Dear Sir,
I am testing RTEMS POSIX thread priority. I am still using RTEMS 4.12 in 2017 year. There are four pthreads(main, pthread1, pthread2, pthread3) on two cores in my test case. - main pthread is running on core 1. - pthread1, pthread2, pthread3 is running on core 2. - All threads are doing GPIO toggling action in while(1) loop. - my configuration for timeslice quantum is 25ms. As I know from RTEMS POSIX manual, there is below statement. In the RTEMS implementation of the POSIX API, the priorities range from the low priority of sched_get_priority_min() to the highest priority of sched_get_priority_max(). Numerically higher values represent higher priorities. But, when I test this, lower value is doing as higher priority. Higher value is doing as lower priority. Is this correct operation ? Case 0) All threads are same priority. [/] # pthread ID NAME CPU SHED PRI STATE MODES EVENTS WAITINFO ---------------------------------------------------------------------------- -- 0b010001 main_thread 1 MEDF 2147483645 READY P:T:nA NONE 0b010002 pthread1 2 MEDF 2147483645 READY P:T:nA NONE 0b010003 pthread2 2 MEDF 2147483645 READY P:T:nA NONE 0b010004 pthread3 2 MEDF 2147483645 READY P:T:nA NONE Case 1) pthread3 is lower priority according to manual. But, pthread3 is higher priority in my case. [/] # pthread ID NAME CPU SHED PRI STATE MODES EVENTS WAITINFO ---------------------------------------------------------------------------- -- 0b010001 main_thread 1 MEDF 2147483645 READY P:T:nA NONE 0b010002 pthread1 2 MEDF 2147483646 READY P:T:nA NONE 0b010003 pthread2 2 MEDF 2147483646 READY P:T:nA NONE 0b010004 pthread3 2 MEDF 1789569706 READY P:T:nA NONE Case 2) pthread3 is higher priority according to manual. pthread1 and pthread2 are higher priority than pthread3. [/] # pthread ID NAME CPU SHED PRI STATE MODES EVENTS WAITINFO ---------------------------------------------------------------------------- -- 0b010001 main_thread 1 MEDF 2147483645 READY P:T:nA NONE 0b010002 pthread1 2 MEDF 1789569706 READY P:T:nA NONE 0b010003 pthread2 2 MEDF 1789569706 READY P:T:nA NONE 0b010004 pthread3 2 MEDF 2147483646 READY P:T:nA NONE Please advise. Best Regards, JunBeom Kim ~~~~~~~~~~~~~~~~~~~~~~ President / EmbedCoreTech Phone: +82-31-396-5584 Fax: +82-504-065-5720 Mobile:+82-10-6425-5720 Email: <mailto:jb...@e-coretech.kr> jb...@e-coretech.kr Web: <http://www.e-coretech.kr> www.e-coretech.kr ~~~~~~~~~~~~~~~~~~~~~~
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