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add sched_getcpu

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This is a GNU extension, but a fairly minor one, for a system call that
otherwise has no libc wrapper.
This commit is contained in:
Nathan Zadoks 2016-03-02 17:26:26 +01:00 committed by Rich Felker
parent 29b1357537
commit 98d335735d
2 changed files with 14 additions and 0 deletions
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1
include/sched.h
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@ -76,6 +76,7 @@ void free(void *);
typedef struct cpu_set_t { unsigned long __bits[128/sizeof(long)]; } cpu_set_t;
int __sched_cpucount(size_t, const cpu_set_t *);
int sched_getcpu(void);
int sched_getaffinity(pid_t, size_t, cpu_set_t *);
int sched_setaffinity(pid_t, size_t, const cpu_set_t *);

13
src/sched/sched_getcpu.c Normal file
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@ -0,0 +1,13 @@
#define _GNU_SOURCE
#include <sched.h>
#include "syscall.h"
int sched_getcpu(void)
{
int r;
unsigned cpu;
r = __syscall(SYS_getcpu, &cpu, 0, 0);
if (!r) return cpu;
return __syscall_ret(r);
}