added curl_easy_duphandle

include/curl/easy.h

@@ -46,6 +46,21 @@ void curl_easy_cleanup(CURL *curl);
  */
 CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ...);
 
+
+/*
+ * NAME curl_easy_duphandle()
+ *
+ * DESCRIPTION
+ *
+ * Creates a new curl session handle with the same options set for the handle
+ * passed in. Duplicating a handle could only be a matter of cloning data and
+ * options, internal state info and things like persistant connections cannot
+ * be transfered. It is useful in multithreaded applications when you can run
+ * curl_easy_duphandle() for each new thread to avoid a series of identical
+ * curl_easy_setopt() invokes in every thread.
+ */
+CURL* curl_easy_duphandle(CURL *curl);
+
 #ifdef  __cplusplus
 }
 #endif