1 | /* |
2 | * Copyright (C) 2014 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "CPUCount.h" |
27 | #include <stdlib.h> |
28 | #include <sys/param.h> |
29 | #include <sys/types.h> |
30 | #include <unistd.h> |
31 | |
32 | #ifdef __APPLE__ |
33 | #include <sys/sysctl.h> |
34 | #endif |
35 | |
36 | static size_t count; |
37 | |
38 | size_t cpuCount() |
39 | { |
40 | if (count) |
41 | return count; |
42 | |
43 | #ifdef __APPLE__ |
44 | size_t length = sizeof(count); |
45 | int name[] = { |
46 | CTL_HW, |
47 | HW_NCPU |
48 | }; |
49 | int sysctlResult = sysctl(name, sizeof(name) / sizeof(int), &count, &length, 0, 0); |
50 | if (sysctlResult < 0) |
51 | abort(); |
52 | #else |
53 | long sysconfResult = sysconf(_SC_NPROCESSORS_ONLN); |
54 | if (sysconfResult < 0) |
55 | abort(); |
56 | count = sysconfResult; |
57 | #endif |
58 | |
59 | return count; |
60 | } |
61 | |