| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * 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. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef MOZC_BASE_CPU_STATS_H_ |
| #define MOZC_BASE_CPU_STATS_H_ |
| |
| #include "base/port.h" |
| |
| namespace mozc { |
| |
| class CPUStatsInterface { |
| public: |
| CPUStatsInterface() {} |
| virtual ~CPUStatsInterface() {} |
| |
| // returns the percentage of total CPU load since the last time |
| // this method was called. |
| // The return value must be in the range of [0.0 .. 1.0]. |
| virtual float GetSystemCPULoad() = 0; |
| |
| // returns the percentage of current process's CPU load |
| // since the last time this method was called. |
| // If the process has multi-threads, the return value |
| // may be larger than 1.0. |
| // Use GetNumberOfProcessors to normalize the CPU load by |
| // the number of processors. |
| virtual float GetCurrentProcessCPULoad() = 0; |
| |
| // returns the number of processors. |
| virtual size_t GetNumberOfProcessors() const = 0; |
| }; |
| |
| // default implementation |
| class CPUStats : public CPUStatsInterface { |
| public: |
| // return 0.0 if CPU load is unknown |
| float GetSystemCPULoad(); |
| |
| // return 0.0 if CPU load is unknown |
| float GetCurrentProcessCPULoad(); |
| |
| // return the number of processors |
| size_t GetNumberOfProcessors() const; |
| |
| CPUStats(); |
| virtual ~CPUStats(); |
| |
| private: |
| uint64 prev_system_total_times_; |
| uint64 prev_system_cpu_times_; |
| uint64 prev_current_process_total_times_; |
| uint64 prev_current_process_cpu_times_; |
| }; |
| } // namespace mozc |
| |
| #endif // MOZC_BASE_CPU_STATS_H_ |