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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>GMemoryMonitor: GIO Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GIO Reference Manual"> <link rel="up" href="application.html" title="Application support"> <link rel="prev" href="GDBusActionGroup.html" title="GDBusActionGroup"> <link rel="next" href="GMenuModel.html" title="GMenuModel"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#GMemoryMonitor.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GMemoryMonitor.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_prerequisites"> <span class="dim">|</span> <a href="#GMemoryMonitor.prerequisites" class="shortcut">Prerequisites</a></span><span id="nav_signals"> <span class="dim">|</span> <a href="#GMemoryMonitor.signals" class="shortcut">Signals</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="application.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="GDBusActionGroup.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GMenuModel.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="GMemoryMonitor"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="GMemoryMonitor.top_of_page"></a>GMemoryMonitor</span></h2> <p>GMemoryMonitor — Memory usage monitor</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="GMemoryMonitor.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody><tr> <td class="function_type"> <a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="returnvalue">GMemoryMonitor</span></a> * </td> <td class="function_name"> <a class="link" href="GMemoryMonitor.html#g-memory-monitor-dup-default" title="g_memory_monitor_dup_default ()">g_memory_monitor_dup_default</a> <span class="c_punctuation">()</span> </td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GMemoryMonitor.signals"></a><h2>Signals</h2> <div class="informaltable"><table class="informaltable" border="0"> <colgroup> <col width="150px" class="signal_proto_type"> <col width="300px" class="signal_proto_name"> <col width="200px" class="signal_proto_flags"> </colgroup> <tbody><tr> <td class="signal_type"><span class="returnvalue">void</span></td> <td class="signal_name"><a class="link" href="GMemoryMonitor.html#GMemoryMonitor-low-memory-warning" title="The “low-memory-warning” signal">low-memory-warning</a></td> <td class="signal_flags">Run Last</td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GMemoryMonitor.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody> <tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="GMemoryMonitor.html#GMemoryMonitor-struct" title="GMemoryMonitor">GMemoryMonitor</a></td> </tr> <tr> <td class="datatype_keyword">struct</td> <td class="function_name"><a class="link" href="GMemoryMonitor.html#GMemoryMonitorInterface" title="struct GMemoryMonitorInterface">GMemoryMonitorInterface</a></td> </tr> <tr> <td class="datatype_keyword">enum</td> <td class="function_name"><a class="link" href="GMemoryMonitor.html#GMemoryMonitorWarningLevel" title="enum GMemoryMonitorWarningLevel">GMemoryMonitorWarningLevel</a></td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"><a class="link" href="GMemoryMonitor.html#G-MEMORY-MONITOR-EXTENSION-POINT-NAME:CAPS" title="G_MEMORY_MONITOR_EXTENSION_POINT_NAME">G_MEMORY_MONITOR_EXTENSION_POINT_NAME</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GMemoryMonitor.object-hierarchy"></a><h2>Object Hierarchy</h2> <pre class="screen"> GEnum <span class="lineart">╰──</span> GMemoryMonitorWarningLevel GInterface <span class="lineart">╰──</span> GMemoryMonitor </pre> </div> <div class="refsect1"> <a name="GMemoryMonitor.prerequisites"></a><h2>Prerequisites</h2> <p> GMemoryMonitor requires <a class="link" href="GInitable.html" title="GInitable">GInitable</a> and GObject.</p> </div> <div class="refsect1"> <a name="GMemoryMonitor.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gio/gio.h> </pre> </div> <div class="refsect1"> <a name="GMemoryMonitor.description"></a><h2>Description</h2> <p><a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a> will monitor system memory and suggest to the application when to free memory so as to leave more room for other applications. It is implemented on Linux using the <a class="ulink" href="https://gitlab.freedesktop.org/hadess/low-memory-monitor/" target="_top">Low Memory Monitor</a> (<a class="ulink" href="https://hadess.pages.freedesktop.org/low-memory-monitor/" target="_top">API documentation</a>).</p> <p>There is also an implementation for use inside Flatpak sandboxes.</p> <p>Possible actions to take when the signal is received are:</p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><p>Free caches</p></li> <li class="listitem"><p>Save files that haven't been looked at in a while to disk, ready to be reopened when needed</p></li> <li class="listitem"><p>Run a garbage collection cycle</p></li> <li class="listitem"><p>Try and compress fragmented allocations</p></li> <li class="listitem"><p>Exit on idle if the process has no reason to stay around</p></li> </ul></div> <p>See <a class="link" href="GMemoryMonitor.html#GMemoryMonitorWarningLevel" title="enum GMemoryMonitorWarningLevel"><span class="type">GMemoryMonitorWarningLevel</span></a> for details on the various warning levels.</p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17</pre></td> <td class="listing_code"><pre class="programlisting"><span class="k">static</span> <span class="kt">void</span> <span class="nf">warning_cb</span> <span class="p">(</span><span class="n">GMemoryMonitor</span> <span class="o">*</span><span class="n">m</span><span class="p">,</span> <span class="n">GMemoryMonitorWarningLevel</span> <span class="n">level</span><span class="p">)</span> <span class="p">{</span> <span class="n">g_debug</span> <span class="p">(</span><span class="s">"Warning level: %d"</span><span class="p">,</span> <span class="n">level</span><span class="p">);</span> <span class="k">if</span> <span class="p">(</span><span class="n">warning_level</span> <span class="o">></span> <span class="n">G_MEMORY_MONITOR_WARNING_LEVEL_LOW</span><span class="p">)</span> <span class="n">drop_caches</span> <span class="p">();</span> <span class="p">}</span> <span class="k">static</span> <span class="n">GMemoryMonitor</span> <span class="o">*</span> <span class="nf">monitor_low_memory</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="p">{</span> <span class="n">GMemoryMonitor</span> <span class="o">*</span><span class="n">m</span><span class="p">;</span> <span class="n">m</span> <span class="o">=</span> <span class="n">g_memory_monitor_dup_default</span> <span class="p">();</span> <span class="n">g_signal_connect</span> <span class="p">(</span><span class="n">G_OBJECT</span> <span class="p">(</span><span class="n">m</span><span class="p">),</span> <span class="s">"low-memory-warning"</span><span class="p">,</span> <span class="n">G_CALLBACK</span> <span class="p">(</span><span class="n">warning_cb</span><span class="p">),</span> <span class="nb">NULL</span><span class="p">);</span> <span class="k">return</span> <span class="n">m</span><span class="p">;</span> <span class="p">}</span></pre></td> </tr> </tbody> </table> </div> <p></p> <p>Don't forget to disconnect the <a class="link" href="GMemoryMonitor.html#GMemoryMonitor-low-memory-warning" title="The “low-memory-warning” signal"><span class="type">“low-memory-warning”</span></a> signal, and unref the <a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a> itself when exiting.</p> </div> <div class="refsect1"> <a name="GMemoryMonitor.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-memory-monitor-dup-default"></a><h3>g_memory_monitor_dup_default ()</h3> <pre class="programlisting"><a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="returnvalue">GMemoryMonitor</span></a> * g_memory_monitor_dup_default (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Gets a reference to the default <a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a> for the system.</p> <div class="refsect3"> <a name="g-memory-monitor-dup-default.returns"></a><h4>Returns</h4> <p>a new reference to the default <a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a>. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> <p class="since">Since: <a class="link" href="api-index-2-64.html#api-index-2.64">2.64</a></p> </div> </div> <div class="refsect1"> <a name="GMemoryMonitor.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GMemoryMonitor-struct"></a><h3>GMemoryMonitor</h3> <pre class="programlisting">typedef struct _GMemoryMonitor GMemoryMonitor;</pre> <p><a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a> monitors system memory and indicates when the system is low on memory.</p> <p class="since">Since: <a class="link" href="api-index-2-64.html#api-index-2.64">2.64</a></p> </div> <hr> <div class="refsect2"> <a name="GMemoryMonitorInterface"></a><h3>struct GMemoryMonitorInterface</h3> <pre class="programlisting">struct GMemoryMonitorInterface { void (*low_memory_warning) (GMemoryMonitor *monitor, GMemoryMonitorWarningLevel level); }; </pre> <p>The virtual function table for <a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a>.</p> <div class="refsect3"> <a name="GMemoryMonitorInterface.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="struct_members_name"> <col class="struct_members_description"> <col width="200px" class="struct_members_annotations"> </colgroup> <tbody><tr> <td class="struct_member_name"><p><em class="structfield"><code><a name="GMemoryMonitorInterface.low-memory-warning"></a>low_memory_warning</code></em> ()</p></td> <td class="struct_member_description"><p>the virtual function pointer for the <a class="link" href="GMemoryMonitor.html#GMemoryMonitor-low-memory-warning" title="The “low-memory-warning” signal"><span class="type">“low-memory-warning”</span></a> signal.</p></td> <td class="struct_member_annotations"> </td> </tr></tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-64.html#api-index-2.64">2.64</a></p> </div> <hr> <div class="refsect2"> <a name="GMemoryMonitorWarningLevel"></a><h3>enum GMemoryMonitorWarningLevel</h3> <p>Memory availability warning levels.</p> <p>Note that because new values might be added, it is recommended that applications check <a class="link" href="GMemoryMonitor.html#GMemoryMonitorWarningLevel" title="enum GMemoryMonitorWarningLevel"><span class="type">GMemoryMonitorWarningLevel</span></a> as ranges, for example:</p> <div class="informalexample"> <table class="listing_frame" border="0" cellpadding="0" cellspacing="0"> <tbody> <tr> <td class="listing_lines" align="right"><pre>1 2</pre></td> <td class="listing_code"><pre class="programlisting"><span class="k">if</span> <span class="p">(</span><span class="n">warning_level</span> <span class="o">></span> <span class="n">G_MEMORY_MONITOR_WARNING_LEVEL_LOW</span><span class="p">)</span> <span class="n">drop_caches</span> <span class="p">();</span></pre></td> </tr> </tbody> </table> </div> <p></p> <div class="refsect3"> <a name="GMemoryMonitorWarningLevel.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="enum_members_name"> <col class="enum_members_description"> <col width="200px" class="enum_members_annotations"> </colgroup> <tbody> <tr> <td class="enum_member_name"><p><a name="G-MEMORY-MONITOR-WARNING-LEVEL-LOW:CAPS"></a>G_MEMORY_MONITOR_WARNING_LEVEL_LOW</p></td> <td class="enum_member_description"> <p>Memory on the device is low, processes should free up unneeded resources (for example, in-memory caches) so they can be used elsewhere.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="G-MEMORY-MONITOR-WARNING-LEVEL-MEDIUM:CAPS"></a>G_MEMORY_MONITOR_WARNING_LEVEL_MEDIUM</p></td> <td class="enum_member_description"> <p>Same as <em class="parameter"><code>G_MEMORY_MONITOR_WARNING_LEVEL_LOW</code></em> but the device has even less free memory, so processes should try harder to free up unneeded resources. If your process does not need to stay running, it is a good time for it to quit.</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="G-MEMORY-MONITOR-WARNING-LEVEL-CRITICAL:CAPS"></a>G_MEMORY_MONITOR_WARNING_LEVEL_CRITICAL</p></td> <td class="enum_member_description"> <p>The system will soon start terminating processes to reclaim memory, including background processes.</p> </td> <td class="enum_member_annotations"> </td> </tr> </tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-64.html#api-index-2.64">2.64</a></p> </div> <hr> <div class="refsect2"> <a name="G-MEMORY-MONITOR-EXTENSION-POINT-NAME:CAPS"></a><h3>G_MEMORY_MONITOR_EXTENSION_POINT_NAME</h3> <pre class="programlisting">#define G_MEMORY_MONITOR_EXTENSION_POINT_NAME "gio-memory-monitor" </pre> <p>Extension point for memory usage monitoring functionality. See Extending GIO.</p> <p class="since">Since: <a class="link" href="api-index-2-64.html#api-index-2.64">2.64</a></p> </div> </div> <div class="refsect1"> <a name="GMemoryMonitor.signal-details"></a><h2>Signal Details</h2> <div class="refsect2"> <a name="GMemoryMonitor-low-memory-warning"></a><h3>The <code class="literal">“low-memory-warning”</code> signal</h3> <pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a> *monitor, <a class="link" href="GMemoryMonitor.html#GMemoryMonitorWarningLevel" title="enum GMemoryMonitorWarningLevel"><span class="type">GMemoryMonitorWarningLevel</span></a> level, <span class="type">gpointer</span> user_data)</pre> <p>Emitted when the system is running low on free memory. The signal handler should then take the appropriate action depending on the warning level. See the <a class="link" href="GMemoryMonitor.html#GMemoryMonitorWarningLevel" title="enum GMemoryMonitorWarningLevel"><span class="type">GMemoryMonitorWarningLevel</span></a> documentation for details.</p> <div class="refsect3"> <a name="GMemoryMonitor-low-memory-warning.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>monitor</p></td> <td class="parameter_description"><p>a <a class="link" href="GMemoryMonitor.html" title="GMemoryMonitor"><span class="type">GMemoryMonitor</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>level</p></td> <td class="parameter_description"><p>the <a class="link" href="GMemoryMonitor.html#GMemoryMonitorWarningLevel" title="enum GMemoryMonitorWarningLevel"><span class="type">GMemoryMonitorWarningLevel</span></a> warning level</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>user_data</p></td> <td class="parameter_description"><p>user data set when the signal handler was connected.</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <p>Flags: Run Last</p> <p class="since">Since: <a class="link" href="api-index-2-64.html#api-index-2.64">2.64</a></p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>