blob: 590d2d975c3ab7cbf7c5772f6fcc68222c8dcccf [file] [log] [blame]
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include "webrtc/system_wrappers/include/cpu_info.h"
#if defined(WEBRTC_WIN)
#include <winsock2.h>
#include <windows.h>
#ifndef EXCLUDE_D3D9
#include <d3d9.h>
#elif defined(WEBRTC_LINUX)
#include <unistd.h>
#if defined(WEBRTC_MAC)
#include <sys/sysctl.h>
#include "webrtc/rtc_base/logging.h"
namespace internal {
static int DetectNumberOfCores() {
// We fall back on assuming a single core in case of errors.
int number_of_cores = 1;
#if defined(WEBRTC_WIN)
number_of_cores = static_cast<int>(si.dwNumberOfProcessors);
#elif defined(WEBRTC_LINUX) || defined(WEBRTC_ANDROID)
number_of_cores = static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
#elif defined(WEBRTC_MAC)
int name[] = {CTL_HW, HW_AVAILCPU};
size_t size = sizeof(number_of_cores);
if (0 != sysctl(name, 2, &number_of_cores, &size, NULL, 0)) {
LOG(LS_ERROR) << "Failed to get number of cores";
number_of_cores = 1;
LOG(LS_ERROR) << "No function to get number of cores";
LOG(LS_INFO) << "Available number of cores: " << number_of_cores;
return number_of_cores;
namespace webrtc {
uint32_t CpuInfo::DetectNumberOfCores() {
// Statically cache the number of system cores available since if the process
// is running in a sandbox, we may only be able to read the value once (before
// the sandbox is initialized) and not thereafter.
// For more information see
static uint32_t logical_cpus = 0;
if (!logical_cpus)
logical_cpus = static_cast<uint32_t>(internal::DetectNumberOfCores());
return logical_cpus;
} // namespace webrtc