gio.MemoryMonitorT source code

1 /*
2  * This file is part of gtkD.
3  *
4  * gtkD is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU Lesser General Public License
6  * as published by the Free Software Foundation; either version 3
7  * of the License, or (at your option) any later version, with
8  * some exceptions, please read the COPYING file.
9  *
10  * gtkD is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with gtkD; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
18  */
19 
20 // generated automatically - do not change
21 // find conversion definition on APILookup.txt
22 // implement new conversion functionalities on the wrap.utils pakage
23 
24 
25 module gio.MemoryMonitorT;
26 
27 public  import gio.MemoryMonitorIF;
28 public  import gio.c.functions;
29 public  import gio.c.types;
30 public  import gobject.ObjectG;
31 public  import gobject.Signals;
32 public  import std.algorithm;
33 
34 
35 /**
36  * #GMemoryMonitor will monitor system memory and suggest to the application
37  * when to free memory so as to leave more room for other applications.
38  * It is implemented on Linux using the [Low Memory Monitor](https://gitlab.freedesktop.org/hadess/low-memory-monitor/)
39  * ([API documentation](https://hadess.pages.freedesktop.org/low-memory-monitor/)).
40  * 
41  * There is also an implementation for use inside Flatpak sandboxes.
42  * 
43  * Possible actions to take when the signal is received are:
44  * 
45  * - Free caches
46  * - Save files that haven't been looked at in a while to disk, ready to be reopened when needed
47  * - Run a garbage collection cycle
48  * - Try and compress fragmented allocations
49  * - Exit on idle if the process has no reason to stay around
50  * - Call [`malloc_trim(3)`](man:malloc_trim) to return cached heap pages to
51  * the kernel (if supported by your libc)
52  * 
53  * Note that some actions may not always improve system performance, and so
54  * should be profiled for your application. `malloc_trim()`, for example, may
55  * make future heap allocations slower (due to releasing cached heap pages back
56  * to the kernel).
57  * 
58  * See #GMemoryMonitorWarningLevel for details on the various warning levels.
59  * 
60  * |[<!-- language="C" -->
61  * static void
62  * warning_cb (GMemoryMonitor *m, GMemoryMonitorWarningLevel level)
63  * {
64  * g_debug ("Warning level: %d", level);
65  * if (warning_level > G_MEMORY_MONITOR_WARNING_LEVEL_LOW)
66  * drop_caches ();
67  * }
68  * 
69  * static GMemoryMonitor *
70  * monitor_low_memory (void)
71  * {
72  * GMemoryMonitor *m;
73  * m = g_memory_monitor_dup_default ();
74  * g_signal_connect (G_OBJECT (m), "low-memory-warning",
75  * G_CALLBACK (warning_cb), NULL);
76  * return m;
77  * }
78  * ]|
79  * 
80  * Don't forget to disconnect the #GMemoryMonitor::low-memory-warning
81  * signal, and unref the #GMemoryMonitor itself when exiting.
82  *
83  * Since: 2.64
84  */
85 public template MemoryMonitorT(TStruct)
86 {
87 	/** Get the main Gtk struct */
88 	public GMemoryMonitor* getMemoryMonitorStruct(bool transferOwnership = false)
89 	{
90 		if (transferOwnership)
91 			ownedRef = false;
92 		return cast(GMemoryMonitor*)getStruct();
93 	}
94 
95 
96 	/**
97 	 * Emitted when the system is running low on free memory. The signal
98 	 * handler should then take the appropriate action depending on the
99 	 * warning level. See the #GMemoryMonitorWarningLevel documentation for
100 	 * details.
101 	 *
102 	 * Params:
103 	 *     level = the #GMemoryMonitorWarningLevel warning level
104 	 *
105 	 * Since: 2.64
106 	 */
107 	gulong addOnLowMemoryWarning(void delegate(GMemoryMonitorWarningLevel, MemoryMonitorIF) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
108 	{
109 		return Signals.connect(this, "low-memory-warning", dlg, connectFlags ^ ConnectFlags.SWAPPED);
110 	}
111 }