* thread_win32.h (rb_thread_cond_struct): add prev field instead of last.
  (ie cond_event_entry is now using double linked list instead of single)
* thread_win32.c (cond_event_entry): add prev field.

* thread_win32.c (__cond_timedwait): remove entry properly if timeout
  was happen.

* thread_win32.c (native_cond_signal): change for double linked list.
* thread_win32.c (native_cond_broadcast): ditto.
* thread_win32.c (native_cond_initialize): ditto.




git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31459 b2dd03c8-39d4-4d8f-98ff-823fe69b080e