NAME

       pthread_attr_getschedpolicy,  pthread_attr_setschedpolicy  -  get  and set the schedpolicy
       attribute (REALTIME THREADS)

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
              int *restrict policy);
       int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);

DESCRIPTION

       The    pthread_attr_getschedpolicy()    and    pthread_attr_setschedpolicy()    functions,
       respectively, shall get and set the schedpolicy attribute in the attr argument.

       The  supported values of policy shall include SCHED_FIFO, SCHED_RR, and SCHED_OTHER, which
       are defined in the <sched.h> header.  When threads executing with  the  scheduling  policy
       SCHED_FIFO, SCHED_RR,    or SCHED_SPORADIC  are waiting on a mutex, they shall acquire the
       mutex in priority order when the mutex is unlocked.

RETURN VALUE

       If  successful,  the   pthread_attr_getschedpolicy()   and   pthread_attr_setschedpolicy()
       functions  shall return zero; otherwise, an error number shall be returned to indicate the
       error.

ERRORS

       The pthread_attr_setschedpolicy() function may fail if:

       EINVAL The value of policy is not valid.

       ENOTSUP
              An attempt was made to set the attribute to an unsupported value.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       After these attributes have  been  set,  a  thread  can  be  created  with  the  specified
       attributes  using  pthread_create().  Using  these  routines  does  not affect the current
       running thread.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_attr_destroy()  ,  pthread_attr_getscope()  ,   pthread_attr_getinheritsched()   ,
       pthread_attr_getschedparam()   ,   pthread_create()  ,  the  Base  Definitions  volume  of
       IEEE Std 1003.1-2001, <pthread.h>, <sched.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .