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/*
* Copyright (C) 2012 University of Szeged. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/NumberOfCores.h>
#include <cstdio>
#include <mutex>
#if OS(DARWIN)
#include <sys/sysctl.h>
#elif OS(LINUX) || OS(AIX) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD) || OS(HAIKU)
#include <unistd.h>
#elif OS(WINDOWS)
#include <windows.h>
#endif
namespace WTF {
int numberOfProcessorCores()
{
const int defaultIfUnavailable = 1;
static int s_numberOfCores = -1;
if (s_numberOfCores > 0)
return s_numberOfCores;
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
if (const char* coresEnv = getenv("WTF_numberOfProcessorCores")) {
unsigned numberOfCores;
if (sscanf(coresEnv, "%u", &numberOfCores) == 1) {
s_numberOfCores = numberOfCores;
return s_numberOfCores;
} else
fprintf(stderr, "WARNING: failed to parse WTF_numberOfProcessorCores=%s\n", coresEnv);
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#if OS(DARWIN)
unsigned result;
size_t length = sizeof(result);
int name[] = {
CTL_HW,
HW_AVAILCPU
};
int sysctlResult = sysctl(name, sizeof(name) / sizeof(int), &result, &length, 0, 0);
s_numberOfCores = sysctlResult < 0 ? defaultIfUnavailable : result;
#elif OS(LINUX) || OS(AIX) || OS(OPENBSD) || OS(NETBSD) || OS(FREEBSD) || OS(HAIKU)
long sysconfResult = sysconf(_SC_NPROCESSORS_ONLN);
s_numberOfCores = sysconfResult < 0 ? defaultIfUnavailable : static_cast<int>(sysconfResult);
#elif OS(WINDOWS)
UNUSED_PARAM(defaultIfUnavailable);
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
s_numberOfCores = sysInfo.dwNumberOfProcessors;
#else
s_numberOfCores = defaultIfUnavailable;
#endif
return s_numberOfCores;
}
#if OS(DARWIN)
int numberOfPhysicalProcessorCores()
{
const int32_t defaultIfUnavailable = 1;
static int32_t numCores = 0;
static std::once_flag onceKey;
std::call_once(onceKey, [&] {
size_t valueSize = sizeof(numCores);
int result = sysctlbyname("hw.physicalcpu_max", &numCores, &valueSize, nullptr, 0);
if (result < 0)
numCores = defaultIfUnavailable;
});
return numCores;
}
#endif
}
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