1/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <sched.h>
19
20
21int
22__sched_cpucount (size_t setsize, const cpu_set_t *setp)
23{
24 int s = 0;
25 const __cpu_mask *p = setp->__bits;
26 const __cpu_mask *end = &setp->__bits[setsize / sizeof (__cpu_mask)];
27
28 while (p < end)
29 {
30 __cpu_mask l = *p++;
31
32#ifdef POPCNT
33 s += POPCNT (l);
34#else
35 if (l == 0)
36 continue;
37
38 _Static_assert (sizeof (l) == sizeof (unsigned int)
39 || sizeof (l) == sizeof (unsigned long)
40 || sizeof (l) == sizeof (unsigned long long),
41 "sizeof (__cpu_mask");
42 if (sizeof (__cpu_mask) == sizeof (unsigned int))
43 s += __builtin_popcount (l);
44 else if (sizeof (__cpu_mask) == sizeof (unsigned long))
45 s += __builtin_popcountl (l);
46 else
47 s += __builtin_popcountll (l);
48#endif
49 }
50
51 return s;
52}
53