2009-08-01 Hans Boehm <Hans.Boehm@hp.com> (Really Ivan Maidanski)

2009-08-01  Hans Boehm <Hans.Boehm@hp.com> (Really Ivan Maidanski)
	diff100_cvs (diff51 and diff55, partly)

	* pthread_support.c (GC_allow_register_threads): New API function.
        * win32_threads.c (GC_allow_register_threads): Ditto.
        * include/gc.h (GC_allow_register_threads): New API prototype.
        * include/gc.h (GC_register_my_thread, GC_unregister_my_thread):
        Update the comments.
        * pthread_support.c (GC_register_my_thread): Check the collector
        is in the multi-threaded mode.
        * win32_threads.c (GC_register_my_thread): Ditto.