[Gc] Patch resubmission: GC_do_blocking for Win32 and anti-GC_do_blocking - part 1/2

Ivan Maidanski ivmai at mail.ru
Fri Sep 11 13:37:53 PDT 2009


This suggested patch (ivmai130a.diff, ivmai130b.diff), superseding diff44 [Nov 13] and diff69a/b [Apr 14], does:
- add API declaration for GC_do_blocking() (which is implemented for pthreads at present);
- implement GC_do_blocking() for Win32;
- introduce new API function GC_call_with_gc_active() which does the opposite to GC_do_blocking();
- exclude the stack regions between each nested GC_do_blocking() and GC_call_with_gc_active() calls from scanning;
- implement GC_do_blocking() and GC_call_with_gc_active() for th single-threaded case (for the reason just above and/or for more precise stack base recording).

For more info (and rationale), see: http://permalink.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/2612

Note: thie patch should be tested on IA-64.

ChangeLog entries:

	* include/gc.h (GC_do_blocking, GC_call_with_gc_active): New
	function prototype.
	* include/private/gc_priv.h (STOP_WORLD): Replace a no-op (for the
	single-threaded case) with an assertion check for the state to be
	not a "do-blocking" one.
	* include/private/gc_priv.h (blocking_data): Move the structure
	definition from pthread_support.c; change "fn" return type to void
	* include/private/gc_priv.h (GC_activation_frame_s): New structure
	* include/private/gc_priv.h (GC_push_all_stack_frames): New
	function declaration (only if THREADS).
	* include/private/gc_priv.h (GC_world_stopped): Don't declare
	unless THREADS.
	* include/private/gc_priv.h (GC_blocked_sp,
	GC_activation_frame_s): New declaration (only if not THREADS).
	* include/private/gc_priv.h (GC_push_all_register_frames): New
	function declaration (only for IA-64).
	* include/private/gc_priv.h (NURSERY, GC_push_proc): Remove
	obsolete (unused) symbols.
	* include/private/gc_priv.h (GC_push_all_stack_partially_eager):
	Remove declaration (since it is static now).
	* mark_rts.c (GC_push_all_stack_partially_eager): Move from mark.c
	(for code locality) and make STATIC.
	* mark_rts.c (GC_push_all_register_frames): New function (only for
	* mark_rts.c (GC_push_all_stack_frames): New function (only if
	* mark_rts.c (GC_add_trace_entry): New function prototype (used by
	GC_push_all_stack_partially_eager(), only if TRACE_BUF).
	* mark_rts.c (GC_push_all_stack_part_eager_frames): New function.
	* mar_rts.c (GC_save_regs_ret_val): Move the declaration out of a
	function body (only for IA-64).
	* mark_rts.c (GC_push_current_stack): Call
	GC_push_all_stack_part_eager_frames() instead of
	* mark_rts.c (GC_push_current_stack): Call
	GC_push_all_register_frames() instead of GC_push_all_eager() for
	IA-64 backing store.
	* misc.c (GC_do_blocking_inner): Declare function (if THREADS
	* misc.c (GC_blocked_sp, GC_blocked_register_sp,
	GC_activation_frame): New global variables (only if not THREADS).
	* misc.c (GC_call_with_gc_active, GC_do_blocking_inner): New API
	function (only if not THREADS).
	* misc.c (GC_do_blocking): Move the function from
	* include/private/pthread_support.h (GC_Thread_Rep): Add
	"activation_frame" field.
	* pthread_stop_world.c (GC_push_all_stacks): Call
	GC_push_all_stack_frames() and GC_push_all_register_frames instead
	of GC_push_all_stack() and/or GC_push_all_eager(); don't check for
	* pthread_support.c (GC_do_blocking_inner): Remove "static"; store
	"fn" result back to "client_data" field.
	* pthread_support.c (GC_call_with_gc_active): New API function.
	* win32_threads.c (GC_call_with_gc_active): Ditto.
	* win32_threads.c (GC_Thread_Rep): Add "thread_blocked_sp" and
	"activation_frame" fields.
	* win32_threads.c (GC_new_thread): Add assertion checking for
	thread_blocked_sp is NULL.
	* win32_threads.c (GC_do_blocking_inner): New function.
	* win32_threads.c (GC_stop_world): Don't suspend a thread if its
	thread_blocked_sp is non-NULL.
	* win32_threads.c (GC_push_stack_for): Use thread
	"activation_frame" (if non-NULL); use "thread_blocked_sp" if
	non-NULL (instead of calling GetThreadContext()); "UNPROTECT" the
	thread before modifying its last_stack_min; call
	GC_push_all_stack_frames() instead of GC_push_all_stack(); update
	the comments.

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