PTHREAD_ATTR_GETINHERITSCHED(3P)                    POSIX Programmer's Manual                   PTHREAD_ATTR_GETINHERITSCHED(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       pthread_attr_getinheritsched, pthread_attr_setinheritsched - get and set the inheritsched attribute (REALTIME THREADS)

SYNOPSIS
       #include <pthread.h>

       int pthread_attr_getinheritsched(const pthread_attr_t *restrict attr,
              int *restrict inheritsched);
       int pthread_attr_setinheritsched(pthread_attr_t *attr,
              int inheritsched);


DESCRIPTION
       The  pthread_attr_getinheritsched(),  and  pthread_attr_setinheritsched()  functions, respectively, shall get and set the
       inheritsched attribute in the attr argument.

       When the attributes objects are used by pthread_create(), the inheritsched attribute determines how the other  scheduling
       attributes of the created thread shall be set.

       PTHREAD_INHERIT_SCHED

              Specifies  that  the  thread scheduling attributes shall be inherited from the creating thread, and the scheduling
              attributes in this attr argument shall be ignored.

       PTHREAD_EXPLICIT_SCHED

              Specifies that the thread scheduling attributes shall be set to the  corresponding  values  from  this  attributes
              object.


       The symbols PTHREAD_INHERIT_SCHED and PTHREAD_EXPLICIT_SCHED are defined in the <pthread.h> header.

       The  following  thread  scheduling attributes defined by IEEE Std 1003.1-2001 are affected by the inheritsched attribute:
       scheduling policy ( schedpolicy), scheduling parameters ( schedparam), and  scheduling  contention  scope  (  contention-
       scope).

RETURN VALUE
       If  successful, the pthread_attr_getinheritsched() and pthread_attr_setinheritsched() functions shall return zero; other-
       wise, an error number shall be returned to indicate the error.

ERRORS
       The pthread_attr_setinheritsched() function may fail if:

       EINVAL The value of inheritsched 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_getschedpolicy(),     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, Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                              PTHREAD_ATTR_GETINHERITSCHED(3P)