sched_rr_get_interval(2) — Справочная страница Linux

sched_rr_get_interval(2)   System Calls Manual  sched_rr_get_interval(2)

НАЗВАНИЕ

       sched_rr_get_interval - get the SCHED_RR interval for the named
       process

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <sched.h>

       int sched_rr_get_interval(pid_t pid, struct timespec *tp);

ОПИСАНИЕ

       sched_rr_get_interval() writes into the timespec(3) structure
       pointed to by tp the round-robin time quantum for the process
       identified by pid.  The specified process should be running under
       the SCHED_RR scheduling policy.

       If pid is zero, the time quantum for the calling process is
       written into *tp.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       On success, sched_rr_get_interval() returns 0.  On error, -1 is
       returned, and errno is set to indicate the error.

ОШИБКИ

       EFAULT Problem with copying information to user space.

       EINVAL Invalid pid.

       ENOSYS The system call is not yet implemented (only on rather old
              kernels).

       ESRCH  Could not find a process with the ID pid.

ВЕРСИИ

   Linux
       Linux 3.9 added a new mechanism for adjusting (and viewing) the
       SCHED_RR quantum: the /proc/sys/kernel/sched_rr_timeslice_ms file
       exposes the quantum as a millisecond value, whose default is 100.
       Writing 0 to this file resets the quantum to the default value.

СТАНДАРТЫ

       POSIX.1-2008.

ИСТОРИЯ

       POSIX.1-2001.

   Linux
       POSIX does not specify any mechanism for controlling the size of
       the round-robin time quantum.  Older Linux kernels provide a
       (nonportable) method of doing this.  The quantum can be
       controlled by adjusting the process's nice value (see
       setpriority(2)).  Assigning a negative (i.e., high) nice value
       results in a longer quantum; assigning a positive (i.e., low)
       nice value results in a shorter quantum.  The default quantum is
       0.1 seconds; the degree to which changing the nice value affects
       the quantum has varied somewhat across kernel versions.  This
       method of adjusting the quantum was removed starting with Linux
       2.6.24.

ПРИМЕЧАНИЯ

       POSIX systems on which sched_rr_get_interval() is available
       define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.

СМОТРИТЕ ТАКЖЕ

       timespec(3), sched(7)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02       sched_rr_get_interval(2)

Страницы, которые ссылаются на эту страницу: sched_setattr(2), sched_setscheduler(2), syscalls(2), proc_sys_kernel(5), sched(7)