I would like to create 4 threads, with the following attributes
SCHED_FIFO
thread 1 has priority value of 99
thread 2 of 99
thread 3 of 50
thread 4 of 20
(where the higher the number, the higher the priority. thus higher priority thread should preempt lower priority thread)
So I wrote this code:
pthread_attr_t thread_attribute;
pthread_t thread_id;
struct sched_param thread_param;
thread_param.sched_priority = 40;
printf("priority %d\n", thread_param.sched_priority);
pthread_attr_init( &thread_attribute );
pthread_attr_setdetachstate( &thread_attribute, PTHREAD_CREATE_DETACHED );
pthread_attr_setschedpolicy( &thread_attribute, SCHED_FIFO );
pthread_attr_setschedparam( &thread_attribute, &thread_param );
printf("current prio: %d\n", pthread_attr_getschedparam( &thread_attribute, &thread_param ));
sched_setscheduler( 0, SCHED_FIFO, &thread_param );
printf("current prio: %d\n", pthread_attr_getschedparam( &thread_attribute, &thread_param )); What I see on the screen is the prority value is 0 and 0. Am I setting the thread priority value the right way? Has anyone been able to change the scheduling policy and thread's priority?
