+ /**
+ * Mark the underlying buffers in this chain as shared with external memory
+ * management mechanism. This will make isShared() always returns true.
+ *
+ * This function is not thread-safe, and only safe to call immediately after
+ * creating an IOBuf, before it has been shared with other threads.
+ */
+ void markExternallyShared();
+
+ /**
+ * Mark the underlying buffer that this IOBuf refers to as shared with
+ * external memory management mechanism. This will make isSharedOne() always
+ * returns true.
+ *
+ * This function is not thread-safe, and only safe to call immediately after
+ * creating an IOBuf, before it has been shared with other threads.
+ */
+ void markExternallySharedOne() {
+ SharedInfo* info = sharedInfo();
+ if (info) {
+ info->externallyShared = true;
+ }
+ }
+