From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4DC96142.7020008@domain.hid> Date: Tue, 10 May 2011 18:01:06 +0200 From: Roberto Bielli MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: [Xenomai-core] SWITCH TASK TO SECONDARY MODE DURING GDB SESSION DOESN'T WORK List-Id: Xenomai life and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: xenomai@xenomai.org Hi, i try the next C code in a gdb session on a ARM target with brakpoints and i found a strange behaviour. I expected that the task 'tsk1' never execute instead if i put a breakpoint on the instruction 'varInt += 1;' i see that it's executed. I sospect that there is this behavior: 1. i start gdb with application. The application is not running. 2. i enable the breakpoint on the instruction 'err = rt_task_start(&tsk1, &test_tsk1, NULL );' 3. i enable the breakpoint on the instruction 'varInt += 1;' in tsk1 4. run the application that stop on the instruction 'err = rt_task_start(&tsk1, &test_tsk1, NULL );' so the task is in secondary mode for the breakpoint hit if i understand correctly . 5. i make a single step and do the rt_task_start in main, so i see that i break in the task on the instruction 'varInt += 1;' in tsk1 this is strange because main has shadow and has a priority equal o 99, instead tsk1 has a priority equal to 49. 6, the program execute the instruction 'varInt += 1;' and then return to main. 7 then the main has always the control. The question is: Why the priority is not respected ? I think this. Maybe the main is in secondary mode for the breakpoint and when make a rt_task_create the new task is in primary mode for the initial instruction. Then receive the signal ( verified with rt_task_set_mode(0, T_WARNSW, NULL); ) and switch to secondary mode but initially the task tsk is in primary mode and execute before main. Is a known problem ? Best Regards CODE--------------------------------- int varInt = 0; RT_TASK tsk1, tskMain; int main (int argc, char *argv[]) { int err; mlockall(MCL_CURRENT|MCL_FUTURE); rt_task_shadow(&tskMain, "main", 99, 0); err = rt_task_create( &tsk1, "tsk1", 0, 49, T_FPU ); err = rt_task_start(&tsk1, &test_tsk1, NULL ); for (;;) { if( varInt > 1 ) break; } printf("Task started\n"); return 0; } void test_tsk1( void * args ) { for( ;;) { varInt += 1; rt_task_sleep( 100000000 ); } } -- +------------------------------------------------------------------------------------------------+ Roberto Bielli Sviluppo Software Axel S.r.l. Via Del Cannino, 3 21020 Crosio Della Valle Varese - Italy Telefono: +39 0332 949600 Fax: +39 0332 969315 E-mail: roberto.bielli@domain.hid Web Site: www.axelsw.it +------------------------------------------------------------------------------------------------+ Si precisa che le informazioni contenute in questo messaggio sono riservate e ad uso esclusivo del destinatario. Qualora il messaggio in parola Le fosse pervenuto per errore, La preghiamo di eliminarlo senza copiarlo e di non inoltrarlo a terzi, dandocene gentilmente comunicazione. Grazie. Informativa sul trattamento dei dati personali (D. Lgs. 196/2003). I dati utilizzati per la spedizione del presente messaggio sono utilizzati da Axel S.r.l., titolare del trattamento, per l'invio delle comunicazioni dei diversi settori aziendali, non essendo autorizzata la divulgazione a terzi. Potrete rivolgere alla seguente mail richieste di verifica, rettifica o cancellazione dei Vostri dati: info@domain.hid This e-mail and any attachments is confidential and may contain privileged information intended for the addressee(s) only. Dissemination, copying, printing or use by anybody else is unauthorised. If you are not the intended recipient, please delete this message and any attachments and advise the sender by return e-mail.Thank you. +------------------------------------------------------------------------------------------------+