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Thread_Interrupt.java (Looper.calibrate): New.

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2002-03-21  Andrew Haley  <aph@redhat.com>

	* libjava.lang/Thread_Interrupt.java (Looper.calibrate): New.
	(yields): New.

From-SVN: r51169
This commit is contained in:
Andrew Haley 2002-03-22 11:18:03 +00:00 committed by Andrew Haley
parent 0a2ed1f101
commit f42f14a9ca
2 changed files with 27 additions and 1 deletions
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5
libjava/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2002-03-21 Andrew Haley <aph@redhat.com>
* libjava.lang/Thread_Interrupt.java (Looper.calibrate): New.
(yields): New.
2002-03-18 Tom Tromey <tromey@redhat.com>
* libjava.jni/jni.exp (gcj_jni_test_one): Find libstdc++ in build

23
libjava/testsuite/libjava.lang/Thread_Interrupt.java
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@ -44,12 +44,33 @@ class Sleeper extends Thread
class Looper extends Thread
{
// Return the number of Thread.yield()s we can do in 500ms.
static long calibrate ()
{
long i = 1;
for (int tries = 0; tries < 40; tries++)
{
long t = System.currentTimeMillis();
for (long n = 0; n < i; n++)
Thread.yield();
long t_prime = System.currentTimeMillis();
if (t_prime - t > 500)
return i;
i *= 2;
}
// We have no system clock. Give up.
throw new RuntimeException ("We have no system clock.");
}
static long yields = calibrate ();
public void run()
{
System.out.println ("Busy waiting");
int count = 0;
for (int i=0; i < 1000000; i++)
for (long i=0; i < yields; i++)
{
Thread.yield();
count += 5;