- allow scriptcontext objects to be dynamic

- enhancements in scriptcontext (error messages stored as properties)

devser.h

@@ -10,10 +10,12 @@ typedef struct DevSer DevSer;
 /** \brief The action handler to be called
  * \param actionData the data stored with the action
  * \param lastReply the last reply or NULL when no command was
- *    sent in the last action
+ *    sent in the last action, or the error message (when commError == 1)
+ * \param commError 0: ok, 1: there was a communication error 
  * \return the command to be sent or NULL if no command has to be sent
  */
-typedef char *DevActionHandler(void *actionData, char *lastReply);
+typedef char *DevActionHandler(void *actionData, char *lastReply,
+                               int commError);
 
 /** \brief Check if an action matches the call data
  * \param callData the callers data
@@ -29,10 +31,12 @@ typedef void DevKillActionData(void *actionData);
 
 /** \brief possible priorities.
  * NullPRIO and NumberOfPRIO must not be used as priority
+ * if an action with StartPRIO is scheduled, all other activities
+ * are blocked until the action is unscheduled
  */
 typedef enum {
   NullPRIO, SlowPRIO, ReadPRIO, ProgressPRIO, WritePRIO, HaltPRIO,
-      NumberOfPRIO
+      StartPRIO, NumberOfPRIO
 } DevPrio;
 
 /** \brief Make a new device serializer and async connection.
@@ -100,7 +104,7 @@ int DevSchedule(DevSer * devser, void *actionData,
 
 /** \brief Unschedule matching actions
  * \param devser the device serializer
- * \param callData the callers data to be as first argument of the match function
+ * \param actionData the callers data to be used as first argument of the match function
  * \param hdl the action handler
  * \param matchFunc the match function (callData does not need to have the same type as actionData)
  * \return the number of unscheduled actions 
@@ -114,6 +118,7 @@ int DevUnschedule(DevSer * devser, void *actionData,
  */
 int DevRemoveAction(DevSer * devser, void *actionData);
 
+
 /** \brief Convert integer priority to text
  * \param prio
  * \return text
@@ -126,5 +131,4 @@ char *DevPrio2Text(DevPrio prio);
  */
 DevPrio DevText2Prio(char *text);
 
-
 #endif