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/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
#ifndef _GSM_SMOOTH_REFRESH_H
#define _GSM_SMOOTH_REFRESH_H
#include <giomm.h>
#include <glibmm.h>
#include <string>
#include "util.h"
using std::string;
class SmoothRefresh
: private procman::NonCopyable
{
public:
/*
smooth_refresh_new
@config_interval : pointer to config_interval so we can observe
config_interval changes.
@return : initialized SmoothRefresh
*/
SmoothRefresh(Glib::RefPtr<Gio::Settings> a_settings);
~SmoothRefresh();
/*
smooth_refresh_reset
Resets state and re-read config_interval
*/
void reset();
/*
smooth_refresh_get
Computes the new refresh_interval so that CPU usage is lower than
SMOOTH_REFRESH_PCPU.
@new_interval : where the new refresh_interval is stored.
@return : TRUE is refresh_interval has changed. The new refresh_interval
is stored in @new_interval. Else FALSE;
*/
bool get(guint &new_interval);
static const string KEY;
static const bool KEY_DEFAULT_VALUE;
private:
unsigned get_own_cpu_usage();
void load_settings_value(Glib::ustring key);
/*
fuzzy logic:
- decrease refresh interval only if current CPU% and last CPU%
are higher than PCPU_LO
- increase refresh interval only if current CPU% and last CPU%
are higher than PCPU_HI
*/
enum
{
PCPU_HI = 22,
PCPU_LO = 18
};
/*
-self : procman's PID (so we call getpid() only once)
-interval : current refresh interval
-config_interval : pointer to the configuration refresh interval.
Used to watch configuration changes
-interval >= -config_interval
-last_pcpu : to avoid spikes, the last CPU%. See PCPU_{LO,HI}
-last_total_time:
-last_cpu_time: Save last cpu and process times to compute CPU%
*/
Glib::RefPtr<Gio::Settings> settings;
bool active;
sigc::connection connection;
guint interval;
unsigned last_pcpu;
guint64 last_total_time;
guint64 last_cpu_time;
};
#endif /* _GSM_SMOOTH_REFRESH_H */
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