PTHREAD_SETSCHEDPARAM(3)

NAME
       pthread_setschedparam,   pthread_getschedparam  -  control
       thread scheduling parameters

SYNOPSIS
       #include <<pthread.h>>

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

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

DESCRIPTION
       pthread_setschedparam sets the scheduling  parameters  for
       the thread target_thread as indicated by policy and param.
       policy can be either  SCHED_OTHER  (regular,  non-realtime
       scheduling),    SCHED_RR    (realtime,   round-robin)   or
       SCHED_FIFO (realtime, first-in first-out).   param  speci-
       fies  the  scheduling  priority for the two realtime poli-
       cies.  See  sched_setpolicy(2)  for  more  information  on
       scheduling policies.

       The  realtime  scheduling policies SCHED_RR and SCHED_FIFO
       are available only to processes with superuser privileges.

       pthread_getschedparam  retrieves the scheduling policy and
       scheduling parameters for  the  thread  target_thread  and
       store  them  in  the  locations  pointed  to by policy and
       param, respectively.

RETURN VALUE
       pthread_setschedparam and pthread_getschedparam  return  0
       on success and a non-zero error code on error.

ERRORS
       On  error,  pthread_setschedparam  returns  the  following
       error codes:
              EINVAL policy is not one of SCHED_OTHER,  SCHED_RR,
                     SCHED_FIFO
              EINVAL the priority value specified by param is not
                     valid for the specified policy
              EPERM  the calling process does not have  superuser
                     permissions
              ESRCH  the  target_thread is invalid or has already
                     terminated
              EFAULT param  points  outside  the  process  memory
                     space

       On  error,  pthread_getschedparam  returns  the  following
       error codes:
              ESRCH  the target_thread is invalid or has  already
                     terminated
              EFAULT policy  or  param  point outside the process
                     memory space

AUTHOR
       Xavier Leroy lt;Xavier.Leroy@inria.fr

SEE ALSO
       sched_setscheduler(2) sched_getscheduler(2) sched_get- 
       param(2) pthread_attr_setschedpolicy(3) 
       pthread_attr_setschedparam(3).