Revision history for Perl extension threads.
+1.57 Wed Dec 20 13:10:26 EST 2006
+ - Fixes courtesy of Michael J. Pomraning
+ Eliminates self joins.
+ Eliminates multiple, simultaneous joins on a thread.
+ Protects thread->state variable with mutexes.
+ Checks that OS join call is successful.
+
+1.56 Fri Dec 15 12:18:47 EST 2006
+ - More fixes to test suite
+
+1.55 Fri Dec 15 11:24:46 EST 2006
+ - Fixes to test suite
+
1.54 Thu Dec 14 14:12:30 EST 2006
- Added ->error() method