Revision history for Perl extension threads.
1.82 Fri Dec 24 16:21:56 2010
        - Document issue with open dir handles
        - Sync from blead
        - POD update
1.81 Mon Sep 27 17:36:31 2010
        - Make compatible with Perl 5.13.2 and higher
1.79 Fri Sep 24 18:40:59 2010
        - Fix failing tests in t/kill2.t
1.78 Wed Sep 22 17:21:22 2010
        - Handle missing signal handler in thread (threads bug #60460)
1.77 Fri Mar 26 13:36:33 2010
        - Fix race condition in t/threads.t (threads bug #55633)
1.76 Tue Mar  9 14:02:43 EST 2010
        - Handle magic on arg to ->object() (bug #73330)
        - Make ->object(threads->tid()) work like ->self() (bug #73330)
        - Noted memory consumption issue in POD
        - Added reusable thread pool example
1.75 Mon Nov 23 15:32:28 2009
        - Conditionally compile tmps stack cleanup code (bug #70411)
        - Support mingw64
        - Install in 'site' for Perl >= 5.011
1.74 Mon Aug 10 18:53:59 2009
        - Updated DESCRIPTION in POD
        - Added 'no_threads' test
        - Upgraded ppport.h to Devel::PPPort 3.19
1.73 Mon Jun  8 13:17:04 2009
        - Signal handling during thread creation/destruction (John Wright)
        - Upgraded ppport.h to Devel::PPPort 3.17
1.72 Wed Feb 25 20:23:25 2009
        - Correct flags to perl_get_sv() in threads.xs
        - Use watchdog() in 'free' tests
        - Simplified loading modules in tests
        - Upgraded ppport.h to Devel::PPPort 3.16
1.71 Tue Jun 10 17:07:25 2008
        - Upgraded ppport.h to Devel::PPPort 3.14
        - Discourage the use of END blocks in threads
        - LICENSE section in POD
        - 'die' properly if no compiler
        - End all tests with exit(0)
1.69 Fri Feb 22 21:22:22 2008
        - Allow installation on non-threaded Perls
1.68 Wed Feb 20 17:05:21 2008
        - Blead change 33024
        - Upgraded ppport.h to Devel::PPPort 3.13_01
1.67 Tue Sep 18 20:44:40 2007
        - Test fix for Perl < 5.8.7
1.66 Fri Sep 14 18:54:20 2007
        - [perl #45053] Memory corruption with heavy module loading in threads
        - Upgraded ppport.h to Devel::PPPort 3.11_06
1.65 Wed Sep  5 13:19:09 2007
        - Skip spelling test (maintainer only)
1.64 Sun Aug 19 13:59:16 EDT 2007
        - Documented cwd and %ENV issues wrt threads
        - Sundry test suite fixes
        - POD spelling test
1.63 Tue Jun 26 21:15:27 EDT 2007
        - Avoid double-free of the thread function
        - Added reference in POD to perlmod section on thread safety
        - Mention leaked and unreferenced scalar warnings in POD
        - Removed BEGIN in threads.pm
        - Only need to require Config
1.62 Thu May 17 16:10:49 2007
        - Fixed :all import option
        - Fixed problems in test suite
        - Subversion repository on Google
1.61 Wed Mar 21 16:09:15 EDT 2007
        - Fix 'list/array' context - both keywords are supported
        - Upgraded ppport.h to Devel::PPPort 3.11
        - Removed embed.t - unreliable
1.59 Mon Feb  5 16:05:44 EST 2007
        - POD tweaks per Wolfgang Laun
1.58 Wed Jan 24 13:15:34 EST 2007
        - Fix race conditions on thread destruction (Dave Mitchell)
        - Ignore thread return value(s) in void context
        - Check for missing args for 'use threads' options
        - Check that stack size argument is numeric
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
1.53 Mon Nov 27 12:08:27 EST 2006
        - Fix for a thread cloning bug
        - Fixes to test suite
1.52 Tue Nov 21 11:04:03 EST 2006
        - Fix compiler warnings
1.51 Wed Nov 15 14:25:30 EST 2006
        - Thread destruction fix
1.49 Fri Nov  3 08:33:28 EST 2006
        - Fix a warning message
1.48 Thu Nov  2 12:33:22 EST 2006
        - Fix for segfault during thread destruction
1.47 Mon Oct 30 16:02:53 EST 2006
        - Fix t/thread.t crash under Win32
        - Test multiple embedded Perl support
1.46 Fri Oct 27 19:51:48 EST 2006
        - Support multiple embedded Perls
        - Document workaround for non-threadsafe modules
1.45 Wed Oct 25 14:22:23 EDT 2006
        - Makefile.PL changes for CORE
        - Updated POD tests
1.44 Wed Oct 11 08:55:50 EDT 2006
        - Complain about bad import options
        - Added example threads script
1.43 Fri Oct  6 15:12:07 EDT 2006
        - Stringify threads objects
        - Removed 'typemap' file
1.42 Mon Sep 18 11:17:13 EDT 2006
        - Fixes to tests
        - Move $threads::threads outside of BEGIN block
1.41 Fri Sep  8 19:28:41 EST 2006
        - Race condition fixes
1.39 Tue Aug 30 12:00:00 EDT 2006
        - Signals are safe in 5.8.0
        - Upgraded ppport.h to Devel::PPPort 3.10
1.38 Tue Aug  1 11:48:56 EDT 2006
        - Fixes to tests
1.37 Fri Jul 21 10:51:36 EDT 2006
        - Revert 'exit' behavior with override
1.36 Mon Jul 10 15:58:13 EDT 2006
        - Ignore signals sent to terminated threads
1.35 Mon Jul 10 09:44:47 EDT 2006
        - Upgraded ppport.h to Devel::PPPort 3.09
        - Fix for Borland compiler
1.34 Thu Jul  6 10:29:37 EDT 2006
        - Added ->is_running, ->is_detached, ->is_joinable, ->wantarray
        - Enhanced ->list to return running or joinable threads
1.33 Mon Jul  3 10:11:20 EDT 2006
        - 'exit' inside a thread silently terminates thread only
        - Added 'threads->exit()' (just calls CORE::exit(0))
        - Handle 'die/exit' in thread warn handlers if thread terminates
            with a warning
        - Give exact accounting of unjoined threads on program termination
        - Fix spurious 'failures' from t/blocks.t
        - Set correct path to threads module in tests that use test.pl
1.32 Mon Jun  5 09:27:53 EDT 2006
        - Fix for HP-UX 10.20 pthread_attr_getstacksize usage
        - Check for threads::shared in tests
1.31 Fri May 19 16:06:42 EDT 2006
        - Explicit thread context
1.29 Thu May 18 16:09:28 EDT 2006
        - Fix warning/core dump from ->create('foo') in BEGIN block
1.28 Wed May 17 14:33:13 EDT 2006
        - Fix for build failure under older Perl versions
        - Skip signalling tests if using unsafe signals
1.27 Thu May 11 11:52:21 EDT 2006
        - Added $thr->kill() method for thread signalling
        - Check for 'C' compiler when building module
1.26 Mon May  8 13:18:29 EDT 2006
        - Fix for Win32 build WRT page size
1.25 Thu May  4 12:34:02 EDT 2006
        - Final sync with blead
        - Lock counters in tests
1.24 Mon Apr 24 10:29:11 EDT 2006
        - assert() that thread 0 is never destructed
        - Determinancy in free.t
1.23 Thu Apr 13 16:57:00 EDT 2006
        - BUG (RE)FIX: Properly free thread's Perl interpreter
        - It's an error to detach a thread twice
        - More XS code cleanups
1.22 Fri Apr  7 21:35:06 EDT 2006
        - Documented maximum stack size error
1.21 Tue Apr  4 13:57:23 EDT 2006
        - Corrected ->_handle() to return a pointer
        - Overload !=
1.19 Sat Mar 25 18:46:02 EST 2006
        - Use 'DEFINE' instead of 'CCFLAGS' in Makefile.PL
1.18 Fri Mar 24 14:21:36 EST 2006
        - ->equal returns 0 on false for backwards compatibility
        - Changed UVs to IVs in XS code (except for TID)
        - Use ->create in tests
1.17 Thu Mar 23 10:31:20 EST 2006
        - Restoration of 'core' build parameters
1.15 Wed Mar 22 13:46:51 EST 2006
        - BUG FIX: Replaced SvPV_nolen_const macro
        - Disabled closure return test again and added note in POD
1.14 Tue Mar 21 08:40:16 EST 2006
        - BUG FIX: Corrected UV formatting string
1.13 Mon Mar 20 15:09:42 EST 2006
        - BUG FIX: Round stack sizes to multiple of page size
        - Use PTHREAD_STACK_MIN if available
1.12 Sun Mar 19 17:34:49 EST 2006
        - Implemented $thr1->equal($thr2) in XS
        - Use $ENV{PERL_CORE} in tests
1.11 Fri Mar 17 13:24:35 EST 2006
        - BUG FIX: Properly free thread's Perl interpreter
        - Removed BUGS POD item regarding returning objects from threads
        - Enabled closure return test in t/problems.t
        - Handle deprecation of :unique in tests
        - XS code cleanup
        - Better POD coverage
1.09 Mon Mar 13 14:14:37 EST 2006
        - Initial (re-)release to CPAN
        - 64-bit TIDs
        - API for thread stack size (courtesy of Dean Arnold)
        - Made threads->list() context sensitive
        - Implemented threads->object($tid) in XS
        - Added $thr->_handle() method
Ancient history:
0.03  Mon Jul  2 12:00:50 CEST 2001
        Fixed bug with threads->self() in main thread, thanks Hackworth!
0.02  Sat Jun 30 09:41:00 GMT 2001
        Fixed bug in threads->self() reported by Hackworth
  
0.01  Tue Apr 24 19:04:12 2001
        Cleaned up documentation