commit c22d21adf8eb95fd23d41cc425b97ccb69d2232a
Author: Thomas Schöpping <tschoepp@cit-ec.uni-bielefeld.de>
Date:   Fri Feb 21 17:07:24 2020 +0100

    documentation: removed mutex lock from message structure (was redundantly used with topic lock)

diff --git a/doc/activitydiagrams/subscriber/urtSubscriberSubscribeSrt.svg b/doc/activitydiagrams/subscriber/urtSubscriberSubscribeSrt.svg
index 39d96f3..eb412dd 100644
--- a/doc/activitydiagrams/subscriber/urtSubscriberSubscribeSrt.svg
+++ b/doc/activitydiagrams/subscriber/urtSubscriberSubscribeSrt.svg
@@ -1,4 +1,4 @@
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 @startuml
 
 title **µRtWare**\nurtSubscriberSrt()\n
@@ -43,21 +43,23 @@ else (no)
   fork again
     :set topic;
   endfork
-  :lock topic;
   fork
-    if (Messages to contribute?) then (yes)
-      partition "contribute messages" {
-        :set next pointer of topic's latest message to first message to contribute;
-        :set next pointer of last message to contribute to the message after the topic's latest message;
-      }
-    else (no)
-    endif
-  fork again
-    :set message pointer to topic's latest message;
+    :lock topic;
+    fork
+      if (Messages to contribute?) then (yes)
+        partition "contribute messages" {
+          :set next pointer of topic's latest message to first message to contribute;
+          :set next pointer of last message to contribute to the message after the topic's latest message;
+        }
+      else (no)
+      endif
+    fork again
+      :set message pointer to topic's latest message;
+    endfork
+    :unlock topic;
   fork again
     :register to topic's event source;
   endfork
-  :unlock topic;
   :return ""URT_STATUS_OK"";
 endif
 
