Allow Users To Modify Polling Rate

This patch allows users to modify how quickly sensors are polled.

One of the major features of Zen+ and newer processors is the ability
for them to perform gated sleeping on one or multiple cores at a time,
where power consumption of the gated core is "basically zero".

Since, by default, the application uses a polling rate of 300ms, the
power saving features of cores sleeping on Zen+ and newer is negated
when a sensor or MSR is probed often.

Allowing the users to modify the polling rate from between 50ms and
up to 60 seconds improves power saving by preventing cores from being
awoken multiple times a second when it isn't needed.

1 files changed, 81 insertions, 0 deletions

diff --git a/src/gui.c b/src/gui.c
index ba768d6..c15b115 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -1,5 +1,6 @@
 #include <cpuid.h>
 #include <gtk/gtk.h>
+#include <stdlib.h>
 #include "gui.h"
 #include "zenmonitor.h"
 
@@ -156,6 +157,79 @@ static void about_btn_clicked(GtkButton *button, gpointer user_data) {
     gtk_widget_destroy(dialog);
 }
 
+static GtkWidget* find_child(GtkWidget* parent, const gchar* name) {
+    GtkWidget *widget;
+    GList *children;
+
+    if (!strcmp(gtk_widget_get_name(parent), name))
+        return parent;
+
+    if (!GTK_IS_CONTAINER(parent))
+        return NULL;
+
+    children = gtk_container_get_children(GTK_CONTAINER(parent));
+
+    do {
+        widget = find_child(children->data, name);
+
+        if (widget != NULL)
+            return widget;
+    } while (children = g_list_next(children), children != NULL);
+
+    return NULL;
+}
+
+static void updaterate_dialog_response(GtkWidget* widget) {
+    GtkWidget *entry, *dialog;
+    const gchar *text;
+    guint val;
+
+    entry = find_child(widget, "update_interval");
+    text = gtk_entry_get_text(GTK_ENTRY (entry));
+
+    val = atoi(text);
+
+    if (val < 50 || val > 60000) {
+        dialog = gtk_message_dialog_new_with_markup(GTK_WINDOW (window),
+                GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
+                GTK_MESSAGE_INFO, GTK_BUTTONS_OK,
+                "<b>Invalid Update Rate</b>\n"
+                "Enter a value between 50 and 60000 milliseconds.");
+
+        gtk_dialog_run(GTK_DIALOG(dialog));
+        gtk_widget_destroy(dialog);
+        return;
+    }
+
+    g_source_remove(timeout);
+    timeout = g_timeout_add(val, update_data, NULL);
+
+    gtk_widget_destroy(widget);
+}
+
+static void urate_btn_clicked(GtkButton* button, gpointer user_data) {
+    GtkWidget *dialog, *entry, *hbox;
+
+    entry = gtk_entry_new();
+    gtk_entry_set_text(GTK_ENTRY (entry), "1000");
+    gtk_entry_set_max_length(GTK_ENTRY (entry), 6);
+    gtk_widget_set_name(entry, "update_interval");
+
+    hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 30);
+    gtk_box_pack_start(GTK_BOX (hbox), gtk_label_new("Update Interval (msec):"), 1, 1, 0);
+    gtk_box_pack_end(GTK_BOX (hbox), entry, 1, 1, 1);
+    gtk_box_set_center_widget(GTK_BOX (hbox), entry);
+
+    dialog = gtk_dialog_new_with_buttons ("Set Update Interval", GTK_WINDOW(window),
+        GTK_DIALOG_MODAL, "Apply", GTK_RESPONSE_OK, NULL);
+
+    g_signal_connect_swapped (GTK_DIALOG (dialog), "response",
+        G_CALLBACK (updaterate_dialog_response), dialog);
+    gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area(GTK_DIALOG (dialog))), hbox);
+
+    gtk_widget_show_all(dialog);
+}
+
 static void clear_btn_clicked(GtkButton *button, gpointer user_data) {
     SensorSource *source;
 
@@ -203,6 +277,7 @@ static void resize_to_treeview(GtkWindow* window, GtkTreeView* treeview) {
 }
 
 int start_gui (SensorSource *ss) {
+    GtkWidget *urate_btn;
     GtkWidget *about_btn;
     GtkWidget *clear_btn;
     GtkWidget *box;
@@ -226,6 +301,11 @@ int start_gui (SensorSource *ss) {
     box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
     gtk_style_context_add_class (gtk_widget_get_style_context (box), "linked");
 
+    urate_btn = gtk_button_new();
+    gtk_container_add(GTK_CONTAINER(urate_btn), gtk_image_new_from_icon_name("preferences-system", GTK_ICON_SIZE_BUTTON));
+    gtk_container_add(GTK_CONTAINER(box), urate_btn);
+    gtk_widget_set_tooltip_text(urate_btn, "Update polling rate");
+
     about_btn = gtk_button_new();
     gtk_container_add(GTK_CONTAINER(about_btn), gtk_image_new_from_icon_name("dialog-information", GTK_ICON_SIZE_BUTTON));
     gtk_container_add(GTK_CONTAINER(box), about_btn);
@@ -238,6 +318,7 @@ int start_gui (SensorSource *ss) {
 
     gtk_header_bar_pack_start(GTK_HEADER_BAR(header), box);
     g_signal_connect(about_btn, "clicked", G_CALLBACK(about_btn_clicked), NULL);
+    g_signal_connect(urate_btn, "clicked", G_CALLBACK(urate_btn_clicked), NULL);
     g_signal_connect(clear_btn, "clicked", G_CALLBACK(clear_btn_clicked), NULL);
     g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);