85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/*
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* Copyright (C) 2012 University of Szeged. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/NumberOfCores.h>
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#include <cstdio>
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#if OS(DARWIN)
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#include <sys/sysctl.h>
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#elif OS(LINUX) || OS(AIX) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD)
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#include <unistd.h>
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#elif OS(WINDOWS)
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#include <windows.h>
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#endif
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namespace WTF {
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int numberOfProcessorCores()
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{
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const int defaultIfUnavailable = 1;
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static int s_numberOfCores = -1;
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if (s_numberOfCores > 0)
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return s_numberOfCores;
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if (const char* coresEnv = getenv("WTF_numberOfProcessorCores")) {
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unsigned numberOfCores;
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if (sscanf(coresEnv, "%u", &numberOfCores) == 1) {
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s_numberOfCores = numberOfCores;
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return s_numberOfCores;
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} else
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fprintf(stderr, "WARNING: failed to parse WTF_numberOfProcessorCores=%s\n", coresEnv);
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}
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#if OS(DARWIN)
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unsigned result;
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size_t length = sizeof(result);
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int name[] = {
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CTL_HW,
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HW_AVAILCPU
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};
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int sysctlResult = sysctl(name, sizeof(name) / sizeof(int), &result, &length, 0, 0);
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s_numberOfCores = sysctlResult < 0 ? defaultIfUnavailable : result;
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#elif OS(LINUX) || OS(AIX) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD)
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long sysconfResult = sysconf(_SC_NPROCESSORS_ONLN);
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s_numberOfCores = sysconfResult < 0 ? defaultIfUnavailable : static_cast<int>(sysconfResult);
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#elif OS(WINDOWS)
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UNUSED_PARAM(defaultIfUnavailable);
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SYSTEM_INFO sysInfo;
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GetSystemInfo(&sysInfo);
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s_numberOfCores = sysInfo.dwNumberOfProcessors;
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#else
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s_numberOfCores = defaultIfUnavailable;
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#endif
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return s_numberOfCores;
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}
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}
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