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PTHREAD_ATTR_GETINHERITSCHEPOSIX Programmer's MPTHREAD_ATTR_GETINHERITSCHED(P)



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 inher-
       itsched 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 inher-
	      ited 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 ( contentionscope).

RETURN VALUE
       If successful, the pthread_attr_getinheritsched() and pthread_attr_set-
       inheritsched()  functions shall return zero; otherwise, 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,  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 .



IEEE/The Open Group		     2003      PTHREAD_ATTR_GETINHERITSCHED(P)
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