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 { CpuStatsCpuStats27 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. set_force_fallback(bool fallback)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 virtual ~CpuMonitor(); 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 virtual void OnMessage(rtc::Message* msg); 109 // Clear the monitor thread and stop sending it messages if the thread goes 110 // away before our lifetime. OnMessageQueueDestroyed()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_ 124