src/chrome/browser/extensions/api/system_cpu/cpu_info_provider_mac.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/extensions/api/system_cpu/cpu_info_provider.h"
   6
   7 #include <mach/mach_host.h>
   8
   9 #include "base/mac/scoped_mach_port.h"
  10 #include "base/sys_info.h"
  11
  12 namespace extensions {
  13
  14 bool CpuInfoProvider::QueryCpuTimePerProcessor(
  15     std::vector<linked_ptr<api::system_cpu::ProcessorInfo> >* infos) {
  16   DCHECK(infos);
  17
  18   natural_t num_of_processors;
  19   base::mac::ScopedMachPort host(mach_host_self());
  20   mach_msg_type_number_t type;
  21   processor_cpu_load_info_data_t* cpu_infos;
  22
  23   if (host_processor_info(host.get(),
  24                           PROCESSOR_CPU_LOAD_INFO,
  25                           &num_of_processors,
  26                           reinterpret_cast<processor_info_array_t*>(&cpu_infos),
  27                           &type) == KERN_SUCCESS) {
  28     DCHECK_EQ(num_of_processors,
  29         static_cast<natural_t>(base::SysInfo::NumberOfProcessors()));
  30     DCHECK_EQ(num_of_processors, static_cast<natural_t>(infos->size()));
  31
  32     for (natural_t i = 0; i < num_of_processors; ++i) {
  33       double user = static_cast<double>(cpu_infos[i].cpu_ticks[CPU_STATE_USER]),
  34           sys = static_cast<double>(cpu_infos[i].cpu_ticks[CPU_STATE_SYSTEM]),
  35           nice = static_cast<double>(cpu_infos[i].cpu_ticks[CPU_STATE_NICE]),
  36           idle = static_cast<double>(cpu_infos[i].cpu_ticks[CPU_STATE_IDLE]);
  37
  38       infos->at(i)->usage.kernel = sys;
  39       infos->at(i)->usage.user = user + nice;
  40       infos->at(i)->usage.idle = idle;
  41       infos->at(i)->usage.total = sys + user + nice + idle;
  42     }
  43
  44     vm_deallocate(mach_task_self(),
  45                   reinterpret_cast<vm_address_t>(cpu_infos),
  46                   num_of_processors * sizeof(processor_cpu_load_info));
  47
  48     return true;
  49   }
  50
  51   return false;
  52 }
  53
  54 }  // namespace extensions