1SCHED_GETCPU(3) Linux Programmer's Manual SCHED_GETCPU(3)
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6 sched_getcpu - determine CPU on which the calling thread is running
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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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23 sched_getcpu() returns the number of the CPU on which the calling
24 thread is currently executing.
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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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31 ENOSYS This kernel does not implement getcpu(2).
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34 This function is available since glibc 2.6.
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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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47 sched_getcpu() is glibc-specific.
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50 The call
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52 cpu = sched_getcpu();
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54 is equivalent to the following getcpu(2) call:
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56 int c, s;
57 s = getcpu(&c, NULL, NULL);
58 cpu = (s == -1) ? s : c;
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61 getcpu(2), sched(7)
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64 This page is part of release 5.13 of the Linux man-pages project. A
65 description of the project, information about reporting bugs, and the
66 latest version of this page, can be found at
67 https://www.kernel.org/doc/man-pages/.
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71Linux 2021-03-22 SCHED_GETCPU(3)