Add wakeup on subbuffer delivery

[lttng-ust.git] / libringbuffer / shm.h

diff --git a/libringbuffer/shm.h b/libringbuffer/shm.h
index d370375b6929cf913ed568e3e665ead996f515ec..008c5c415f3d8d9c383fdcaa3620cb36a06bc46d 100644 (file)
--- a/libringbuffer/shm.h
+++ b/libringbuffer/shm.h
@@ -68,4 +68,33 @@ struct shm_object *shm_object_table_append(struct shm_object_table *table,
 struct shm_ref zalloc_shm(struct shm_object *obj, size_t len);
 void align_shm(struct shm_object *obj, size_t align);
 
+static inline
+int shm_get_wakeup_fd(struct shm_handle *handle, struct shm_ref *ref)
+{
+       struct shm_object_table *table = handle->table;
+       struct shm_object *obj;
+       size_t index;
+
+       index = (size_t) ref->index;
+       if (unlikely(index >= table->allocated_len))
+               return -EPERM;
+       obj = &table->objects[index];
+       return obj->wait_fd[1];
+
+}
+
+static inline
+int shm_get_wait_fd(struct shm_handle *handle, struct shm_ref *ref)
+{
+       struct shm_object_table *table = handle->table;
+       struct shm_object *obj;
+       size_t index;
+
+       index = (size_t) ref->index;
+       if (unlikely(index >= table->allocated_len))
+               return -EPERM;
+       obj = &table->objects[index];
+       return obj->wait_fd[0];
+}
+
 #endif /* _LIBRINGBUFFER_SHM_H */