--- jsr166/src/test/loops/NoopSpinLockLoops.java	2005/05/02 19:19:38	1.1
+++ jsr166/src/test/loops/NoopSpinLockLoops.java	2016/12/31 18:54:28	1.9
@@ -1,17 +1,14 @@
 /*
- * @test
- * @synopsis multiple threads using a single builtin lock
- */
-/*
  * Written by Doug Lea with assistance from members of JCP JSR-166
- * Expert Group and released to the public domain. Use, modify, and
- * redistribute this code in any way without acknowledgement.
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-import java.util.concurrent.*;
-import java.util.concurrent.locks.*;
-import java.util.concurrent.atomic.*;
-import java.util.*;
+import java.util.concurrent.Callable;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicInteger;
 
 public final class NoopSpinLockLoops {
     static final ExecutorService pool = Executors.newCachedThreadPool();
@@ -21,23 +18,22 @@ public final class NoopSpinLockLoops {
 
     public static void main(String[] args) throws Exception {
         int maxThreads = 100;
-        if (args.length > 0) 
+        if (args.length > 0)
             maxThreads = Integer.parseInt(args[0]);
 
         new ReentrantLockLoop(1).test();
         new ReentrantLockLoop(1).test();
         print = true;
 
-        int k = 1;
-        for (int i = 1; i <= maxThreads;) {
+        for (int k = 1, i = 1; i <= maxThreads;) {
             System.out.print("Threads: " + i);
             new ReentrantLockLoop(i).test();
             Thread.sleep(100);
             if (i == k) {
                 k = i << 1;
                 i = i + (i >>> 1);
-            } 
-            else 
+            }
+            else
                 i = k;
         }
         pool.shutdown();
@@ -57,15 +53,15 @@ public final class NoopSpinLockLoops {
         }
 
         final void test() throws Exception {
-            for (int i = 0; i < nthreads; ++i) 
+            for (int i = 0; i < nthreads; ++i)
                 pool.execute(this);
             barrier.await();
             barrier.await();
             if (print) {
                 long time = timer.getTime();
-                long tpi = time / ((long)iters * nthreads);
+                long tpi = time / ((long) iters * nthreads);
                 System.out.print("\t" + LoopHelpers.rightJustify(tpi) + " ns per lock");
-                double secs = (double)(time) / 1000000000.0;
+                double secs = (double) time / 1000000000.0;
                 System.out.println("\t " + secs + "s run time");
             }
 
@@ -77,12 +73,12 @@ public final class NoopSpinLockLoops {
         public final void run() {
             final AtomicInteger lock = this.spinlock;
             try {
-                barrier.await(); 
+                barrier.await();
                 int sum = v + 1;
                 int x = sum + 1;
                 int n = iters;
                 while (n-- > 0) {
-                    while (!lock.compareAndSet(0, 1)) ;
+                    do {} while (!lock.compareAndSet(0, 1));
                     x = LoopHelpers.compute4(x);
                     lock.set(0);
                     if ((x += readBarrier) == 0)
@@ -93,11 +89,10 @@ public final class NoopSpinLockLoops {
                 barrier.await();
                 result += sum;
             }
-            catch (Exception ie) { 
-                return; 
+            catch (Exception ie) {
+                return;
             }
         }
     }
 
 }
-