ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/jsr166/jsr166/src/test/loops/SimpleWriteLockLoops.java
(Generate patch)

Comparing jsr166/src/test/loops/SimpleWriteLockLoops.java (file contents):
Revision 1.1 by dl, Mon May 2 19:19:38 2005 UTC vs.
Revision 1.8 by jsr166, Sat Dec 31 02:09:24 2016 UTC

# Line 1 | Line 1
1   /*
2 – * @test
3 – * @synopsis multiple threads using a single lock
4 – */
5 – /*
2   * Written by Doug Lea with assistance from members of JCP JSR-166
3 < * Expert Group and released to the public domain. Use, modify, and
4 < * redistribute this code in any way without acknowledgement.
3 > * Expert Group and released to the public domain, as explained at
4 > * http://creativecommons.org/publicdomain/zero/1.0/
5   */
6  
7 < import java.util.concurrent.*;
8 < import java.util.concurrent.locks.*;
9 < import java.util.*;
7 > import java.util.concurrent.CyclicBarrier;
8 > import java.util.concurrent.ExecutorService;
9 > import java.util.concurrent.Executors;
10 > import java.util.concurrent.locks.Lock;
11 > import java.util.concurrent.locks.ReentrantReadWriteLock;
12  
13   public final class SimpleWriteLockLoops {
14      static final ExecutorService pool = Executors.newCachedThreadPool();
# Line 20 | Line 18 | public final class SimpleWriteLockLoops
18  
19      public static void main(String[] args) throws Exception {
20          int maxThreads = 100;
21 <        if (args.length > 0)
21 >        if (args.length > 0)
22              maxThreads = Integer.parseInt(args[0]);
23  
24          print = true;
# Line 52 | Line 50 | public final class SimpleWriteLockLoops
50          }
51  
52          final void test() throws Exception {
53 <            for (int i = 0; i < nthreads; ++i)
53 >            for (int i = 0; i < nthreads; ++i)
54                  pool.execute(this);
55              barrier.await();
56              barrier.await();
57              if (print) {
58                  long time = timer.getTime();
59 <                long tpi = time / ((long)iters * nthreads);
59 >                long tpi = time / ((long) iters * nthreads);
60                  System.out.print("\t" + LoopHelpers.rightJustify(tpi) + " ns per lock");
61 <                double secs = (double)(time) / 1000000000.0;
61 >                double secs = (double) time / 1000000000.0;
62                  System.out.println("\t " + secs + "s run time");
63              }
64  
# Line 72 | Line 70 | public final class SimpleWriteLockLoops
70          public final void run() {
71              final Lock lock = this.lock.writeLock();
72              try {
73 <                barrier.await();
73 >                barrier.await();
74                  int sum = v + 1;
75                  int x = 0;
76                  int n = iters;
# Line 82 | Line 80 | public final class SimpleWriteLockLoops
80                      if (k > 0) {
81                          x = v;
82                          while (k-- > 0)
83 <                            x = LoopHelpers.compute4(x);
83 >                            x = LoopHelpers.compute6(x);
84                          v = x;
85                      }
86                      else x = sum + 1;
# Line 90 | Line 88 | public final class SimpleWriteLockLoops
88                      if ((x += readBarrier) == 0)
89                          ++readBarrier;
90                      for (int l = x & 7; l > 0; --l)
91 <                        sum += LoopHelpers.compute4(sum);
92 <                }
91 >                        sum += LoopHelpers.compute6(sum);
92 >                }
93                  barrier.await();
94                  result += sum;
95              }
96 <            catch (Exception ie) {
97 <                return;
96 >            catch (Exception ie) {
97 >                return;
98              }
99          }
100      }

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines