000000000.0; |
159 |
dl |
1.1 |
// System.out.print("\t " + secs + "s run time"); |
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System.out.println(); |
161 |
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} |
162 |
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163 |
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if (result == 0) // avoid overoptimization |
164 |
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System.out.println("useless result: " + result); |
165 |
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if (failures != 0) |
166 |
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throw new Error("protection failure?"); |
167 |
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} |
168 |
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abstract int loop(int n); |
169 |
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public final void run() { |
170 |
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try { |
171 |
jsr166 |
1.4 |
barrier.await(); |
172 |
dl |
1.1 |
result += loop(iters); |
173 |
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barrier.await(); |
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} |
175 |
jsr166 |
1.4 |
catch (Exception ie) { |
176 |
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return; |
177 |
dl |
1.1 |
} |
178 |
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} |
179 |
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180 |
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} |
181 |
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182 |
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private static class NoLockLoop extends LockLoop { |
183 |
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private volatile int readBarrier; |
184 |
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final int loop(int n) { |
185 |
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int sum = 0; |
186 |
jsr166 |
1.3 |
int x = 0; |
187 |
dl |
1.1 |
while (n-- > 0) { |
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int r1 = readBarrier; |
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x = setValue(LoopHelpers.compute1(getValue())); |
190 |
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int r2 = readBarrier; |
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if (r1 == r2 && (x & 255) == 0) |
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++readBarrier; |
193 |
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sum += LoopHelpers.compute2(x); |
194 |
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} |
195 |
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return sum; |
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} |
197 |
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} |
198 |
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199 |
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private static class BuiltinLockLoop extends LockLoop { |
200 |
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final int loop(int n) { |
201 |
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int sum = 0; |
202 |
jsr166 |
1.3 |
int x = 0; |
203 |
dl |
1.1 |
while (n-- > 0) { |
204 |
jsr166 |
1.7 |
synchronized (this) { |
205 |
dl |
1.1 |
x = setValue(LoopHelpers.compute1(getValue())); |
206 |
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} |
207 |
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sum += LoopHelpers.compute2(x); |
208 |
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} |
209 |
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return sum; |
210 |
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} |
211 |
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} |
212 |
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213 |
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private static class ReentrantLockLoop extends LockLoop { |
214 |
jsr166 |
1.8 |
private final ReentrantLock lock = new ReentrantLock(); |
215 |
dl |
1.1 |
final int loop(int n) { |
216 |
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final ReentrantLock lock = this.lock; |
217 |
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int sum = 0; |
218 |
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int x = 0; |
219 |
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while (n-- > 0) { |
220 |
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lock.lock(); |
221 |
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try { |
222 |
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x = setValue(LoopHelpers.compute1(getValue())); |
223 |
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} |
224 |
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finally { |
225 |
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lock.unlock(); |
226 |
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} |
227 |
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sum += LoopHelpers.compute2(x); |
228 |
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} |
229 |
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return sum; |
230 |
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} |
231 |
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} |
232 |
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233 |
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private static class MutexLoop extends LockLoop { |
234 |
jsr166 |
1.8 |
private final Mutex lock = new Mutex(); |
235 |
dl |
1.1 |
final int loop(int n) { |
236 |
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final Mutex lock = this.lock; |
237 |
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int sum = 0; |
238 |
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int x = 0; |
239 |
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while (n-- > 0) { |
240 |
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lock.lock(); |
241 |
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try { |
242 |
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x = setValue(LoopHelpers.compute1(getValue())); |
243 |
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} |
244 |
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finally { |
245 |
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lock.unlock(); |
246 |
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} |
247 |
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sum += LoopHelpers.compute2(x); |
248 |
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} |
249 |
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return sum; |
250 |
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} |
251 |
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} |
252 |
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253 |
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private static class LongMutexLoop extends LockLoop { |
254 |
jsr166 |
1.8 |
private final LongMutex lock = new LongMutex(); |
255 |
dl |
1.1 |
final int loop(int n) { |
256 |
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final LongMutex lock = this.lock; |
257 |
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int sum = 0; |
258 |
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int x = 0; |
259 |
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while (n-- > 0) { |
260 |
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lock.lock(); |
261 |
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try { |
262 |
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x = setValue(LoopHelpers.compute1(getValue())); |
263 |
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} |
264 |
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finally { |
265 |
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lock.unlock(); |
266 |
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} |
267 |
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sum += LoopHelpers.compute2(x); |
268 |
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} |
269 |
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return sum; |
270 |
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} |
271 |
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} |
272 |
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273 |
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private static class FairReentrantLockLoop extends LockLoop { |
274 |
jsr166 |
1.8 |
private final ReentrantLock lock = new ReentrantLock(true); |
275 |
dl |
1.1 |
final int loop(int n) { |
276 |
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final ReentrantLock lock = this.lock; |
277 |
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int sum = 0; |
278 |
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int x = 0; |
279 |
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while (n-- > 0) { |
280 |
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lock.lock(); |
281 |
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try { |
282 |
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x = setValue(LoopHelpers.compute1(getValue())); |
283 |
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} |
284 |
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finally { |
285 |
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lock.unlock(); |
286 |
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} |
287 |
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sum += LoopHelpers.compute2(x); |
288 |
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} |
289 |
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return sum; |
290 |
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} |
291 |
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} |
292 |
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293 |
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private static class ReentrantWriteLockLoop extends LockLoop { |
294 |
jsr166 |
1.8 |
private final Lock lock = new ReentrantReadWriteLock().writeLock(); |
295 |
dl |
1.1 |
final int loop(int n) { |
296 |
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final Lock lock = this.lock; |
297 |
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int sum = 0; |
298 |
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int x = 0; |
299 |
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while (n-- > 0) { |
300 |
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lock.lock(); |
301 |
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try { |
302 |
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x = setValue(LoopHelpers.compute1(getValue())); |
303 |
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} |
304 |
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finally { |
305 |
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lock.unlock(); |
306 |
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} |
307 |
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sum += LoopHelpers.compute2(x); |
308 |
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} |
309 |
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return sum; |
310 |
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} |
311 |
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} |
312 |
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313 |
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private static class FairReentrantWriteLockLoop extends LockLoop { |
314 |
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final Lock lock = new ReentrantReadWriteLock(true).writeLock(); |
315 |
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final int loop(int n) { |
316 |
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final Lock lock = this.lock; |
317 |
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int sum = 0; |
318 |
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int x = 0; |
319 |
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while (n-- > 0) { |
320 |
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lock.lock(); |
321 |
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try { |
322 |
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x = setValue(LoopHelpers.compute1(getValue())); |
323 |
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} |
324 |
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finally { |
325 |
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lock.unlock(); |
326 |
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} |
327 |
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sum += LoopHelpers.compute2(x); |
328 |
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} |
329 |
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return sum; |
330 |
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} |
331 |
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} |
332 |
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|
333 |
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private static class SemaphoreLoop extends LockLoop { |
334 |
jsr166 |
1.8 |
private final Semaphore sem = new Semaphore(1, false); |
335 |
dl |
1.1 |
final int loop(int n) { |
336 |
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final Semaphore sem = this.sem; |
337 |
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int sum = 0; |
338 |
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int x = 0; |
339 |
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while (n-- > 0) { |
340 |
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sem.acquireUninterruptibly(); |
341 |
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try { |
342 |
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x = setValue(LoopHelpers.compute1(getValue())); |
343 |
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} |
344 |
|
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finally { |
345 |
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sem.release(); |
346 |
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} |
347 |
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sum += LoopHelpers.compute2(x); |
348 |
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} |
349 |
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return sum; |
350 |
|
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} |
351 |
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} |
352 |
|
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private static class FairSemaphoreLoop extends LockLoop { |
353 |
jsr166 |
1.8 |
private final Semaphore sem = new Semaphore(1, true); |
354 |
dl |
1.1 |
final int loop(int n) { |
355 |
|
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final Semaphore sem = this.sem; |
356 |
|
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int sum = 0; |
357 |
|
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int x = 0; |
358 |
|
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while (n-- > 0) { |
359 |
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sem.acquireUninterruptibly(); |
360 |
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try { |
361 |
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x = setValue(LoopHelpers.compute1(getValue())); |
362 |
|
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} |
363 |
|
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finally { |
364 |
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sem.release(); |
365 |
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} |
366 |
|
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sum += LoopHelpers.compute2(x); |
367 |
|
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} |
368 |
|
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return sum; |
369 |
|
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} |
370 |
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} |
371 |
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|
372 |
|
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private static class ReentrantReadWriteLockLoop extends LockLoop { |
373 |
jsr166 |
1.8 |
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
374 |
dl |
1.1 |
final int loop(int n) { |
375 |
|
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final Lock rlock = lock.readLock(); |
376 |
|
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final Lock wlock = lock.writeLock(); |
377 |
|
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int sum = 0; |
378 |
|
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int x = 0; |
379 |
|
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while (n-- > 0) { |
380 |
|
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if ((n & 16) != 0) { |
381 |
|
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rlock.lock(); |
382 |
|
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try { |
383 |
|
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x = LoopHelpers.compute1(getValue()); |
384 |
|
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x = LoopHelpers.compute2(x); |
385 |
|
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} |
386 |
|
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finally { |
387 |
|
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rlock.unlock(); |
388 |
|
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} |
389 |
|
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} |
390 |
|
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else { |
391 |
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wlock.lock(); |
392 |
|
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try { |
393 |
|
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setValue(x); |
394 |
|
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} |
395 |
|
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finally { |
396 |
|
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wlock.unlock(); |
397 |
|
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} |
398 |
|
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sum += LoopHelpers.compute2(x); |
399 |
|
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} |
400 |
|
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} |
401 |
|
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return sum; |
402 |
|
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} |
403 |
|
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|
404 |
|
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} |
405 |
|
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|
406 |
|
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|
407 |
|
|
private static class FairReentrantReadWriteLockLoop extends LockLoop { |
408 |
jsr166 |
1.8 |
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
409 |
dl |
1.1 |
final int loop(int n) { |
410 |
|
|
final Lock rlock = lock.readLock(); |
411 |
|
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final Lock wlock = lock.writeLock(); |
412 |
|
|
int sum = 0; |
413 |
|
|
int x = 0; |
414 |
|
|
while (n-- > 0) { |
415 |
|
|
if ((n & 16) != 0) { |
416 |
|
|
rlock.lock(); |
417 |
|
|
try { |
418 |
|
|
x = LoopHelpers.compute1(getValue()); |
419 |
|
|
x = LoopHelpers.compute2(x); |
420 |
|
|
} |
421 |
|
|
finally { |
422 |
|
|
rlock.unlock(); |
423 |
|
|
} |
424 |
|
|
} |
425 |
|
|
else { |
426 |
|
|
wlock.lock(); |
427 |
|
|
try { |
428 |
|
|
setValue(x); |
429 |
|
|
} |
430 |
|
|
finally { |
431 |
|
|
wlock.unlock(); |
432 |
|
|
} |
433 |
|
|
sum += LoopHelpers.compute2(x); |
434 |
|
|
} |
435 |
|
|
} |
436 |
|
|
return sum; |
437 |
|
|
} |
438 |
|
|
|
439 |
|
|
} |
440 |
|
|
} |