1 files changed, 3 insertions, 3 deletions
diff --git a/headers.c b/headers.c
index 4236ceca..d2c283c5 100644
--- a/headers.c
+++ b/headers.c
@@ -313,15 +313,15 @@ GC_INNER void GC_remove_counts(struct hblk *h, size_t sz/* bytes */)
     }
 }
 
-/* Apply fn to all allocated blocks */
-/*VARARGS1*/
+/* 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)
 {
     signed_word j;
     bottom_index * index_p;
 
-    GC_ASSERT(I_HOLD_LOCK());
     for (index_p = GC_all_bottom_indices; index_p != 0;
          index_p = index_p -> asc_link) {
         for (j = BOTTOM_SZ-1; j >= 0;) {