X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fhmap.h;h=445e74f0b798266e629a0a7f611d6a0d9a62beb6;hb=7614e5d01c3b971c57d825111e412b1182cc04c8;hp=76a73ac1ad23852e01acc003fb07e24820016264;hpb=fc24d64d27b745593fe9d5a6c73dfc6dd9da5983;p=sliver-openvswitch.git

diff --git a/lib/hmap.h b/lib/hmap.h
index 76a73ac1a..445e74f0b 100644
--- a/lib/hmap.h
+++ b/lib/hmap.h
@@ -19,6 +19,7 @@
 
 #include <stdbool.h>
 #include <stdlib.h>
+#include "ovs-atomic.h"
 #include "util.h"
 
 #ifdef  __cplusplus
@@ -189,10 +190,13 @@ hmap_capacity(const struct hmap *hmap)
 }
 
 /* Returns true if 'hmap' currently contains no nodes,
- * false otherwise. */
+ * false otherwise.
+ * Note: While hmap in general is not thread-safe without additional locking,
+ * hmap_is_empty() is. */
 static inline bool
 hmap_is_empty(const struct hmap *hmap)
 {
+    atomic_thread_fence(memory_order_acquire);
     return hmap->n == 0;
 }