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; |