Reland of Delete unused code from systeminfo.

webrtc/base/systeminfo.cc

-/*
- *  Copyright 2008 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/base/systeminfo.h"
-
-#if defined(WEBRTC_WIN)
-#include <winsock2.h>
-#include <windows.h>
-#ifndef EXCLUDE_D3D9
-#include <d3d9.h>
-#endif
-#include <intrin.h>  // for __cpuid()
-#elif defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
-#include <ApplicationServices/ApplicationServices.h>
-#include <CoreServices/CoreServices.h>
-#elif defined(WEBRTC_LINUX)
-#include <unistd.h>
-#endif
-#if defined(WEBRTC_MAC)
-#include <sys/sysctl.h>
-#endif
-
-#include "webrtc/base/basictypes.h"
-#include "webrtc/base/common.h"
-#include "webrtc/base/logging.h"
-#include "webrtc/base/stringutils.h"
-
-namespace rtc {
-
-// See Also: http://msdn.microsoft.com/en-us/library/ms683194(v=vs.85).aspx
-#if !defined(WEBRTC_WIN)
-// TODO(fbarchard): Use gcc 4.4 provided cpuid intrinsic
-// 32 bit fpic requires ebx be preserved
-#if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
-static inline void __cpuid(int cpu_info[4], int info_type) {
-  __asm__ volatile (  // NOLINT
-    "mov %%ebx, %%edi\n"
-    "cpuid\n"
-    "xchg %%edi, %%ebx\n"
-    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
-    : "a"(info_type)
-  );  // NOLINT
-}
-#elif defined(__i386__) || defined(__x86_64__)
-static inline void __cpuid(int cpu_info[4], int info_type) {
-  __asm__ volatile (  // NOLINT
-    "cpuid\n"
-    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
-    : "a"(info_type)
-  );  // NOLINT
-}
-#endif
-#endif  // WEBRTC_WIN
-
-static int DetectNumberOfCores() {
-  // We fall back on assuming a single core in case of errors.
-  int number_of_cores = 1;
-
-#if defined(WEBRTC_WIN)
-  SYSTEM_INFO si;
-  GetSystemInfo(&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));
-#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;
-  }
-#else
-  LOG(LS_ERROR) << "No function to get number of cores";
-#endif
-
-  LOG(LS_INFO) << "Available number of cores: " << number_of_cores;
-
-  return number_of_cores;
-}
-
-// 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.
-int SystemInfo::logical_cpus_ = 0;
-
-SystemInfo::SystemInfo() {
-}
-
-// Return the number of cpu threads available to the system.
-// static
-int SystemInfo::GetMaxCpus() {
-  if (!logical_cpus_)
-    logical_cpus_ = DetectNumberOfCores();
-  return logical_cpus_;
-}
-
-// Return the number of cpus available to the process.  Since affinity can be
-// changed on the fly, do not cache this value.
-// Can be affected by heat.
-int SystemInfo::GetCurCpus() {
-  int cur_cpus = 0;
-#if defined(WEBRTC_WIN)
-  DWORD_PTR process_mask = 0;
-  DWORD_PTR system_mask = 0;
-  ::GetProcessAffinityMask(::GetCurrentProcess(), &process_mask, &system_mask);
-  for (size_t i = 0; i < sizeof(DWORD_PTR) * 8; ++i) {
-    if (process_mask & 1)
-      ++cur_cpus;
-    process_mask >>= 1;
-  }
-#elif defined(WEBRTC_MAC)
-  uint32_t sysctl_value;
-  size_t length = sizeof(sysctl_value);
-  int error = sysctlbyname("hw.ncpu", &sysctl_value, &length, NULL, 0);
-  cur_cpus = !error ? static_cast<int>(sysctl_value) : 1;
-#else
-  // Linux, Solaris, WEBRTC_ANDROID
-  cur_cpus = GetMaxCpus();
-#endif
-  return cur_cpus;
-}
-
-// Return the type of this CPU.
-SystemInfo::Architecture SystemInfo::GetCpuArchitecture() {
-#if defined(__arm__) || defined(_M_ARM)
-  return SI_ARCH_ARM;
-#elif defined(__x86_64__) || defined(_M_X64)
-  return SI_ARCH_X64;
-#elif defined(__i386__) || defined(_M_IX86)
-  return SI_ARCH_X86;
-#else
-  return SI_ARCH_UNKNOWN;
-#endif
-}
-
-// Returns the vendor string from the cpu, e.g. "GenuineIntel", "AuthenticAMD".
-// See "Intel Processor Identification and the CPUID Instruction"
-// (Intel document number: 241618)
-std::string SystemInfo::GetCpuVendor() {
-#if defined(CPU_X86)
-  int cpu_info[4];
-  __cpuid(cpu_info, 0);
-  cpu_info[0] = cpu_info[1];  // Reorder output
-  cpu_info[1] = cpu_info[3];
-  // cpu_info[2] = cpu_info[2];  // Avoid -Werror=self-assign
-  cpu_info[3] = 0;
-  return std::string(reinterpret_cast<char*>(&cpu_info[0]));
-#elif defined(CPU_ARM)
-  return "ARM";
-#else
-  return "Undefined";
-#endif
-}
-
-// Returns the amount of installed physical memory in Bytes.  Cacheable.
-// Returns -1 on error.
-int64_t SystemInfo::GetMemorySize() {
-  int64_t memory = -1;
-
-#if defined(WEBRTC_WIN)
-  MEMORYSTATUSEX status = {0};
-  status.dwLength = sizeof(status);
-
-  if (GlobalMemoryStatusEx(&status)) {
-    memory = status.ullTotalPhys;
-  } else {
-    LOG_GLE(LS_WARNING) << "GlobalMemoryStatusEx failed.";
-  }
-
-#elif defined(WEBRTC_MAC)
-  size_t len = sizeof(memory);
-  int error = sysctlbyname("hw.memsize", &memory, &len, NULL, 0);
-  if (error || memory == 0)
-    memory = -1;
-#elif defined(WEBRTC_LINUX)
-  memory = static_cast<int64_t>(sysconf(_SC_PHYS_PAGES)) *
-           static_cast<int64_t>(sysconf(_SC_PAGESIZE));
-  if (memory < 0) {
-    LOG(LS_WARNING) << "sysconf(_SC_PHYS_PAGES) failed."
-                    << "sysconf(_SC_PHYS_PAGES) " << sysconf(_SC_PHYS_PAGES)
-                    << "sysconf(_SC_PAGESIZE) " << sysconf(_SC_PAGESIZE);
-    memory = -1;
-  }
-#endif
-
-  return memory;
-}
-
-// Return the name of the machine model we are currently running on.
-// This is a human readable string that consists of the name and version
-// number of the hardware, i.e 'MacBookAir1,1'. Returns an empty string if
-// model can not be determined.
-std::string SystemInfo::GetMachineModel() {
-#if defined(WEBRTC_MAC)
-  char buffer[128];
-  size_t length = sizeof(buffer);
-  int error = sysctlbyname("hw.model", buffer, &length, NULL, 0);
-  if (!error)
-    return std::string(buffer, length - 1);
-  return std::string();
-#else
-  return "Not available";
-#endif
-}
-
-}  // namespace rtc