PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (consult 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.

       The  behavior  is  undefined  if  the  value specified by the attr argument to pthread_attr_getscope() or
       pthread_attr_setscope() does not refer to an initialized thread attributes object.

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 shall fail if:

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

       The pthread_attr_setscope() function may fail if:

       EINVAL The value of contentionscope is not valid.

       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.

       See Section 2.9.4, Thread Scheduling for further  details  on  thread  scheduling  attributes  and  their
       default settings.

RATIONALE

       If  an implementation detects that the value specified by the attr argument to pthread_attr_getscope() or
       pthread_attr_setscope() does not refer to an initialized thread attributes object, it is recommended that
       the function should fail and report an [EINVAL] error.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_attr_destroy(), pthread_attr_getinheritsched(), pthread_attr_getschedpolicy(),
       pthread_attr_getschedparam(), pthread_create()

       The Base Definitions volume of POSIX.1‐2017, <pthread.h>, <sched.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 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 .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                         PTHREAD_ATTR_GETSCOPE(3POSIX)