update extern C for cplusplus

cdgwoon · cdgwoon · commit dd175905b850 · 2018-09-10T12:11:56.000+08:00
diff --git a/lfqueue.h b/lfqueue.h
@@ -64,5 +64,10 @@ extern void lfqueue_destroy(lfqueue_t *lfqueue);
 extern size_t lfqueue_size(lfqueue_t *lfqueue);
 extern void lfqueue_sleep(unsigned int milisec);
 
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif
 
