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

                     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 <Xavier.Leroy@inria.fr>


SEE ALSO

       sched_setscheduler(2),  sched_getscheduler(2),  sched_get­
       param(2),                  pthread_attr_setschedpolicy(3),
       pthread_attr_setschedparam(3).


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