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-rw-r--r--erts/emulator/beam/index.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/erts/emulator/beam/index.h b/erts/emulator/beam/index.h
index b2e3c0eab5..10f5d1eb39 100644
--- a/erts/emulator/beam/index.h
+++ b/erts/emulator/beam/index.h
@@ -65,6 +65,7 @@ void index_erase_latest_from(IndexTable*, Uint ix);
ERTS_GLB_INLINE int index_put(IndexTable*, void*);
ERTS_GLB_INLINE IndexSlot* erts_index_lookup(IndexTable*, Uint);
+ERTS_GLB_INLINE int erts_index_num_entries(IndexTable* t);
#if ERTS_GLB_INLINE_INCL_FUNC_DEF
@@ -78,6 +79,19 @@ erts_index_lookup(IndexTable* t, Uint ix)
{
return t->seg_table[ix>>INDEX_PAGE_SHIFT][ix&INDEX_PAGE_MASK];
}
+
+ERTS_GLB_INLINE int erts_index_num_entries(IndexTable* t)
+{
+ int ret = t->entries;
+ /*
+ * Do a read barrier here to allow lock free iteration
+ * on tables where entries are never erased.
+ * index_put_entry() does matching write barrier.
+ */
+ ERTS_SMP_READ_MEMORY_BARRIER;
+ return ret;
+}
+
#endif
#endif