/sys$common/syshlp/helplib.hlb POSIX Threads, PTHREAD routines, pthread_setschedparam, C Binding  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    #include <pthread.h>

    int
    pthread_setschedparam (
             pthread_t   thread,
             int   policy,
             const struct sched_param   *param);