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_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.

       The supported values of inheritsched shall be:

       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  POSIX.1‐2008  are  affected  by  the  inheritsched
       attribute: scheduling policy (schedpolicy), scheduling parameters (schedparam), and scheduling contention
       scope (contentionscope).

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

RETURN VALUE

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

ERRORS

       The pthread_attr_setinheritsched() function shall fail if:

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

       The pthread_attr_setinheritsched() function may fail if:

       EINVAL The value of inheritsched 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_getinheritsched()  or pthread_attr_setinheritsched() 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_getscope(), 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 .