| 19 |
|
if (args.length > 0) |
| 20 |
|
maxThreads = Integer.parseInt(args[0]); |
| 21 |
|
|
| 22 |
< |
new ReentrantLockLoop(1).test(); |
| 23 |
< |
new ReentrantLockLoop(1).test(); |
| 22 |
> |
new LockLoop(1).test(); |
| 23 |
> |
new LockLoop(1).test(); |
| 24 |
|
print = true; |
| 25 |
|
|
| 26 |
|
int k = 1; |
| 27 |
|
for (int i = 1; i <= maxThreads;) { |
| 28 |
|
System.out.print("Threads: " + i); |
| 29 |
< |
new ReentrantLockLoop(i).test(); |
| 29 |
> |
new LockLoop(i).test(); |
| 30 |
|
Thread.sleep(100); |
| 31 |
|
if (i == k) { |
| 32 |
|
k = i << 1; |
| 38 |
|
pool.shutdown(); |
| 39 |
|
} |
| 40 |
|
|
| 41 |
< |
static final class ReentrantLockLoop implements Runnable { |
| 41 |
> |
static final class LockLoop implements Runnable { |
| 42 |
|
private int v = rng.next(); |
| 43 |
|
private volatile int result = 17; |
| 44 |
+ |
private final Object lock = new Object(); |
| 45 |
|
private final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
| 46 |
|
private final CyclicBarrier barrier; |
| 47 |
|
private final int nthreads; |
| 48 |
|
private volatile int readBarrier; |
| 49 |
< |
ReentrantLockLoop(int nthreads) { |
| 49 |
> |
LockLoop(int nthreads) { |
| 50 |
|
this.nthreads = nthreads; |
| 51 |
|
barrier = new CyclicBarrier(nthreads+1, timer); |
| 52 |
|
} |
| 70 |
|
} |
| 71 |
|
|
| 72 |
|
public final void run() { |
| 73 |
+ |
final Object lock = this.lock; |
| 74 |
|
try { |
| 75 |
|
barrier.await(); |
| 76 |
|
int sum = v + 1; |
| 77 |
|
int x = 0; |
| 78 |
|
int n = iters; |
| 79 |
|
while (n-- > 0) { |
| 80 |
< |
synchronized(this) { |
| 80 |
> |
synchronized(lock) { |
| 81 |
|
int k = (sum & 3); |
| 82 |
|
if (k > 0) { |
| 83 |
|
x = v; |
