PTHREAD_SCHEDPARAM(3)  FreeBSD Library Functions Manual  PTHREAD_SCHEDPARAM(3)

NAME
     pthread_setschedparam, pthread_getschedparam - thread scheduling
     parameter manipulation

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

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

     int
     pthread_getschedparam(pthread_t thread, int *restrict policy,
         struct sched_param *restrict param);

DESCRIPTION
     The pthread_setschedparam() and pthread_getschedparam() functions set and
     get the scheduling parameters of individual threads.  The scheduling
     policy for a thread can either be SCHED_FIFO (first in, first out),
     SCHED_RR (round-robin), or SCHED_OTHER (timesharing).  Valid thread
     priorities (accessed via param->sched_priority) must be within the range
     returned by the sched_get_priority_min(2) and sched_get_priority_max(2)
     system calls.

RETURN VALUES
     If successful, these functions return 0.  Otherwise, an error number is
     returned to indicate the error.

ERRORS
     The pthread_setschedparam() function will fail if:

     [EINVAL]           Invalid value for policy.

     [ENOTSUP]          Invalid value for scheduling parameters.

     [ESRCH]            Non-existent thread thread.

     The pthread_getschedparam() function will fail if:

     [ESRCH]            Non-existent thread thread.

SEE ALSO
     sched_get_priority_max(2), sched_get_priority_min(2)

STANDARDS
     The pthread_setschedparam() and pthread_getschedparam() functions conform
     to Version 2 of the Single UNIX Specification ("SUSv2").

FreeBSD 13.1-RELEASE-p6         August 17, 2018        FreeBSD 13.1-RELEASE-p6