PTHREAD_SETSCHEDPRIO(3)                                                 Linux Programmer's Manual                                                PTHREAD_SETSCHEDPRIO(3)

NAME
       pthread_setschedprio - set scheduling priority of a thread

SYNOPSIS
       #include <pthread.h>

       int pthread_setschedprio(pthread_t thread, int prio);

       Compile and link with -pthread.

DESCRIPTION
       The  pthread_setschedprio()  function  sets  the  scheduling priority of the thread thread to the value specified in prio.  (By contrast pthread_setschedparam(3)
       changes both the scheduling policy and priority of a thread.)

RETURN VALUE
       On success, this function returns 0; on error, it returns a nonzero error number.  If pthread_setschedprio() fails, the scheduling  priority  of  thread  is  not
       changed.

ERRORS
       EINVAL prio is not valid for the scheduling policy of the specified thread.

       EPERM  The caller does not have appropriate privileges to set the specified priority.

       ESRCH  No thread with the ID thread could be found.

       POSIX.1 also documents an ENOTSUP ("attempt was made to set the priority to an unsupported value") error for pthread_setschedparam(3).

VERSIONS
       This function is available in glibc since version 2.3.4.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │pthread_setschedprio()                                                                                                                │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       For  a description of the permissions required to, and the effect of, changing a thread's scheduling priority, and details of the permitted ranges for priorities
       in each scheduling policy, see sched(7).

SEE ALSO
       getrlimit(2), sched_get_priority_min(2), pthread_attr_init(3), pthread_attr_setinheritsched(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3),
       pthread_create(3), pthread_self(3), pthread_setschedparam(3), pthreads(7), sched(7)

Linux                                                                          2021-03-22                                                        PTHREAD_SETSCHEDPRIO(3)