2010-09-30 Ivan Maidanski <ivmai@mail.ru>

2010-09-30  Ivan Maidanski <ivmai@mail.ru>

	* darwin_stop_world.c (GC_query_task_threads): New variable (or
	macro).
	* darwin_stop_world.c (GC_push_all_stacks): Use
	GC_query_task_threads (to choose between algorithms based on
	kernel task_threads and based on GC_threads table); update FIXME;
	remove commented out GC_push_one statements.
	* pthread_support.c (GC_thr_init, GC_do_blocking_inner,
	GC_call_with_gc_active, GC_register_my_thread_inner): Initialize
	stack_ptr field for all platforms.
	* pthread_support.c (GC_call_with_gc_active): Initialize
	saved_stack_ptr field for all platforms.
	* include/private/darwin_stop_world.h (thread_stop_info): Add
	stack_ptr field; change type of already_suspended from int to
	GC_bool.