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<div class="refentry" title="Hook Functions">
<a name="glib-Hook-Functions"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="glib-Hook-Functions.top_of_page"></a>Hook Functions</span></h2>
<p>Hook Functions — support for manipulating lists of hook functions</p>
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<div class="refsynopsisdiv" title="Synopsis">
<a name="glib-Hook-Functions.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <glib.h>
<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a>;
void (<a class="link" href="glib-Hook-Functions.html#GHookFinalizeFunc" title="GHookFinalizeFunc ()">*GHookFinalizeFunc</a>) (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>;
void (<a class="link" href="glib-Hook-Functions.html#GHookFunc" title="GHookFunc ()">*GHookFunc</a>) (<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> (<a class="link" href="glib-Hook-Functions.html#GHookCheckFunc" title="GHookCheckFunc ()">*GHookCheckFunc</a>) (<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);
void <a class="link" href="glib-Hook-Functions.html#g-hook-list-init" title="g_hook_list_init ()">g_hook_list_init</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#guint" title="guint">guint</a> hook_size);
void <a class="link" href="glib-Hook-Functions.html#g-hook-list-invoke" title="g_hook_list_invoke ()">g_hook_list_invoke</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse);
void <a class="link" href="glib-Hook-Functions.html#g-hook-list-invoke-check" title="g_hook_list_invoke_check ()">g_hook_list_invoke_check</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse);
void <a class="link" href="glib-Hook-Functions.html#g-hook-list-marshal" title="g_hook_list_marshal ()">g_hook_list_marshal</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse,
<a class="link" href="glib-Hook-Functions.html#GHookMarshaller" title="GHookMarshaller ()">GHookMarshaller</a> marshaller,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);
void (<a class="link" href="glib-Hook-Functions.html#GHookMarshaller" title="GHookMarshaller ()">*GHookMarshaller</a>) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);
void <a class="link" href="glib-Hook-Functions.html#g-hook-list-marshal-check" title="g_hook_list_marshal_check ()">g_hook_list_marshal_check</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse,
<a class="link" href="glib-Hook-Functions.html#GHookCheckMarshaller" title="GHookCheckMarshaller ()">GHookCheckMarshaller</a> marshaller,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> (<a class="link" href="glib-Hook-Functions.html#GHookCheckMarshaller" title="GHookCheckMarshaller ()">*GHookCheckMarshaller</a>) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);
void <a class="link" href="glib-Hook-Functions.html#g-hook-list-clear" title="g_hook_list_clear ()">g_hook_list_clear</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-alloc" title="g_hook_alloc ()">g_hook_alloc</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list);
#define <a class="link" href="glib-Hook-Functions.html#g-hook-append" title="g_hook_append()">g_hook_append</a> ( hook_list, hook )
void <a class="link" href="glib-Hook-Functions.html#g-hook-prepend" title="g_hook_prepend ()">g_hook_prepend</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
void <a class="link" href="glib-Hook-Functions.html#g-hook-insert-before" title="g_hook_insert_before ()">g_hook_insert_before</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *sibling,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
void <a class="link" href="glib-Hook-Functions.html#g-hook-insert-sorted" title="g_hook_insert_sorted ()">g_hook_insert_sorted</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Hook-Functions.html#GHookCompareFunc" title="GHookCompareFunc ()">GHookCompareFunc</a> func);
<a class="link" href="glib-Basic-Types.html#gint" title="gint">gint</a> (<a class="link" href="glib-Hook-Functions.html#GHookCompareFunc" title="GHookCompareFunc ()">*GHookCompareFunc</a>) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *new_hook,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *sibling);
<a class="link" href="glib-Basic-Types.html#gint" title="gint">gint</a> <a class="link" href="glib-Hook-Functions.html#g-hook-compare-ids" title="g_hook_compare_ids ()">g_hook_compare_ids</a> (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *new_hook,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *sibling);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-get" title="g_hook_get ()">g_hook_get</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gulong" title="gulong">gulong</a> hook_id);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-find" title="g_hook_find ()">g_hook_find</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Hook-Functions.html#GHookFindFunc" title="GHookFindFunc ()">GHookFindFunc</a> func,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> (<a class="link" href="glib-Hook-Functions.html#GHookFindFunc" title="GHookFindFunc ()">*GHookFindFunc</a>) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-find-data" title="g_hook_find_data ()">g_hook_find_data</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-find-func" title="g_hook_find_func ()">g_hook_find_func</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> func);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-find-func-data" title="g_hook_find_func_data ()">g_hook_find_func_data</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> func,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-first-valid" title="g_hook_first_valid ()">g_hook_first_valid</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_be_in_call);
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* <a class="link" href="glib-Hook-Functions.html#g-hook-next-valid" title="g_hook_next_valid ()">g_hook_next_valid</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_be_in_call);
enum <a class="link" href="glib-Hook-Functions.html#GHookFlagMask" title="enum GHookFlagMask">GHookFlagMask</a>;
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK-FLAGS--CAPS" title="G_HOOK_FLAGS()">G_HOOK_FLAGS</a> (hook)
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK-FLAG-USER-SHIFT--CAPS" title="G_HOOK_FLAG_USER_SHIFT">G_HOOK_FLAG_USER_SHIFT</a>
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK--CAPS" title="G_HOOK()">G_HOOK</a> (hook)
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK-IS-VALID--CAPS" title="G_HOOK_IS_VALID()">G_HOOK_IS_VALID</a> (hook)
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK-ACTIVE--CAPS" title="G_HOOK_ACTIVE()">G_HOOK_ACTIVE</a> (hook)
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK-IN-CALL--CAPS" title="G_HOOK_IN_CALL()">G_HOOK_IN_CALL</a> (hook)
#define <a class="link" href="glib-Hook-Functions.html#G-HOOK-IS-UNLINKED--CAPS" title="G_HOOK_IS_UNLINKED()">G_HOOK_IS_UNLINKED</a> (hook)
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> * <a class="link" href="glib-Hook-Functions.html#g-hook-ref" title="g_hook_ref ()">g_hook_ref</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
void <a class="link" href="glib-Hook-Functions.html#g-hook-unref" title="g_hook_unref ()">g_hook_unref</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
void <a class="link" href="glib-Hook-Functions.html#g-hook-free" title="g_hook_free ()">g_hook_free</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> <a class="link" href="glib-Hook-Functions.html#g-hook-destroy" title="g_hook_destroy ()">g_hook_destroy</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gulong" title="gulong">gulong</a> hook_id);
void <a class="link" href="glib-Hook-Functions.html#g-hook-destroy-link" title="g_hook_destroy_link ()">g_hook_destroy_link</a> (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="glib-Hook-Functions.description"></a><h2>Description</h2>
<p>
The <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>, <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> and their related functions provide support for
lists of hook functions. Functions can be added and removed from the lists,
and the list of hook functions can be invoked.
</p>
</div>
<div class="refsect1" title="Details">
<a name="glib-Hook-Functions.details"></a><h2>Details</h2>
<div class="refsect2" title="GHookList">
<a name="GHookList"></a><h3>GHookList</h3>
<pre class="programlisting">typedef struct {
gulong seq_id;
guint hook_size : 16;
guint is_setup : 1;
GHook *hooks;
gpointer dummy3;
GHookFinalizeFunc finalize_hook;
gpointer dummy[2];
} GHookList;
</pre>
<p>
The <span class="structname">GHookList</span> struct represents a
list of hook functions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gulong" title="gulong">gulong</a> <em class="structfield"><code>seq_id</code></em>;</span></p></td>
<td>the next free <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> id
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#guint" title="guint">guint</a> <em class="structfield"><code>hook_size</code></em> : 16;</span></p></td>
<td>the size of the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> elements, in bytes
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#guint" title="guint">guint</a> <em class="structfield"><code>is_setup</code></em> : 1;</span></p></td>
<td>1 if the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> has been initialized
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *<em class="structfield"><code>hooks</code></em>;</span></p></td>
<td>the first <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> element in the list
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> <em class="structfield"><code>dummy3</code></em>;</span></p></td>
<td>unused
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Hook-Functions.html#GHookFinalizeFunc" title="GHookFinalizeFunc ()">GHookFinalizeFunc</a> <em class="structfield"><code>finalize_hook</code></em>;</span></p></td>
<td>the function to call to finalize a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> element. The
default behaviour is to call the hooks <code class="function">destroy</code> function
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> <em class="structfield"><code>dummy</code></em>[2];</span></p></td>
<td>unused
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookFinalizeFunc ()">
<a name="GHookFinalizeFunc"></a><h3>GHookFinalizeFunc ()</h3>
<pre class="programlisting">void (*GHookFinalizeFunc) (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Defines the type of function to be called when a hook in a
list of hooks gets finalized.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the hook in <em class="parameter"><code>hook_list</code></em> that gets finalized
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHook">
<a name="GHook"></a><h3>GHook</h3>
<pre class="programlisting">typedef struct {
gpointer data;
GHook *next;
GHook *prev;
guint ref_count;
gulong hook_id;
guint flags;
gpointer func;
GDestroyNotify destroy;
} GHook;
</pre>
<p>
The <span class="structname">GHook</span> struct represents a single hook
function in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> <em class="structfield"><code>data</code></em>;</span></p></td>
<td>data which is passed to func when this hook is invoked
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *<em class="structfield"><code>next</code></em>;</span></p></td>
<td>pointer to the next hook in the list
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *<em class="structfield"><code>prev</code></em>;</span></p></td>
<td>pointer to the previous hook in the list
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#guint" title="guint">guint</a> <em class="structfield"><code>ref_count</code></em>;</span></p></td>
<td>the reference count of this hook
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gulong" title="gulong">gulong</a> <em class="structfield"><code>hook_id</code></em>;</span></p></td>
<td>the id of this hook, which is unique within its list
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#guint" title="guint">guint</a> <em class="structfield"><code>flags</code></em>;</span></p></td>
<td>flags which are set for this hook. See <a class="link" href="glib-Hook-Functions.html#GHookFlagMask" title="enum GHookFlagMask"><span class="type">GHookFlagMask</span></a> for
predefined flags
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> <em class="structfield"><code>func</code></em>;</span></p></td>
<td>the function to call when this hook is invoked. The possible
signatures for this function are <a class="link" href="glib-Hook-Functions.html#GHookFunc" title="GHookFunc ()"><span class="type">GHookFunc</span></a> and <a class="link" href="glib-Hook-Functions.html#GHookCheckFunc" title="GHookCheckFunc ()"><span class="type">GHookCheckFunc</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="glib-Datasets.html#GDestroyNotify" title="GDestroyNotify ()">GDestroyNotify</a> <em class="structfield"><code>destroy</code></em>;</span></p></td>
<td>the default <code class="function">finalize_hook</code> function of a
<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> calls this member of the hook that is being finalized
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookFunc ()">
<a name="GHookFunc"></a><h3>GHookFunc ()</h3>
<pre class="programlisting">void (*GHookFunc) (<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);</pre>
<p>
Defines the type of a hook function that can be invoked
by <a class="link" href="glib-Hook-Functions.html#g-hook-list-invoke" title="g_hook_list_invoke ()"><code class="function">g_hook_list_invoke()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data field of the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is passed to the hook function here
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookCheckFunc ()">
<a name="GHookCheckFunc"></a><h3>GHookCheckFunc ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> (*GHookCheckFunc) (<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);</pre>
<p>
Defines the type of a hook function that can be invoked
by <a class="link" href="glib-Hook-Functions.html#g-hook-list-invoke-check" title="g_hook_list_invoke_check ()"><code class="function">g_hook_list_invoke_check()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data field of the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is passed to the hook function here
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%FALSE if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> should be destroyed
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_list_init ()">
<a name="g-hook-list-init"></a><h3>g_hook_list_init ()</h3>
<pre class="programlisting">void g_hook_list_init (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#guint" title="guint">guint</a> hook_size);</pre>
<p>
Initializes a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
This must be called before the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> is used.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_size</code></em> :</span></p></td>
<td>the size of each element in the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>, typically
<code class="literal">sizeof (GHook)</code>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_list_invoke ()">
<a name="g-hook-list-invoke"></a><h3>g_hook_list_invoke ()</h3>
<pre class="programlisting">void g_hook_list_invoke (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse);</pre>
<p>
Calls all of the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> functions in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>may_recurse</code></em> :</span></p></td>
<td>%TRUE if functions which are already running (e.g. in another
thread) can be called. If set to <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>, these are skipped
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_list_invoke_check ()">
<a name="g-hook-list-invoke-check"></a><h3>g_hook_list_invoke_check ()</h3>
<pre class="programlisting">void g_hook_list_invoke_check (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse);</pre>
<p>
Calls all of the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> functions in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
Any function which returns <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a> is removed from the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>may_recurse</code></em> :</span></p></td>
<td>%TRUE if functions which are already running (e.g. in another
thread) can be called. If set to <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>, these are skipped
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_list_marshal ()">
<a name="g-hook-list-marshal"></a><h3>g_hook_list_marshal ()</h3>
<pre class="programlisting">void g_hook_list_marshal (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse,
<a class="link" href="glib-Hook-Functions.html#GHookMarshaller" title="GHookMarshaller ()">GHookMarshaller</a> marshaller,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);</pre>
<p>
Calls a function on each valid <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>may_recurse</code></em> :</span></p></td>
<td>%TRUE if hooks which are currently running (e.g. in another
thread) are considered valid. If set to <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>, these are skipped
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>marshaller</code></em> :</span></p></td>
<td>the function to call for each <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>marshal_data</code></em> :</span></p></td>
<td>data to pass to <em class="parameter"><code>marshaller</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookMarshaller ()">
<a name="GHookMarshaller"></a><h3>GHookMarshaller ()</h3>
<pre class="programlisting">void (*GHookMarshaller) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);</pre>
<p>
Defines the type of function used by <a class="link" href="glib-Hook-Functions.html#g-hook-list-marshal" title="g_hook_list_marshal ()"><code class="function">g_hook_list_marshal()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>marshal_data</code></em> :</span></p></td>
<td>user data
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_list_marshal_check ()">
<a name="g-hook-list-marshal-check"></a><h3>g_hook_list_marshal_check ()</h3>
<pre class="programlisting">void g_hook_list_marshal_check (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_recurse,
<a class="link" href="glib-Hook-Functions.html#GHookCheckMarshaller" title="GHookCheckMarshaller ()">GHookCheckMarshaller</a> marshaller,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);</pre>
<p>
Calls a function on each valid <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> and destroys it if the
function returns <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>may_recurse</code></em> :</span></p></td>
<td>%TRUE if hooks which are currently running (e.g. in another
thread) are considered valid. If set to <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>, these are skipped
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>marshaller</code></em> :</span></p></td>
<td>the function to call for each <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>marshal_data</code></em> :</span></p></td>
<td>data to pass to <em class="parameter"><code>marshaller</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookCheckMarshaller ()">
<a name="GHookCheckMarshaller"></a><h3>GHookCheckMarshaller ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> (*GHookCheckMarshaller) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> marshal_data);</pre>
<p>
Defines the type of function used by <a class="link" href="glib-Hook-Functions.html#g-hook-list-marshal-check" title="g_hook_list_marshal_check ()"><code class="function">g_hook_list_marshal_check()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>marshal_data</code></em> :</span></p></td>
<td>user data
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%FALSE if <em class="parameter"><code>hook</code></em> should be destroyed
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_list_clear ()">
<a name="g-hook-list-clear"></a><h3>g_hook_list_clear ()</h3>
<pre class="programlisting">void g_hook_list_clear (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list);</pre>
<p>
Removes all the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements from a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_alloc ()">
<a name="g-hook-alloc"></a><h3>g_hook_alloc ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_alloc (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list);</pre>
<p>
Allocates space for a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> and initializes it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_append()">
<a name="g-hook-append"></a><h3>g_hook_append()</h3>
<pre class="programlisting">#define g_hook_append( hook_list, hook )</pre>
<p>
Appends a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> onto the end of a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to add to the end of <em class="parameter"><code>hook_list</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_prepend ()">
<a name="g-hook-prepend"></a><h3>g_hook_prepend ()</h3>
<pre class="programlisting">void g_hook_prepend (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Prepends a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> on the start of a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to add to the start of <em class="parameter"><code>hook_list</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_insert_before ()">
<a name="g-hook-insert-before"></a><h3>g_hook_insert_before ()</h3>
<pre class="programlisting">void g_hook_insert_before (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *sibling,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Inserts a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> into a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>, before a given <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sibling</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to insert the new <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> before
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to insert
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_insert_sorted ()">
<a name="g-hook-insert-sorted"></a><h3>g_hook_insert_sorted ()</h3>
<pre class="programlisting">void g_hook_insert_sorted (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Hook-Functions.html#GHookCompareFunc" title="GHookCompareFunc ()">GHookCompareFunc</a> func);</pre>
<p>
Inserts a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> into a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>, sorted by the given function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to insert
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the comparison function used to sort the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookCompareFunc ()">
<a name="GHookCompareFunc"></a><h3>GHookCompareFunc ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint">gint</a> (*GHookCompareFunc) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *new_hook,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *sibling);</pre>
<p>
Defines the type of function used to compare <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements in
<a class="link" href="glib-Hook-Functions.html#g-hook-insert-sorted" title="g_hook_insert_sorted ()"><code class="function">g_hook_insert_sorted()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> being inserted
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sibling</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to compare with <em class="parameter"><code>new_hook</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a value <= 0 if <em class="parameter"><code>new_hook</code></em> should be before <em class="parameter"><code>sibling</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_compare_ids ()">
<a name="g-hook-compare-ids"></a><h3>g_hook_compare_ids ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint">gint</a> g_hook_compare_ids (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *new_hook,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *sibling);</pre>
<p>
Compares the ids of two <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements, returning a negative value
if the second id is greater than the first.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sibling</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to compare with <em class="parameter"><code>new_hook</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a value <= 0 if the id of <em class="parameter"><code>sibling</code></em> is >= the id of <em class="parameter"><code>new_hook</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_get ()">
<a name="g-hook-get"></a><h3>g_hook_get ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_get (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gulong" title="gulong">gulong</a> hook_id);</pre>
<p>
Returns the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> with the given id, or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if it is not found.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_id</code></em> :</span></p></td>
<td>a hook id
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> with the given id, or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if it is not found
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_find ()">
<a name="g-hook-find"></a><h3>g_hook_find ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_find (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Hook-Functions.html#GHookFindFunc" title="GHookFindFunc ()">GHookFindFunc</a> func,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);</pre>
<p>
Finds a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> using the given function to test for a match.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>need_valids</code></em> :</span></p></td>
<td>%TRUE if <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements which have been destroyed should be
skipped
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to call for each <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>, which should return <a class="link" href="glib-Standard-Macros.html#TRUE--CAPS" title="TRUE"><code class="literal">TRUE</code></a> when
the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> has been found
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to pass to <em class="parameter"><code>func</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the found <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if no matching <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is found
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="GHookFindFunc ()">
<a name="GHookFindFunc"></a><h3>GHookFindFunc ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> (*GHookFindFunc) (<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);</pre>
<p>
Defines the type of the function passed to <a class="link" href="glib-Hook-Functions.html#g-hook-find" title="g_hook_find ()"><code class="function">g_hook_find()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>user data passed to <a class="link" href="glib-Hook-Functions.html#g-hook-find-func" title="g_hook_find_func ()"><code class="function">g_hook_find_func()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%TRUE if the required <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> has been found
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_find_data ()">
<a name="g-hook-find-data"></a><h3>g_hook_find_data ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_find_data (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);</pre>
<p>
Finds a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> with the given data.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>need_valids</code></em> :</span></p></td>
<td>%TRUE if <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements which have been destroyed should be
skipped
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to find
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> with the given <em class="parameter"><code>data</code></em> or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if no matching
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is found
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_find_func ()">
<a name="g-hook-find-func"></a><h3>g_hook_find_func ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_find_func (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> func);</pre>
<p>
Finds a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> with the given function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>need_valids</code></em> :</span></p></td>
<td>%TRUE if <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements which have been destroyed should be
skipped
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to find
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> with the given <em class="parameter"><code>func</code></em> or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if no matching
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is found
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_find_func_data ()">
<a name="g-hook-find-func-data"></a><h3>g_hook_find_func_data ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_find_func_data (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> need_valids,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> func,
<a class="link" href="glib-Basic-Types.html#gpointer" title="gpointer">gpointer</a> data);</pre>
<p>
Finds a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> with the given function and data.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>need_valids</code></em> :</span></p></td>
<td>%TRUE if <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> elements which have been destroyed should be
skipped
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to find
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to find
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> with the given <em class="parameter"><code>func</code></em> and <em class="parameter"><code>data</code></em> or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if no matching
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is found
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_first_valid ()">
<a name="g-hook-first-valid"></a><h3>g_hook_first_valid ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_first_valid (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_be_in_call);</pre>
<p>
Returns the first <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> which has not been destroyed.
The reference count for the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is incremented, so you must call
<a class="link" href="glib-Hook-Functions.html#g-hook-unref" title="g_hook_unref ()"><code class="function">g_hook_unref()</code></a> to restore it when no longer needed. (Or call
<a class="link" href="glib-Hook-Functions.html#g-hook-next-valid" title="g_hook_next_valid ()"><code class="function">g_hook_next_valid()</code></a> if you are stepping through the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>may_be_in_call</code></em> :</span></p></td>
<td>%TRUE if hooks which are currently running (e.g. in another
thread) are considered valid. If set to <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>, these are skipped
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the first valid <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if none are valid
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_next_valid ()">
<a name="g-hook-next-valid"></a><h3>g_hook_next_valid ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a>* g_hook_next_valid (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook,
<a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> may_be_in_call);</pre>
<p>
Returns the next <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> which has not been destroyed.
The reference count for the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is incremented, so you must call
<a class="link" href="glib-Hook-Functions.html#g-hook-unref" title="g_hook_unref ()"><code class="function">g_hook_unref()</code></a> to restore it when no longer needed. (Or continue to call
<a class="link" href="glib-Hook-Functions.html#g-hook-next-valid" title="g_hook_next_valid ()"><code class="function">g_hook_next_valid()</code></a> until <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> is returned.)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the current <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>may_be_in_call</code></em> :</span></p></td>
<td>%TRUE if hooks which are currently running (e.g. in another
thread) are considered valid. If set to <a class="link" href="glib-Standard-Macros.html#FALSE--CAPS" title="FALSE"><code class="literal">FALSE</code></a>, these are skipped
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the next valid <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL--CAPS" title="NULL"><code class="literal">NULL</code></a> if none are valid
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="enum GHookFlagMask">
<a name="GHookFlagMask"></a><h3>enum GHookFlagMask</h3>
<pre class="programlisting">typedef enum
{
G_HOOK_FLAG_ACTIVE = 1 << 0,
G_HOOK_FLAG_IN_CALL = 1 << 1,
G_HOOK_FLAG_MASK = 0x0f
} GHookFlagMask;
</pre>
<p>
Flags used internally in the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> implementation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="G-HOOK-FLAG-ACTIVE--CAPS"></a><span class="term"><code class="literal">G_HOOK_FLAG_ACTIVE</code></span></p></td>
<td>set if the hook has not been destroyed
</td>
</tr>
<tr>
<td><p><a name="G-HOOK-FLAG-IN-CALL--CAPS"></a><span class="term"><code class="literal">G_HOOK_FLAG_IN_CALL</code></span></p></td>
<td>set if the hook is currently being run
</td>
</tr>
<tr>
<td><p><a name="G-HOOK-FLAG-MASK--CAPS"></a><span class="term"><code class="literal">G_HOOK_FLAG_MASK</code></span></p></td>
<td>A mask covering all bits reserved for
hook flags; see <span class="type">G_HOOK_FLAGS_USER_SHIFT</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="G_HOOK_FLAGS()">
<a name="G-HOOK-FLAGS--CAPS"></a><h3>G_HOOK_FLAGS()</h3>
<pre class="programlisting">#define G_HOOK_FLAGS(hook)</pre>
<p>
Returns the flags of a hook.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="G_HOOK_FLAG_USER_SHIFT">
<a name="G-HOOK-FLAG-USER-SHIFT--CAPS"></a><h3>G_HOOK_FLAG_USER_SHIFT</h3>
<pre class="programlisting">#define G_HOOK_FLAG_USER_SHIFT</pre>
<p>
The position of the first bit which is not reserved for internal
use be the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> implementation, i.e.
<code class="literal">1 << G_HOOK_FLAG_USER_SHIFT</code> is the first bit
which can be used for application-defined flags.
</p>
</div>
<hr>
<div class="refsect2" title="G_HOOK()">
<a name="G-HOOK--CAPS"></a><h3>G_HOOK()</h3>
<pre class="programlisting">#define G_HOOK(hook)</pre>
<p>
Casts a pointer to a <code class="literal">GHook*</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a pointer
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="G_HOOK_IS_VALID()">
<a name="G-HOOK-IS-VALID--CAPS"></a><h3>G_HOOK_IS_VALID()</h3>
<pre class="programlisting">#define G_HOOK_IS_VALID(hook)</pre>
<p>
Returns <a class="link" href="glib-Standard-Macros.html#TRUE--CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is valid, i.e. it is in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>, it is active
and it has not been destroyed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%TRUE if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is valid
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="G_HOOK_ACTIVE()">
<a name="G-HOOK-ACTIVE--CAPS"></a><h3>G_HOOK_ACTIVE()</h3>
<pre class="programlisting">#define G_HOOK_ACTIVE(hook)</pre>
<p>
Returns <a class="link" href="glib-Standard-Macros.html#TRUE--CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is active, which is normally <a class="link" href="glib-Standard-Macros.html#TRUE--CAPS" title="TRUE"><code class="literal">TRUE</code></a> until the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
is destroyed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%TRUE if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is active
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="G_HOOK_IN_CALL()">
<a name="G-HOOK-IN-CALL--CAPS"></a><h3>G_HOOK_IN_CALL()</h3>
<pre class="programlisting">#define G_HOOK_IN_CALL(hook)</pre>
<p>
Returns <a class="link" href="glib-Standard-Macros.html#TRUE--CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> function is currently executing.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%TRUE if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> function is currently executing
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="G_HOOK_IS_UNLINKED()">
<a name="G-HOOK-IS-UNLINKED--CAPS"></a><h3>G_HOOK_IS_UNLINKED()</h3>
<pre class="programlisting">#define G_HOOK_IS_UNLINKED(hook)</pre>
<p>
Returns <a class="link" href="glib-Standard-Macros.html#TRUE--CAPS" title="TRUE"><code class="literal">TRUE</code></a> if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is not in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%TRUE if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is not in a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_ref ()">
<a name="g-hook-ref"></a><h3>g_hook_ref ()</h3>
<pre class="programlisting"><a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> * g_hook_ref (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Increments the reference count for a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to increment the reference count of
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <em class="parameter"><code>hook</code></em> that was passed in (since 2.6)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_unref ()">
<a name="g-hook-unref"></a><h3>g_hook_unref ()</h3>
<pre class="programlisting">void g_hook_unref (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Decrements the reference count of a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>.
If the reference count falls to 0, the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> is removed from the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
and <a class="link" href="glib-Hook-Functions.html#g-hook-free" title="g_hook_free ()"><code class="function">g_hook_free()</code></a> is called to free it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to unref
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_free ()">
<a name="g-hook-free"></a><h3>g_hook_free ()</h3>
<pre class="programlisting">void g_hook_free (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Calls the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> <em class="parameter"><code>finalize_hook</code></em> function if it exists, and frees the memory
allocated for the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to free
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_destroy ()">
<a name="g-hook-destroy"></a><h3>g_hook_destroy ()</h3>
<pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean">gboolean</a> g_hook_destroy (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Basic-Types.html#gulong" title="gulong">gulong</a> hook_id);</pre>
<p>
Destroys a <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a>, given its ID.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_id</code></em> :</span></p></td>
<td>a hook ID
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>%TRUE if the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> was found in the <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a> and destroyed
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="g_hook_destroy_link ()">
<a name="g-hook-destroy-link"></a><h3>g_hook_destroy_link ()</h3>
<pre class="programlisting">void g_hook_destroy_link (<a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList">GHookList</a> *hook_list,
<a class="link" href="glib-Hook-Functions.html#GHook" title="GHook">GHook</a> *hook);</pre>
<p>
Removes one <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> from a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>, marking it inactive and calling
<a class="link" href="glib-Hook-Functions.html#g-hook-unref" title="g_hook_unref ()"><code class="function">g_hook_unref()</code></a> on it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook_list</code></em> :</span></p></td>
<td>a <a class="link" href="glib-Hook-Functions.html#GHookList" title="GHookList"><span class="type">GHookList</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hook</code></em> :</span></p></td>
<td>the <a class="link" href="glib-Hook-Functions.html#GHook" title="GHook"><span class="type">GHook</span></a> to remove
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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