add mutex header

jacquesqiao · jacquesqiao · commit fa2079b71a30 · 2018-05-30T09:45:39.000+08:00
diff --git a/paddle/fluid/framework/selected_rows.h b/paddle/fluid/framework/selected_rows.h
@@ -16,6 +16,7 @@ limitations under the License. */
 
 #include <algorithm>
 #include <memory>
+#include <mutex>  // NOLINT
 #include <utility>
 #include <vector>
 
