prevent race condition

Author: mapogolions

Diff for: transport/http_client.go

@@ -115,22 +115,22 @@ func (h *httpTransportClient) Recv(msg *Message) (err error) {
 		var rc *http.Request
 		var ok bool
 
+		h.Lock()
 		select {
 		case rc, ok = <-h.req:
 		default:
 		}
 
 		if !ok {
-			h.Lock()
 			if len(h.reqList) == 0 {
 				h.Unlock()
 				return io.EOF
 			}
 
 			rc = h.reqList[0]
 			h.reqList = h.reqList[1:]
-			h.Unlock()
 		}
+		h.Unlock()
 
 		req = rc
 	}