Dear Mr. Koo.
There is not any relationship between main thread and pthread1/2/3. Main thread is run on core 1 of Cortex-A9. Pthread1/2/3 threads is run on core 2 of Cortex-A9. That is, both main thread and pthread1/2/3 is run on each cores independently. Also, I used manual affinity using pthread_setaffinity_np(). Pthread1/2/3 is created by main thread. and, actual operation is using Qt Thread API. I attached simple example code. Qt Thread API is calling RTEMS POSIX API. Best Regards, JunBeom From: ch...@kari.re.kr <ch...@kari.re.kr> Sent: Friday, December 28, 2018 4:05 PM To: JunBeom Kim (EmbedCoreTech) <jb...@e-coretech.kr> Cc: users@rtems.org Subject: RE: RTEMS POSIX Priority Inversion Issue. What is the relation between main thread and pthread1/2/3? If the main thread has a control to wake up each pthread1/2/3, it gonna be in trouble when the prioirty of the main thread is lower than pthread1/2/3s because the main thread has never chance to run it, which is required to other threads. However why do you assign so much long integer value to priority? Cheol --------- 원본 메일 --------- 보낸사람 : "JunBeom Kim (EmbedCoreTech)" <jb...@e-coretech.kr <mailto:jb...@e-coretech.kr> > 받는사람 : <users@rtems.org <mailto:users@rtems.org> > 받은날짜 : 2018-12-28 (금) 15:45:48 제목 : RTEMS POSIX Priority Inversion Issue. 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: jb...@e-coretech.kr <mailto:jb...@e-coretech.kr> Web: www.e-coretech.kr <http://www.e-coretech.kr> ~~~~~~~~~~~~~~~~~~~~~~ <https://webmail.kari.re.kr:443/checkread/MTA2NjIz/amJraW1AZS1jb3JldGVjaC5rcg==/>
main.cpp
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