* thread.c, thread_pthread.c, thread_win32.c: merges nobu's commits -

  r20117, r20123, r20124, r20127, r20132-r20134, r20138, r20140, r20141
  and r20160 - from trunk into ruby_1_9_1.

* thread_pthread.c (thread_timer): checks working flags again.

* thread_pthread.c (rb_thread_create_timer_thread): do not wait never
  coming signal if failed to create tiemr thread.

* thread_pthread.c (native_cond_timedwait): returns error code.

* thread_pthread.c (thread_timer, rb_thread_create_timer_thread):
  handshakes properly.

* thread_pthread.c (thread_timer): initializes mutex each time.

* thread_win32.c (thread_start_func_1): use already gotten stack info.

* thread.c (thread_timer): pthread_cond_timedwait returns ETIMEDOUT
  when timed out.

* thread_pthread.c (thread_timer): uses pthread_cond_timedwait always
  instead of pthread_kill.

* thread.c (thread_timer): uses timedwait on cygwin.

* thread.c (rb_thread_stop_timer_thread): terminates timer thread
  immediately.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@20407 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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