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/*
* Copyright (c) 2025 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 "rtc_base/cpu_info.h"
#include <cstdint>
#if defined(WEBRTC_WIN)
#include <windows.h>
#elif defined(WEBRTC_LINUX)
#include <unistd.h>
#elif defined(WEBRTC_MAC)
#include <sys/sysctl.h>
#elif defined(WEBRTC_FUCHSIA)
#include <zircon/syscalls.h>
#endif
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace {
uint32_t DetectNumberOfCores() {
int number_of_cores = 0;
#if defined(WEBRTC_WIN)
SYSTEM_INFO si;
GetNativeSystemInfo(&si);
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));
if (number_of_cores <= 0) {
RTC_LOG(LS_ERROR) << "Failed to get number of cores";
number_of_cores = 1;
}
#elif defined(WEBRTC_MAC) || defined(WEBRTC_IOS)
int name[] = {CTL_HW, HW_AVAILCPU};
size_t size = sizeof(number_of_cores);
if (0 != sysctl(name, 2, &number_of_cores, &size, NULL, 0)) {
RTC_LOG(LS_ERROR) << "Failed to get number of cores";
number_of_cores = 1;
}
#elif defined(WEBRTC_FUCHSIA)
number_of_cores = zx_system_get_num_cpus();
#else
RTC_LOG(LS_ERROR) << "No function to get number of cores";
number_of_cores = 1;
#endif
RTC_LOG(LS_INFO) << "Available number of cores: " << number_of_cores;
RTC_CHECK_GT(number_of_cores, 0);
return static_cast<uint32_t>(number_of_cores);
}
} // namespace
namespace webrtc {
namespace cpu_info {
uint32_t 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 crbug.com/176522.
static const uint32_t logical_cpus = ::DetectNumberOfCores();
return logical_cpus;
}
} // namespace cpu_info
} // namespace webrtc
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