1.3.7. Task management

Each task in the runtime system has a specified logical priority. This priority is separated into the following 8 task segments, each with 31 priorities to categorize tasks:

Usage	Defines	Priority
Task segment 1 For system tasks like scheduler	TASKPRIO_SYSTEM_BASE	0
	TASKPRIO_SYSTEM_END	31
Task segment 2 For real time tasks like IEC-tasks	TASKPRIO_REALTIME_BASE	32
	TASKPRIO_REALTIME_END	63
Task segment 3 High priority tasks like high prior communication tasks	TASKPRIO_HIGH_BASE	64
	TASKPRIO_HIGH_END	95
Task segment 4 Above normal tasks	TASKPRIO_ABOVENORMAL_BASE	96
	TASKPRIO_ABOVENORMAL_END	127
Task segment 5 Normal priority tasks like standard communication task	TASKPRIO_NORMAL_BASE	128
	TASKPRIO_NORMAL_END	159
Task segment 6 Below normal tasks	TASKPRIO_BELOWNORMAL_BASE	160
	TASKPRIO_BELOWNORMAL_END	191
Task segment 7 Low task priorities.	TASKPRIO_LOW_BASE	192
	TASKPRIO_LOW_END	223
Task segment 8 Lowest task priorities for background tasks.	TASKPRIO_LOWEST_BASE	224
	TASKPRIO_LOWEST_END TASKPRIO_IDLE TASKPRIO_MIN	255

So each task priority should be assigned to one of these 8 task segments.

A task can be specified with a special m4-Macro in its component Dep.m4 file. These macros are described in 11. If you specify your task with this macro, the list of used tasks in your system can be generated by the RTS-Configurator. Additionally this entry will exported in the Reference-Documentation by the RTS-Configurator too!.

So if you would like to know, which tasks with which priority are used in the runtime system, please look in the corresponding Reference-Documentation, in the Dep.m4 files for the macros or in the Dep.h files for the categories “Task”, “Task prefix” or “Task placeholder”.