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1 // Copyright 2012 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 #include <features.h>
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6 #include <sched.h>
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7
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8 // CPU_COUNT is only provided by glibc 2.6 or higher
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9 #ifndef CPU_COUNT
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10 #define CPU_COUNT(set) _CPU_COUNT((unsigned int *)(set), sizeof(*(set))/sizeof(unsigned int))
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11 static int _CPU_COUNT(unsigned int *set, size_t len) {
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12 int cnt;
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13
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14 cnt = 0;
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15 while (len--)
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16 cnt += __builtin_popcount(*set++);
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17 return cnt;
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18 }
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19 #endif
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20
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21 #include "runtime.h"
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22 #include "defs.h"
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23
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24 int32
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25 getproccount(void)
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26 {
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27 cpu_set_t set;
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28 int32 r, cnt;
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29
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30 cnt = 0;
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31 r = sched_getaffinity(0, sizeof(set), &set);
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32 if(r == 0)
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33 cnt += CPU_COUNT(&set);
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34
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35 return cnt ? cnt : 1;
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36 }
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