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.bie...@axelsw.it
Web Site: www.axelsw.it
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