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| 1 /* |
| 2 * Copyright 2010 The WebRTC Project Authors. All rights reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_BASE_CPUMONITOR_H_ |
| 12 #define WEBRTC_BASE_CPUMONITOR_H_ |
| 13 |
| 14 #include "webrtc/base/basictypes.h" |
| 15 #include "webrtc/base/messagehandler.h" |
| 16 #include "webrtc/base/scoped_ptr.h" |
| 17 #include "webrtc/base/sigslot.h" |
| 18 #if defined(WEBRTC_LINUX) |
| 19 #include "webrtc/base/stream.h" |
| 20 #endif // defined(WEBRTC_LINUX) |
| 21 |
| 22 namespace rtc { |
| 23 class Thread; |
| 24 class SystemInfo; |
| 25 |
| 26 struct CpuStats { |
| 27 CpuStats() |
| 28 : prev_total_times_(0), |
| 29 prev_cpu_times_(0), |
| 30 prev_load_(0.f), |
| 31 prev_load_time_(0u) { |
| 32 } |
| 33 |
| 34 uint64 prev_total_times_; |
| 35 uint64 prev_cpu_times_; |
| 36 float prev_load_; // Previous load value. |
| 37 uint32 prev_load_time_; // Time previous load value was taken. |
| 38 }; |
| 39 |
| 40 // CpuSampler samples the process and system load. |
| 41 class CpuSampler { |
| 42 public: |
| 43 CpuSampler(); |
| 44 ~CpuSampler(); |
| 45 |
| 46 // Initialize CpuSampler. Returns true if successful. |
| 47 bool Init(); |
| 48 |
| 49 // Set minimum interval in ms between computing new load values. |
| 50 // Default 950 ms. Set to 0 to disable interval. |
| 51 void set_load_interval(int min_load_interval); |
| 52 |
| 53 // Return CPU load of current process as a float from 0 to 1. |
| 54 float GetProcessLoad(); |
| 55 |
| 56 // Return CPU load of current process as a float from 0 to 1. |
| 57 float GetSystemLoad(); |
| 58 |
| 59 // Return number of cpus. Includes hyperthreads. |
| 60 int GetMaxCpus() const; |
| 61 |
| 62 // Return current number of cpus available to this process. |
| 63 int GetCurrentCpus(); |
| 64 |
| 65 // For testing. Allows forcing of fallback to using NTDLL functions. |
| 66 void set_force_fallback(bool fallback) { |
| 67 #if defined(WEBRTC_WIN) |
| 68 force_fallback_ = fallback; |
| 69 #endif |
| 70 } |
| 71 |
| 72 private: |
| 73 float UpdateCpuLoad(uint64 current_total_times, |
| 74 uint64 current_cpu_times, |
| 75 uint64 *prev_total_times, |
| 76 uint64 *prev_cpu_times); |
| 77 CpuStats process_; |
| 78 CpuStats system_; |
| 79 int cpus_; |
| 80 int min_load_interval_; // Minimum time between computing new load. |
| 81 scoped_ptr<SystemInfo> sysinfo_; |
| 82 #if defined(WEBRTC_WIN) |
| 83 void* get_system_times_; |
| 84 void* nt_query_system_information_; |
| 85 bool force_fallback_; |
| 86 #endif |
| 87 #if defined(WEBRTC_LINUX) |
| 88 // File for reading /proc/stat |
| 89 scoped_ptr<FileStream> sfile_; |
| 90 #endif // defined(WEBRTC_LINUX) |
| 91 }; |
| 92 |
| 93 // CpuMonitor samples and signals the CPU load periodically. |
| 94 class CpuMonitor |
| 95 : public rtc::MessageHandler, public sigslot::has_slots<> { |
| 96 public: |
| 97 explicit CpuMonitor(Thread* thread); |
| 98 ~CpuMonitor() override; |
| 99 void set_thread(Thread* thread); |
| 100 |
| 101 bool Start(int period_ms); |
| 102 void Stop(); |
| 103 // Signal parameters are current cpus, max cpus, process load and system load. |
| 104 sigslot::signal4<int, int, float, float> SignalUpdate; |
| 105 |
| 106 protected: |
| 107 // Override virtual method of parent MessageHandler. |
| 108 void OnMessage(rtc::Message* msg) override; |
| 109 // Clear the monitor thread and stop sending it messages if the thread goes |
| 110 // away before our lifetime. |
| 111 void OnMessageQueueDestroyed() { monitor_thread_ = NULL; } |
| 112 |
| 113 private: |
| 114 Thread* monitor_thread_; |
| 115 CpuSampler sampler_; |
| 116 int period_ms_; |
| 117 |
| 118 DISALLOW_COPY_AND_ASSIGN(CpuMonitor); |
| 119 }; |
| 120 |
| 121 } // namespace rtc |
| 122 |
| 123 #endif // WEBRTC_BASE_CPUMONITOR_H_ |
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