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| .TH SCHED_GETCPU 3 2015-03-02 "Linux" "Linux Programmer's Manual" |
| .SH NAME |
| sched_getcpu \- determine CPU on which the calling thread is running |
| .SH SYNOPSIS |
| .nf |
| .B #include <sched.h> |
| |
| .B int sched_getcpu(void); |
| .fi |
| .sp |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .sp |
| .BR sched_getcpu (): |
| .ad l |
| .RS 4 |
| .PD 0 |
| .TP 4 |
| Since glibc 2.14: |
| _GNU_SOURCE |
| .TP 4 |
| Before glibc 2.14: |
| _BSD_SOURCE || _SVID_SOURCE |
| /* _GNU_SOURCE also suffices */ |
| .PD |
| .RE |
| .ad b |
| .SH DESCRIPTION |
| .BR sched_getcpu () |
| returns the number of the CPU on which the calling thread is currently executing. |
| .SH RETURN VALUE |
| On success, |
| .BR sched_getcpu () |
| returns a nonnegative CPU number. |
| On error, \-1 is returned and |
| .I errno |
| is set to indicate the error. |
| .SH ERRORS |
| .TP |
| .B ENOSYS |
| This kernel does not implement |
| .BR getcpu (2). |
| .SH VERSIONS |
| This function is available since glibc 2.6. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR sched_getcpu () |
| T} Thread safety MT-Safe |
| .TE |
| .SH CONFORMING TO |
| .BR sched_getcpu () |
| is glibc-specific. |
| .SH NOTES |
| The call |
| .in +4n |
| .nf |
| |
| cpu = sched_getcpu(); |
| |
| .fi |
| .in |
| is equivalent to the following |
| .BR getcpu (2) |
| call: |
| .in +4n |
| .nf |
| |
| int c, s; |
| s = getcpu(&c, NULL, NULL); |
| cpu = (s == \-1) ? s : c; |
| .fi |
| .in |
| .SH SEE ALSO |
| .BR getcpu (2), |
| .BR sched (7) |