RTDM abstraction for priority direction

Hi,

it turned out that it is useful to abstract the priority increment/decrement by one level at the RTDM layer - for systems that use a different scheme compared to POSIX or Xenomai (so far only classic RTAI). Please apply.

Jan

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Index: skins/rtdm/rtdm_driver.h
===================================================================

rtdm/rtdm_driver.h +8 -1

@@ -831,8 +831,16 @@
 #define RTDM_TASK_HIGHEST_PRIORITY  XNCORE_HIGH_PRIO
 /** @} */
 
+/*!
+ * @anchor changetaskprio @name Task Priority Modification
+ * Raise or lower task priorities by one level
+ * @{ */
+#define RTDM_TASK_RAISE_PRIORITY    (+1)
+#define RTDM_TASK_LOWER_PRIORITY    (-1)
 /** @} */
 
+/** @} */
+
 static inline int rtdm_task_init(rtdm_task_t *task, const char *name,
                                  rtdm_task_proc_t task_proc, void *arg,
                                  int priority, __u64 period)
 
 
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