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



NAME
       pthread_attr_setschedparam,  pthread_attr_getschedparam  -  set/get  scheduling  parameter
       attributes in thread attributes object

SYNOPSIS
       #include <pthread.h>

       int pthread_attr_setschedparam(pthread_attr_t *attr,
                                      const struct sched_param *param);
       int pthread_attr_getschedparam(const pthread_attr_t *attr,
                                      struct sched_param *param);

       Compile and link with -pthread.

DESCRIPTION
       The pthread_attr_setschedparam() function sets the scheduling parameter attributes of  the
       thread attributes object referred to by attr to the values specified in the buffer pointed
       to by param.  These attributes determine the scheduling parameters  of  a  thread  created
       using the thread attributes object attr.

       The pthread_attr_getschedparam() returns the scheduling parameter attributes of the thread
       attributes object attr in the buffer pointed to by param.

       Scheduling parameters are maintained in the following structure:

           struct sched_param {
               int sched_priority;     /* Scheduling priority */
           };

       As can be seen, only one scheduling parameter is supported.  For details of the  permitted
       ranges for scheduling priorities in each scheduling policy, see sched(7).

       In  order  for  the  parameter setting made by pthread_attr_setschedparam() to have effect
       when calling pthread_create(3), the caller must use pthread_attr_setinheritsched(3) to set
       the inherit-scheduler attribute of the attributes object attr to PTHREAD_EXPLICIT_SCHED.

RETURN VALUE
       On success, these functions return 0; on error, they return a nonzero error number.

ERRORS
       POSIX.1  documents  EINVAL  and ENOTSUP errors for pthread_attr_setschedparam().  On Linux
       these functions always succeed (but portable and future-proof applications  should  never‐
       theless handle a possible error return).

ATTRIBUTES
   Multithreading (see pthreads(7))
       The  pthread_attr_setschedparam()  and  pthread_attr_getschedparam() functions are thread-
       safe.

CONFORMING TO
       POSIX.1-2001.

NOTES
       See pthread_attr_setschedpolicy(3) for a list of the thread scheduling policies  supported
       on Linux.

EXAMPLE
       See pthread_setschedparam(3).

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

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



Linux                                       2014-05-21              PTHREAD_ATTR_SETSCHEDPARAM(3)