Determine cpu on which the calling thread is running
#include <sched.h> int sched_getcpu(void);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.14:
Before glibc 2.14:
_BSD_SOURCE || _SVID_SOURCE
/* _GNU_SOURCE also suffices */
sched_getcpu() returns the number of the CPU on which the calling thread is currently executing.
On success, sched_getcpu() returns a nonnegative CPU number. On error, -1 is returned and errno is set to indicate the error.
This kernel does not implement getcpu(2).
This function is available since glibc 2.6.
The sched_getcpu() function is thread-safe.
sched_getcpu() is glibc-specific.
cpu = sched_getcpu();
is equivalent to the following getcpu(2) call:
int c, s; s = getcpu(&c, NULL, NULL); cpu = (s == -1) ? s : c;
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