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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright 2025 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 "gcancellable.h"
#include "ginitable.h"
#include "gioerror.h"
#include "giomodule-priv.h"
#include "glib/gstdio.h"
#include "glibintl.h"
#include "gmemorymonitor.h"
#include "gmemorymonitorbase.h"
#ifdef HAVE_SYSINFO
#include <sys/sysinfo.h>
#elif defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
/**
* GMemoryMonitorBase:
*
* An abstract base class for implementations of [iface@Gio.MemoryMonitor] which
* provides several defined warning levels (`GLowMemoryLevel`) and tracks how
* often they are notified to the user via [signal@Gio.MemoryMonitor::low-memory-warning]
* to limit the number of signal emissions to one every 15 seconds for each level.
* [method@Gio.MemoryMonitorBase.send_event_to_user] is provided for this purpose.
*/
/* The interval between sending a signal in second */
#define RECOVERY_INTERVAL_SEC 15
#define G_MEMORY_MONITOR_BASE_GET_INITABLE_IFACE(o) (G_TYPE_INSTANCE_GET_INTERFACE ((o), G_TYPE_INITABLE, GInitable))
static void g_memory_monitor_base_iface_init (GMemoryMonitorInterface *iface);
static void g_memory_monitor_base_initable_iface_init (GInitableIface *iface);
typedef struct
{
GObject parent_instance;
guint64 last_trigger_us[G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_COUNT];
} GMemoryMonitorBasePrivate;
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GMemoryMonitorBase, g_memory_monitor_base, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
g_memory_monitor_base_initable_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_MEMORY_MONITOR,
g_memory_monitor_base_iface_init)
G_ADD_PRIVATE (GMemoryMonitorBase))
gdouble
g_memory_monitor_base_query_mem_ratio (void)
{
#ifdef HAVE_SYSINFO
struct sysinfo info;
if (sysinfo (&info))
return -1.0;
if (info.totalram == 0)
return -1.0;
return (gdouble) ((gdouble) info.freeram / (gdouble) info.totalram);
#elif defined(_SC_PHYS_PAGES) && defined(_SC_AVPHYS_PAGES)
/* Implementation for Solaris, where sysinfo() does not return RAM usage information */
long totalram = sysconf (_SC_PHYS_PAGES);
long freeram = sysconf (_SC_AVPHYS_PAGES);
if (totalram <= 0 || freeram < 0)
return -1.0;
return (gdouble) ((gdouble) freeram / (gdouble) totalram);
#else
return -1.0;
#endif
}
GMemoryMonitorWarningLevel
g_memory_monitor_base_level_enum_to_byte (GMemoryMonitorLowMemoryLevel level)
{
const GMemoryMonitorWarningLevel level_bytes[G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_COUNT] = {
[G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_LOW] = 50,
[G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_MEDIUM] = 100,
[G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_CRITICAL] = 255
};
if ((int) level < G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_INVALID ||
(int) level >= G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_COUNT)
g_assert_not_reached ();
if (level == G_MEMORY_MONITOR_LOW_MEMORY_LEVEL_INVALID)
return 0;
return level_bytes[level];
}
typedef struct
{
GWeakRef monitor_weak;
GMemoryMonitorWarningLevel level;
} SendEventData;
static void
send_event_data_free (SendEventData *data)
{
g_weak_ref_clear (&data->monitor_weak);
g_free (data);
}
/* Invoked in the global default main context */
static gboolean
send_event_cb (void *user_data)
{
SendEventData *data = user_data;
GMemoryMonitor *monitor = g_weak_ref_get (&data->monitor_weak);
if (monitor != NULL)
g_signal_emit_by_name (monitor, "low-memory-warning", data->level);
g_clear_object (&monitor);
return G_SOURCE_REMOVE;
}
void
g_memory_monitor_base_send_event_to_user (GMemoryMonitorBase *monitor,
GMemoryMonitorLowMemoryLevel warning_level)
{
gint64 current_time;
GMemoryMonitorBasePrivate *priv = g_memory_monitor_base_get_instance_private (monitor);
current_time = g_get_monotonic_time ();
if (priv->last_trigger_us[warning_level] == 0 ||
(current_time - priv->last_trigger_us[warning_level]) > (RECOVERY_INTERVAL_SEC * G_USEC_PER_SEC))
{
SendEventData *data = NULL;
g_debug ("Send low memory signal with warning level %u", warning_level);
/* The signal has to be emitted in the global default main context,
* because the `GMemoryMonitor` is a singleton which may have been created
* in an arbitrary thread, or which may be calling this function from the
* GLib worker thread. */
data = g_new0 (SendEventData, 1);
g_weak_ref_init (&data->monitor_weak, monitor);
data->level = g_memory_monitor_base_level_enum_to_byte (warning_level);
g_main_context_invoke_full (NULL, G_PRIORITY_DEFAULT, send_event_cb,
g_steal_pointer (&data), (GDestroyNotify) send_event_data_free);
priv->last_trigger_us[warning_level] = current_time;
}
}
static gboolean
g_memory_monitor_base_initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
return TRUE;
}
static void
g_memory_monitor_base_init (GMemoryMonitorBase *monitor)
{
}
static void
g_memory_monitor_base_class_init (GMemoryMonitorBaseClass *klass)
{
}
static void
g_memory_monitor_base_iface_init (GMemoryMonitorInterface *monitor_iface)
{
}
static void
g_memory_monitor_base_initable_iface_init (GInitableIface *iface)
{
iface->init = g_memory_monitor_base_initable_init;
}
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