Last change
on this file since 445 was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:eol-style
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Property svn:mime-type
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File size:
879 bytes
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1 | #define _GNU_SOURCE
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2 | #include <errno.h>
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3 | #include <sched.h>
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4 | #include "syscall.h"
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5 | #include "atomic.h"
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6 |
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7 | #ifdef VDSO_GETCPU_SYM
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8 |
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9 | void *__vdsosym(const char *, const char *);
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10 |
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11 | static void *volatile vdso_func;
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12 |
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13 | typedef long (*getcpu_f)(unsigned *, unsigned *, void *);
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14 |
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15 | static long getcpu_init(unsigned *cpu, unsigned *node, void *unused)
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16 | {
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17 | void *p = __vdsosym(VDSO_GETCPU_VER, VDSO_GETCPU_SYM);
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18 | getcpu_f f = (getcpu_f)p;
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19 | a_cas_p(&vdso_func, (void *)getcpu_init, p);
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20 | return f ? f(cpu, node, unused) : -ENOSYS;
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21 | }
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22 |
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23 | static void *volatile vdso_func = (void *)getcpu_init;
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24 |
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25 | #endif
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26 |
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27 | int sched_getcpu(void)
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28 | {
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29 | int r;
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30 | unsigned cpu;
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31 |
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32 | #ifdef VDSO_GETCPU_SYM
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33 | getcpu_f f = (getcpu_f)vdso_func;
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34 | if (f) {
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35 | r = f(&cpu, 0, 0);
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36 | if (!r) return cpu;
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37 | if (r != -ENOSYS) return __syscall_ret(r);
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38 | }
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39 | #endif
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40 |
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41 | r = __syscall(SYS_getcpu, &cpu, 0, 0);
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42 | if (!r) return cpu;
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43 | return __syscall_ret(r);
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44 | }
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