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* Copyright 2010 Google Inc.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef TALK_BASE_CPUMONITOR_H_
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#define TALK_BASE_CPUMONITOR_H_
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#include "talk/base/basictypes.h"
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#include "talk/base/messagehandler.h"
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#include "talk/base/scoped_ptr.h"
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#include "talk/base/sigslot.h"
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#if defined(LINUX) || defined(ANDROID)
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#include "talk/base/stream.h"
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#endif // defined(LINUX) || defined(ANDROID)
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: prev_total_times_(0),
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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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// CpuSampler samples the process and system load.
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// Initialize CpuSampler. Returns true if successful.
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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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// For testing. Allows forcing of fallback to using NTDLL functions.
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void set_force_fallback(bool fallback) {
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force_fallback_ = fallback;
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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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int min_load_interval_; // Minimum time between computing new load.
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scoped_ptr<SystemInfo> sysinfo_;
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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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#if defined(LINUX) || defined(ANDROID)
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// File for reading /proc/stat
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scoped_ptr<FileStream> sfile_;
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#endif // defined(LINUX) || defined(ANDROID)
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// CpuMonitor samples and signals the CPU load periodically.
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: public talk_base::MessageHandler, public sigslot::has_slots<> {
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explicit CpuMonitor(Thread* thread);
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virtual ~CpuMonitor();
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bool Start(int period_ms);
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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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// Override virtual method of parent MessageHandler.
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virtual void OnMessage(talk_base::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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Thread* monitor_thread_;
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DISALLOW_COPY_AND_ASSIGN(CpuMonitor);
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} // namespace talk_base
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#endif // TALK_BASE_CPUMONITOR_H_