sched_getcpu(3)

1SCHED_GETCPU(3)            Linux Programmer's Manual           SCHED_GETCPU(3)
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NAME

6       sched_getcpu - determine CPU on which the calling thread is running
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SYNOPSIS

9       #include <sched.h>
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11       int sched_getcpu(void);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       sched_getcpu():
16           Since glibc 2.14:
17               _GNU_SOURCE
18           Before glibc 2.14:
19               _BSD_SOURCE || _SVID_SOURCE
20                   /* _GNU_SOURCE also suffices */
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DESCRIPTION

23       sched_getcpu()  returns  the  number  of  the  CPU on which the calling
24       thread is currently executing.
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RETURN VALUE

27       On success, sched_getcpu() returns a nonnegative CPU number.  On error,
28       -1 is returned and errno is set to indicate the error.
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ERRORS

31       ENOSYS This kernel does not implement getcpu(2).
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VERSIONS

34       This function is available since glibc 2.6.
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ATTRIBUTES

37       For   an   explanation   of   the  terms  used  in  this  section,  see
38       attributes(7).
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40       ┌───────────────┬───────────────┬─────────┐
41       │Interface      │ Attribute     │ Value   │
42       ├───────────────┼───────────────┼─────────┤
43       │sched_getcpu() │ Thread safety │ MT-Safe │
44       └───────────────┴───────────────┴─────────┘

CONFORMING TO

46       sched_getcpu() is glibc-specific.
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NOTES

49       The call
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51           cpu = sched_getcpu();
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53       is equivalent to the following getcpu(2) call:
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55           int c, s;
56           s = getcpu(&c, NULL, NULL);
57           cpu = (s == -1) ? s : c;
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COLOPHON

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64       description  of  the project, information about reporting bugs, and the
65       latest    version    of    this    page,    can     be     found     at
66       https://www.kernel.org/doc/man-pages/.
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70Linux                             2017-09-15                   SCHED_GETCPU(3)