henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2010 Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #ifndef TALK_BASE_CPUMONITOR_H_ |
| 29 | #define TALK_BASE_CPUMONITOR_H_ |
| 30 | |
| 31 | #include "talk/base/basictypes.h" |
| 32 | #include "talk/base/messagehandler.h" |
| 33 | #include "talk/base/scoped_ptr.h" |
| 34 | #include "talk/base/sigslot.h" |
| 35 | #if defined(LINUX) || defined(ANDROID) |
| 36 | #include "talk/base/stream.h" |
| 37 | #endif // defined(LINUX) || defined(ANDROID) |
| 38 | |
| 39 | namespace talk_base { |
| 40 | class Thread; |
| 41 | class SystemInfo; |
| 42 | |
| 43 | struct CpuStats { |
| 44 | CpuStats() |
| 45 | : prev_total_times_(0), |
| 46 | prev_cpu_times_(0), |
| 47 | prev_load_(0.f), |
| 48 | prev_load_time_(0u) { |
| 49 | } |
| 50 | |
| 51 | uint64 prev_total_times_; |
| 52 | uint64 prev_cpu_times_; |
| 53 | float prev_load_; // Previous load value. |
| 54 | uint32 prev_load_time_; // Time previous load value was taken. |
| 55 | }; |
| 56 | |
| 57 | // CpuSampler samples the process and system load. |
| 58 | class CpuSampler { |
| 59 | public: |
| 60 | CpuSampler(); |
| 61 | ~CpuSampler(); |
| 62 | |
| 63 | // Initialize CpuSampler. Returns true if successful. |
| 64 | bool Init(); |
| 65 | |
| 66 | // Set minimum interval in ms between computing new load values. |
| 67 | // Default 950 ms. Set to 0 to disable interval. |
| 68 | void set_load_interval(int min_load_interval); |
| 69 | |
| 70 | // Return CPU load of current process as a float from 0 to 1. |
| 71 | float GetProcessLoad(); |
| 72 | |
| 73 | // Return CPU load of current process as a float from 0 to 1. |
| 74 | float GetSystemLoad(); |
| 75 | |
| 76 | // Return number of cpus. Includes hyperthreads. |
| 77 | int GetMaxCpus() const; |
| 78 | |
| 79 | // Return current number of cpus available to this process. |
| 80 | int GetCurrentCpus(); |
| 81 | |
| 82 | // For testing. Allows forcing of fallback to using NTDLL functions. |
| 83 | void set_force_fallback(bool fallback) { |
| 84 | #ifdef WIN32 |
| 85 | force_fallback_ = fallback; |
| 86 | #endif |
| 87 | } |
| 88 | |
| 89 | private: |
| 90 | float UpdateCpuLoad(uint64 current_total_times, |
| 91 | uint64 current_cpu_times, |
| 92 | uint64 *prev_total_times, |
| 93 | uint64 *prev_cpu_times); |
| 94 | CpuStats process_; |
| 95 | CpuStats system_; |
| 96 | int cpus_; |
| 97 | int min_load_interval_; // Minimum time between computing new load. |
| 98 | scoped_ptr<SystemInfo> sysinfo_; |
| 99 | #ifdef WIN32 |
| 100 | void* get_system_times_; |
| 101 | void* nt_query_system_information_; |
| 102 | bool force_fallback_; |
| 103 | #endif |
| 104 | #if defined(LINUX) || defined(ANDROID) |
| 105 | // File for reading /proc/stat |
| 106 | scoped_ptr<FileStream> sfile_; |
| 107 | #endif // defined(LINUX) || defined(ANDROID) |
| 108 | }; |
| 109 | |
| 110 | // CpuMonitor samples and signals the CPU load periodically. |
| 111 | class CpuMonitor |
| 112 | : public talk_base::MessageHandler, public sigslot::has_slots<> { |
| 113 | public: |
| 114 | explicit CpuMonitor(Thread* thread); |
| 115 | virtual ~CpuMonitor(); |
| 116 | void set_thread(Thread* thread); |
| 117 | |
| 118 | bool Start(int period_ms); |
| 119 | void Stop(); |
| 120 | // Signal parameters are current cpus, max cpus, process load and system load. |
| 121 | sigslot::signal4<int, int, float, float> SignalUpdate; |
| 122 | |
| 123 | protected: |
| 124 | // Override virtual method of parent MessageHandler. |
| 125 | virtual void OnMessage(talk_base::Message* msg); |
| 126 | // Clear the monitor thread and stop sending it messages if the thread goes |
| 127 | // away before our lifetime. |
| 128 | void OnMessageQueueDestroyed() { monitor_thread_ = NULL; } |
| 129 | |
| 130 | private: |
| 131 | Thread* monitor_thread_; |
| 132 | CpuSampler sampler_; |
| 133 | int period_ms_; |
| 134 | |
| 135 | DISALLOW_COPY_AND_ASSIGN(CpuMonitor); |
| 136 | }; |
| 137 | |
| 138 | } // namespace talk_base |
| 139 | |
| 140 | #endif // TALK_BASE_CPUMONITOR_H_ |