1 files changed, 104 insertions, 0 deletions
diff --git a/src/smooth_refresh.h b/src/smooth_refresh.h
new file mode 100644
index 0000000..29a503f
--- /dev/null
+++ b/src/smooth_refresh.h
@@ -0,0 +1,104 @@
+#ifndef _PROCMAN_SMOOTH_REFRESH
+#define _PROCMAN_SMOOTH_REFRESH
+
+#include <glib.h>
+#include <mateconf/mateconf-client.h>
+
+#include <string>
+
+using std::string;
+
+
+
+class SmoothRefresh
+{
+public:
+
+  /*
+    smooth_refresh_new
+
+    @config_interval : pointer to config_interval so we can observe
+    config_interval changes.
+
+    @return : initialized SmoothRefresh
+  */
+  SmoothRefresh();
+
+  ~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();
+
+  static void status_changed(MateConfClient *client,
+			     guint cnxn_id,
+			     MateConfEntry *entry,
+			     gpointer user_data);
+
+  void load_mateconf_value(MateConfValue* value = NULL);
+
+  /*
+    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%
+  */
+
+  bool active;
+  guint connection;
+  guint interval;
+  unsigned  last_pcpu;
+  guint64 last_total_time;
+  guint64 last_cpu_time;
+};
+
+
+#endif /* _PROCMAN_SMOOTH_REFRESH */