PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

PTHREAD_ATTR_GETSCHEDPOLICY(3P) Programmer's ManualD_ATTR_GETSCHEDPOLICY(3P)

PROLOG         top

       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         top

       pthread_attr_getschedpolicy, pthread_attr_setschedpolicy — get and
       set the schedpolicy attribute (REALTIME THREADS)

SYNOPSIS         top

       #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         top

       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.

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

RETURN VALUE         top

       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         top

       The pthread_attr_setschedpolicy() function shall fail if:

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

       The pthread_attr_setschedpolicy() function may fail if:

       EINVAL The value of policy is not valid.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       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         top

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

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       pthread_attr_destroy(3p), pthread_attr_getscope(3p),
       pthread_attr_getinheritsched(3p), pthread_attr_getschedparam(3p),
       pthread_create(3p)

       The   Base   Definitions   volume   of  POSIX.1‐2008,  pthread.h(0p),
       sched.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/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                 2013     PTHREAD_ATTR_GETSCHEDPOLICY(3P)