2 * Copyright (C) 2012 University of Szeged. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
13 * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include "NumberOfCores.h"
29 #if OS(DARWIN) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD)
30 #include <sys/param.h>
31 // sys/types.h must come before sys/sysctl.h because the latter uses
32 // data types defined in the former. See sysctl(3) and style(9).
33 #include <sys/types.h>
34 #include <sys/sysctl.h>
35 #elif OS(LINUX) || OS(AIX) || OS(SOLARIS)
37 #elif OS(WINDOWS) || OS(QNX)
38 #include <wtf/UnusedParam.h>
42 #include <sys/syspage.h>
48 int numberOfProcessorCores()
50 const int defaultIfUnavailable = 1;
51 static int s_numberOfCores = -1;
53 if (s_numberOfCores > 0)
54 return s_numberOfCores;
56 #if OS(DARWIN) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD)
58 size_t length = sizeof(result);
63 int sysctlResult = sysctl(name, sizeof(name) / sizeof(int), &result, &length, 0, 0);
65 s_numberOfCores = sysctlResult < 0 ? defaultIfUnavailable : result;
66 #elif OS(LINUX) || OS(AIX) || OS(SOLARIS)
67 long sysconfResult = sysconf(_SC_NPROCESSORS_ONLN);
69 s_numberOfCores = sysconfResult < 0 ? defaultIfUnavailable : static_cast<int>(sysconfResult);
71 UNUSED_PARAM(defaultIfUnavailable);
73 GetSystemInfo(&sysInfo);
75 s_numberOfCores = sysInfo.dwNumberOfProcessors;
77 UNUSED_PARAM(defaultIfUnavailable);
79 s_numberOfCores = _syspage_ptr->num_cpu;
81 s_numberOfCores = defaultIfUnavailable;
83 return s_numberOfCores;