henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 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 | 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. |
| 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_ |