mirror of https://github.com/mkerrisk/man-pages
109 lines
2.6 KiB
Groff
109 lines
2.6 KiB
Groff
.\" Copyright (c) 2008, Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH SCHED_GETCPU 3 2021-03-22 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sched_getcpu \- determine CPU on which the calling thread is running
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.SH SYNOPSIS
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.nf
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.B #include <sched.h>
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.PP
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.B int sched_getcpu(void);
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.fi
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.PP
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.RS -4
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.RE
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.PP
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.BR sched_getcpu ():
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.nf
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Since glibc 2.14:
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_GNU_SOURCE
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Before glibc 2.14:
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_BSD_SOURCE || _SVID_SOURCE
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/* _GNU_SOURCE also suffices */
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.fi
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.SH DESCRIPTION
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.BR sched_getcpu ()
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returns the number of the CPU on which the calling thread is currently executing.
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.SH RETURN VALUE
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On success,
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.BR sched_getcpu ()
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returns a nonnegative CPU number.
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On error, \-1 is returned and
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.I errno
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is set to indicate the error.
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.SH ERRORS
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.TP
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.B ENOSYS
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This kernel does not implement
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.BR getcpu (2).
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.SH VERSIONS
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This function is available since glibc 2.6.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR sched_getcpu ()
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T} Thread safety MT-Safe
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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.BR sched_getcpu ()
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is glibc-specific.
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.SH NOTES
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The call
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.PP
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.in +4n
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.EX
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cpu = sched_getcpu();
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.EE
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.in
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.PP
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is equivalent to the following
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.BR getcpu (2)
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call:
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.PP
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.in +4n
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.EX
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int c, s;
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s = getcpu(&c, NULL, NULL);
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cpu = (s == \-1) ? s : c;
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.EE
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.in
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.SH SEE ALSO
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.BR getcpu (2),
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.BR sched (7)
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