Add GPowerProfileMonitor

1 files changed, 141 insertions, 0 deletions

diff --git a/gio/gpowerprofilemonitor.c b/gio/gpowerprofilemonitor.c
new file mode 100644
index 000000000..f5028b3e8
--- /dev/null
+++ b/gio/gpowerprofilemonitor.c
@@ -0,0 +1,141 @@
+/* GIO - GLib Input, Output and Streaming Library
+ *
+ * Copyright 2019 Red Hat, Inc
+ * Copyright 2021 Igalia S.L.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include "glib.h"
+#include "glibintl.h"
+
+#include "gpowerprofilemonitor.h"
+#include "ginetaddress.h"
+#include "ginetsocketaddress.h"
+#include "ginitable.h"
+#include "gioenumtypes.h"
+#include "giomodule-priv.h"
+#include "gtask.h"
+
+/**
+ * SECTION:gpowerprofilemonitor
+ * @title: GPowerProfileMonitor
+ * @short_description: Power profile monitor
+ * @include: gio/gio.h
+ *
+ * #GPowerProfileMonitor makes it possible for applications as well as OS components
+ * to monitor system power profiles and act upon them. It currently only exports
+ * whether the system is in “Power Saver” mode (known as “Low Power” mode on
+ * some systems).
+ *
+ * When in “Low Power” mode, it is recommended that applications:
+ * - disabling automatic downloads
+ * - reduce the rate of refresh from online sources such as calendar or
+ *   email synchronisation
+ * - if the application has expensive visual effects, reduce them
+ *
+ * It is also likely that OS components providing services to applications will
+ * lower their own background activity, for the sake of the system.
+ *
+ * There are a variety of tools that exist for power consumption analysis, but those
+ * usually depend on the OS and hardware used. On Linux, one could use `upower` to
+ * monitor the battery discharge rate, `powertop` to check on the background activity
+ * or activity at all), `sysprof` to inspect CPU usage, and `intel_gpu_time` to
+ * profile GPU usage.
+ *
+ * Don't forget to disconnect the #GPowerProfileMonitor::notify::power-saver-enabled
+ * signal, and unref the #GPowerProfileMonitor itself when exiting.
+ *
+ * Since: 2.70
+ */
+
+/**
+ * GPowerProfileMonitor:
+ *
+ * #GPowerProfileMonitor monitors system power profile and notifies on
+ * changes.
+ *
+ * Since: 2.70
+ */
+
+/**
+ * GPowerProfileMonitorInterface:
+ * @g_iface: The parent interface.
+ *
+ * The virtual function table for #GPowerProfileMonitor.
+ *
+ * Since: 2.70
+ */
+
+G_DEFINE_INTERFACE_WITH_CODE (GPowerProfileMonitor, g_power_profile_monitor, G_TYPE_OBJECT,
+                              g_type_interface_add_prerequisite (g_define_type_id, G_TYPE_INITABLE))
+
+
+/**
+ * g_power_profile_monitor_dup_default:
+ *
+ * Gets a reference to the default #GPowerProfileMonitor for the system.
+ *
+ * Returns: (not nullable) (transfer full): a new reference to the default #GPowerProfileMonitor
+ *
+ * Since: 2.70
+ */
+GPowerProfileMonitor *
+g_power_profile_monitor_dup_default (void)
+{
+  return g_object_ref (_g_io_module_get_default (G_POWER_PROFILE_MONITOR_EXTENSION_POINT_NAME,
+                                                 "GIO_USE_POWER_PROFILE_MONITOR",
+                                                 NULL));
+}
+
+/**
+ * g_power_profile_monitor_get_power_saver_enabled:
+ * @monitor: a #GPowerProfileMonitor
+ *
+ * Gets whether the system is in “Power Saver” mode.
+ *
+ * You are expected to listen to the
+ * #GPowerProfileMonitor::notify::power-saver-enabled signal to know when the profile has
+ * changed.
+ *
+ * Returns: Whether the system is in “Power Saver” mode.
+ *
+ * Since: 2.70
+ */
+gboolean
+g_power_profile_monitor_get_power_saver_enabled (GPowerProfileMonitor *monitor)
+{
+  gboolean enabled;
+  g_object_get (monitor, "power-saver-enabled", &enabled, NULL);
+  return enabled;
+}
+
+static void
+g_power_profile_monitor_default_init (GPowerProfileMonitorInterface *iface)
+{
+  /**
+   * GPowerProfileMonitor:power-saver-enabled:
+   *
+   * Whether “Power Saver” mode is enabled on the system.
+   *
+   * Since: 2.70
+   */
+  g_object_interface_install_property (iface,
+                                       g_param_spec_boolean ("power-saver-enabled",
+                                                             "power-saver-enabled",
+                                                             "Power Saver Enabled",
+                                                             FALSE,
+                                                             G_PARAM_READABLE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY));
+}