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PTHREAD_ATTR_GETSCHEDPOLICYPOSIX Programmer's MaPTHREAD_ATTR_GETSCHEDPOLICY(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_getschedpolicy, pthread_attr_setschedpolicy - get and  set
       the schedpolicy attribute (REALTIME THREADS)

SYNOPSIS
       #include <pthread.h>

       int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
	      int *restrict policy);
       int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);


DESCRIPTION
       The   pthread_attr_getschedpolicy()  and	 pthread_attr_setschedpolicy()
       functions, respectively, shall get and set the schedpolicy attribute in
       the attr argument.

       The  supported values of policy shall include SCHED_FIFO, SCHED_RR, and
       SCHED_OTHER, which are defined in the <sched.h> header.	 When  threads
       executing  with	the  scheduling	 policy	 SCHED_FIFO,  SCHED_RR,	    or
       SCHED_SPORADIC  are waiting on a mutex, they shall acquire the mutex in
       priority order when the mutex is unlocked.

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

ERRORS
       The pthread_attr_setschedpolicy() function may fail if:

       EINVAL The value of policy 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_get-
       inheritsched()  , 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_GETSCHEDPOLICY(P)
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