Last change
on this file since 337 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
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native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
879 bytes
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Rev | Line | |
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[337] | 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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