Export GC_apply_to_all_blocks() as public API

Issue #460 (bdwgc).

* headers.c (GC_apply_to_all_blocks): Add GC_API and GC_CALL modifiers;
use GC_walk_hblk_fn; use GC_word instead of word; declare fn using
GC_walk_hblk_fn; move comment to gc_mark.h.
* include/gc/gc_mark.h (struct GC_hblk_s, GC_walk_hblk_fn): Declare.
* include/gc/gc_mark.h (GC_apply_to_all_blocks): Move declaration from
include/private/gc_priv.h.
* include/private/gcconfig.h [GC_PRIVATE_H] (hblk): Define as macro (to
GC_hblk_s).

1 files changed, 2 insertions, 5 deletions

diff --git a/headers.c b/headers.c
index 990ae7b0..b40fdfb8 100644
--- a/headers.c
+++ b/headers.c
@@ -329,11 +329,8 @@ GC_INNER void GC_remove_counts(struct hblk *h, size_t sz/* bytes */)
     }
 }
 
-/* Apply fn to all allocated blocks.  It is the caller responsibility   */
-/* to avoid data race during the function execution (e.g. by holding    */
-/* the allocation lock).                                                */
-void GC_apply_to_all_blocks(void (*fn)(struct hblk *h, word client_data),
-                            word client_data)
+GC_API void GC_CALL GC_apply_to_all_blocks(GC_walk_hblk_fn fn,
+                                           GC_word client_data)
 {
     signed_word j;
     bottom_index * index_p;