f048872e91
migrating talk/base to webrtc/base. BUG=N/A R=niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/17479005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6129 4adac7df-926f-26a2-2b94-8c16560cd09d
124 lines
3.4 KiB
C++
124 lines
3.4 KiB
C++
/*
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* Copyright 2010 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_CPUMONITOR_H_
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#define WEBRTC_BASE_CPUMONITOR_H_
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#include "webrtc/base/basictypes.h"
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#include "webrtc/base/messagehandler.h"
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#include "webrtc/base/scoped_ptr.h"
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#include "webrtc/base/sigslot.h"
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#if defined(WEBRTC_LINUX)
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#include "webrtc/base/stream.h"
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#endif // defined(WEBRTC_LINUX)
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namespace rtc {
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class Thread;
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class SystemInfo;
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struct CpuStats {
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CpuStats()
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: prev_total_times_(0),
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prev_cpu_times_(0),
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prev_load_(0.f),
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prev_load_time_(0u) {
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}
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uint64 prev_total_times_;
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uint64 prev_cpu_times_;
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float prev_load_; // Previous load value.
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uint32 prev_load_time_; // Time previous load value was taken.
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};
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// CpuSampler samples the process and system load.
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class CpuSampler {
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public:
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CpuSampler();
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~CpuSampler();
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// Initialize CpuSampler. Returns true if successful.
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bool Init();
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// Set minimum interval in ms between computing new load values.
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// Default 950 ms. Set to 0 to disable interval.
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void set_load_interval(int min_load_interval);
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// Return CPU load of current process as a float from 0 to 1.
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float GetProcessLoad();
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// Return CPU load of current process as a float from 0 to 1.
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float GetSystemLoad();
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// Return number of cpus. Includes hyperthreads.
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int GetMaxCpus() const;
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// Return current number of cpus available to this process.
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int GetCurrentCpus();
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// For testing. Allows forcing of fallback to using NTDLL functions.
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void set_force_fallback(bool fallback) {
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#if defined(WEBRTC_WIN)
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force_fallback_ = fallback;
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#endif
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}
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private:
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float UpdateCpuLoad(uint64 current_total_times,
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uint64 current_cpu_times,
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uint64 *prev_total_times,
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uint64 *prev_cpu_times);
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CpuStats process_;
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CpuStats system_;
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int cpus_;
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int min_load_interval_; // Minimum time between computing new load.
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scoped_ptr<SystemInfo> sysinfo_;
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#if defined(WEBRTC_WIN)
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void* get_system_times_;
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void* nt_query_system_information_;
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bool force_fallback_;
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#endif
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#if defined(WEBRTC_LINUX)
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// File for reading /proc/stat
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scoped_ptr<FileStream> sfile_;
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#endif // defined(WEBRTC_LINUX)
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};
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// CpuMonitor samples and signals the CPU load periodically.
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class CpuMonitor
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: public rtc::MessageHandler, public sigslot::has_slots<> {
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public:
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explicit CpuMonitor(Thread* thread);
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virtual ~CpuMonitor();
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void set_thread(Thread* thread);
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bool Start(int period_ms);
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void Stop();
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// Signal parameters are current cpus, max cpus, process load and system load.
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sigslot::signal4<int, int, float, float> SignalUpdate;
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protected:
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// Override virtual method of parent MessageHandler.
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virtual void OnMessage(rtc::Message* msg);
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// Clear the monitor thread and stop sending it messages if the thread goes
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// away before our lifetime.
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void OnMessageQueueDestroyed() { monitor_thread_ = NULL; }
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private:
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Thread* monitor_thread_;
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CpuSampler sampler_;
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int period_ms_;
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DISALLOW_COPY_AND_ASSIGN(CpuMonitor);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_CPUMONITOR_H_
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