thr_setprio(3C) 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 Syntax.
#include <thread.h> int thr_setprio(thread_t tid, int newprio)
The range of valid priorities for a thread depends on its scheduling policy.
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);