thr_setprio(3THR)

thr_setprio(3THR) changes the priority of the thread, specified by tid, within the current process to the priority specified by newprio. (For POSIX threads, see pthread_setschedparam(3THR).)

#include <thread.h>

int thr_setprio(thread_t tid, int newprio)

By default, threads are scheduled based on fixed priorities that range from zero, the least significant, to 127 the most significant.

thread_t tid;
int ret;
int newprio = 20;

/* suspended thread creation */
ret = thr_create(NULL, NULL, func, arg, THR_SUSPENDED, &tid);

/* set the new priority of suspended child thread */
ret = thr_setprio(tid, newprio);

/* suspended child thread starts executing with new priority */
ret = thr_continue(tid);