PTHREAD_ATTR_GETSCOPE(3P)                           POSIX Programmer's Manual                          PTHREAD_ATTR_GETSCOPE(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_getscope, pthread_attr_setscope - get and set the contentionscope attribute (REALTIME THREADS)

SYNOPSIS
       #include <pthread.h>

       int pthread_attr_getscope(const pthread_attr_t *restrict attr,
              int *restrict contentionscope);
       int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);


DESCRIPTION
       The  pthread_attr_getscope()  and  pthread_attr_setscope() functions, respectively, shall get and set the contentionscope
       attribute in the attr object.

       The contentionscope attribute may have the values PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention scope, or
       PTHREAD_SCOPE_PROCESS,   signifying   process   scheduling   contention  scope.   The  symbols  PTHREAD_SCOPE_SYSTEM  and
       PTHREAD_SCOPE_PROCESS are defined in the <pthread.h> header.

RETURN VALUE
       If successful, the pthread_attr_getscope() and pthread_attr_setscope() functions shall return zero; otherwise,  an  error
       number shall be returned to indicate the error.

ERRORS
       The pthread_attr_setscope() function may fail if:

       EINVAL The value of contentionscope 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_getinheritsched(),   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_GETSCOPE(3P)