Tests on powerpc-unknown-linux-gnu

[Andrew Haley]

Andrew Haley writes:
 > Bryce McKinlay writes:
 >  > Mark Wielaard wrote:
 >  > 
 >  > >=== libjava Summary ===
 >  > >
 >  > ># of expected passes            2039
 >  > ># of unexpected failures        2
 >  > ># of expected failures          18
 >  > ># of untested testcases         14
 >  > >
 >  > >The two failures are from Thread_Interrupt which seems to just Abort.
 >  > >
 >  > 
 >  > Odd. Thread_Interrupt works for me.
 > 
 > I get the same Thread_Interrupt failures.  I'll have a look.

Got it: we don't wait for long enough on a fast machine for the
interrupting thread to start.

This patch fixes the problem.

Andrew.



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

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

Index: Thread_Interrupt.java
===================================================================
RCS file: /cvs/gcc/gcc/libjava/testsuite/libjava.lang/Thread_Interrupt.java,v
retrieving revision 1.1
diff -u -r1.1 Thread_Interrupt.java
--- Thread_Interrupt.java	2000/03/23 12:35:44	1.1
+++ Thread_Interrupt.java	2002/03/21 13:19:47
@@ -44,12 +44,33 @@
 
 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;