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| FreeRTOS xLists working how to? https://forum.osdev.org/viewtopic.php?f=1&t=57188 |
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| Author: | nullpointer [ Wed Mar 27, 2024 8:55 am ] |
| Post subject: | FreeRTOS xLists working how to? |
Hi, Can you , please, explain the working of xLists in FreeRTOS? Some drowings are highly appreciated. I've tried to read the code but sincerely a pointer member of an xListItem, which is a member of a task's TCB, that points to this same TCB ... this gives me a headache !! 1- Suppose that portMAX_PRIORITIES = 3, an array pxReadyTasksLists[3] is created by the kernel. pxReadyTasksLists[0] is a (pointer to a) list of all ready tasks with priority 0. pxReadyTasksLists[1] is a (pointer to a) list of all ready tasks with priority 1. ... etc - How pxReadyTasksLists[] is initialized before creating any tasks? 2- Now suppose there is only one task with priority 0 (idle task), 2 tasks with priority 1 and 3 tasks with priority 2. - How the xListItem member of a newly created task is initialized? - How the 3 lists are created (i.e how to insert a task in a list and how to sort the list) ? 3- How to search for the task with highest priority and how to remove it from the list? Thanks |
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