sched_getcpu(3)

1sched_getcpu(3)            Library Functions 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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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <sched.h>
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14       int sched_getcpu(void);
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16   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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18       sched_getcpu():
19           Since glibc 2.14:
20               _GNU_SOURCE
21           Before glibc 2.14:
22               _BSD_SOURCE || _SVID_SOURCE
23                   /* _GNU_SOURCE also suffices */
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DESCRIPTION

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

30       On success, sched_getcpu() returns a nonnegative CPU number.  On error,
31       -1 is returned and errno is set to indicate the error.
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ERRORS

34       ENOSYS This kernel does not implement getcpu(2).
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ATTRIBUTES

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

47       GNU.
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HISTORY

50       glibc 2.6.
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NOTES

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