pthread_attr_getschedpolicy(3p) — Linux manual page

PTHREAD...EDPOLICY(3P)  POSIX Programmer's Manual PTHREAD...EDPOLICY(3P)

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.

       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

       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 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

       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_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

       None.

SEE ALSO

       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.1‐2017,  pthread.h(0p),
       sched.h(0p)

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...EDPOLICY(3P)

Pages that refer to this page: pthread.h(0p), pthread_attr_getinheritsched(3p), pthread_attr_getschedparam(3p), pthread_attr_getscope(3p), pthread_attr_setschedpolicy(3p)

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