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/urtSubscriberFetchLatestMessage.svg b/doc/activitydiagrams/subscriber/urtSubscriberFetchLatestMessage.svg
index efdc536..07daaef 100644
--- a/doc/activitydiagrams/subscriber/urtSubscriberFetchLatestMessage.svg
+++ b/doc/activitydiagrams/subscriber/urtSubscriberFetchLatestMessage.svg
@@ -1,4 +1,4 @@
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stroke-width: 1.0;"/><path d="M877.5,72.8594 L877.5,82.8594 L887.5,82.8594 L877.5,72.8594 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="582.5" x2="611" y1="85.4258" y2="85.4258"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="0" x="615" y="89.4263"/><text fill="#000000" font-family="monospace" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="80" x="615" y="89.4263">subscriber</text><text fill="#000000" font-family="monospace" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="152" x="703" y="89.4263">: urt_subscriber_t*</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="0" x="859" y="89.4263"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="859" x2="887.5" y1="85.4258" y2="85.4258"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="284" x="588.5" y="105.0591">The subscriber that shall fetch the message.</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="76" x="588.5" y="120.1919">Must not be</text><text fill="#000000" font-family="monospace" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="32" x="668.5" y="120.1919">NULL</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="4" x="700.5" y="120.1919">.</text><line style="stroke: #A80036; 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stroke-width: 2.0;"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="104" x="424" y="940.4805">iterate to latest</text><path d="M575,967.2002 L575,992.333 A0,0 0 0 0 575,992.333 L785,992.333 A0,0 0 0 0 785,992.333 L785,985.2002 L805,979.7666 L785,977.2002 L785,977.2002 L775,967.2002 L575,967.2002 A0,0 0 0 0 575,967.2002 " fill="#FBFB77" filter="url(#f1gna4y7n2gv27)" style="stroke: #A80036; stroke-width: 1.0;"/><path d="M775,967.2002 L775,977.2002 L785,977.2002 L775,967.2002 " fill="#FBFB77" style="stroke: #A80036; stroke-width: 1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="189" x="581" y="984.2671">Locked two messages ahead.</text><rect fill="#FEFECE" filter="url(#f1gna4y7n2gv27)" height="33.9688" rx="12.5" ry="12.5" style="stroke: #A80036; stroke-width: 1.5;" width="225" x="805" y="962.7822"/><text fill="#000000" font-family="sans-serif" font-size="12" lengthAdjust="spacingAndGlyphs" textLength="205" x="815" y="983.9209">lock one message further ahead</text><rect fill="#000000" filter="url(#f1gna4y7n2gv27)" height="6" rx="2.5" ry="2.5" style="stroke: #000000; 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+<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentScriptType="application/ecmascript" contentStyleType="text/css" height="1712px" preserveAspectRatio="none" style="width:1846px;height:1712px;" version="1.1" viewBox="0 0 1846 1712" width="1846px" zoomAndPan="magnify"><defs><filter height="300%" id="f1n5j7g2wxnm1t" width="300%" x="-1" y="-1"><feGaussianBlur result="blurOut" stdDeviation="2.0"/><feColorMatrix in="blurOut" result="blurOut2" type="matrix" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .4 0"/><feOffset dx="4.0" dy="4.0" in="blurOut2" result="blurOut3"/><feBlend in="SourceGraphic" in2="blurOut3" mode="normal"/></filter></defs><g><text fill="#000000" font-family="sans-serif" font-size="18" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="89" x="877.5" y="26.708">µRtWare</text><text fill="#000000" font-family="sans-serif" font-size="18" lengthAdjust="spacingAndGlyphs" textLength="309" x="767.5" y="47.6611">urtSubscriberFetchLatestMessage()</text><text fill="#000000" font-family="sans-serif" font-size="18" lengthAdjust="spacingAndGlyphs" textLength="0" x="925" y="68.6143"/><path d="M582.5,72.8594 L582.5,249.3203 A0,0 0 0 0 582.5,249.3203 L887.5,249.3203 A0,0 0 0 0 887.5,249.3203 L887.5,165.0898 L907.5,161.0898 L887.5,157.0898 L887.5,82.8594 L877.5,72.8594 L582.5,72.8594 A0,0 0 0 0 582.5,72.8594 " fill="#FBFB77" filter="url(#f1n5j7g2wxnm1t)" style="stroke: #A80036; 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 @startuml
 
 title **µRtWare**\nurtSubscriberFetchLatestMessage()\n
@@ -32,50 +32,35 @@ end note
 
 :lock topic;
 if (Is HRT subscriber?) then (yes)
-  :lock next message;
+  :access next message;
 else (no)
   if (Has a message been read before?) then (yes)
-    :lock last read message;
+    :access last read message;
     if (Message timestamp equals local copy?) then (yes)
     else (no)
       partition "find oldest valid message" {
-        :lock next message;
-        note: Locked two messages ahead.
+        :access next message;
         while (Timestamp of next is younger than of current?) is (yes)
-          fork
-            :unlock current message;
-          fork again
-            :lock one message further ahead;
-          endfork
+          :iterate by one message;
         endwhile (no)
-        :unlock next message;
-        note: One message still locked.
       }
     endif
   else (no)
-    :lock message after topic's latest message;
+    :access message after topic's latest message;
   endif
 endif
 partition "iterate to latest" {
-  :lock one message further ahead;
-  note: Locked two messages ahead.
   while (Timestamp of next message is younger than of current?) is (yes)
-    fork
-      if (Is HRT subscriber?) then (yes)
-        fork
-          :decrement HRT counter of current message;
-        fork again
-          :update QoS delay timer (@subscriber);
-        endfork
-      else (no)
-      endif
-      :unlock current message;
-    fork again
-      :lock one message further ahead;
-    endfork
+    if (Is HRT subscriber?) then (yes)
+      fork
+        :decrement HRT counter of current message;
+      fork again
+        :update QoS delay timer (@subscriber);
+      endfork
+    else (no)
+    endif
+    :iterate by one message;
   endwhile (no)
-  :unlock next message;
-  note: One message still locked.
 }
 fork
   :set last fetched message pointer to locked message;
@@ -104,7 +89,6 @@ fork again
   else (no)
   endif
 endfork
-:unlock message;
 :unlock topic;
 
 
