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<title>GdaThreadWrapper: GNOME Data Access 5 manual</title>
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<a href="#GdaThreadWrapper.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
<a href="#GdaThreadWrapper.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<div class="refentry">
<a name="GdaThreadWrapper"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GdaThreadWrapper.top_of_page"></a>GdaThreadWrapper</span></h2>
<p>GdaThreadWrapper — Execute functions in a sub thread</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GdaThreadWrapper.stability-level"></a><h2>Stability Level</h2>
<a href="http://foldoc.org/Stable"><span class="acronym">Stable</span></a>, unless otherwise indicated
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="returnvalue">GdaThreadWrapper</span></a> *
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-new" title="gda_thread_wrapper_new ()">gda_thread_wrapper_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="returnvalue">GIOChannel</span></a> *
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-get-io-channel" title="gda_thread_wrapper_get_io_channel ()">gda_thread_wrapper_get_io_channel</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-unset-io-channel" title="gda_thread_wrapper_unset_io_channel ()">gda_thread_wrapper_unset_io_channel</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperFunc" title="GdaThreadWrapperFunc ()">*GdaThreadWrapperFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute" title="gda_thread_wrapper_execute ()">gda_thread_wrapper_execute</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperVoidFunc" title="GdaThreadWrapperVoidFunc ()">*GdaThreadWrapperVoidFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()">gda_thread_wrapper_execute_void</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-cancel" title="gda_thread_wrapper_cancel ()">gda_thread_wrapper_cancel</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()">gda_thread_wrapper_iterate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()">gda_thread_wrapper_fetch_result</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-get-waiting-size" title="gda_thread_wrapper_get_waiting_size ()">gda_thread_wrapper_get_waiting_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperCallback" title="GdaThreadWrapperCallback ()">*GdaThreadWrapperCallback</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()">gda_thread_wrapper_connect_raw</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-disconnect" title="gda_thread_wrapper_disconnect ()">gda_thread_wrapper_disconnect</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-steal-signal" title="gda_thread_wrapper_steal_signal ()">gda_thread_wrapper_steal_signal</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapper-struct" title="struct GdaThreadWrapper">GdaThreadWrapper</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GdaThreadWrapper.html#GdaThreadNotification" title="GdaThreadNotification">GdaThreadNotification</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="GdaThreadWrapper.html#GdaThreadNotificationType" title="enum GdaThreadNotificationType">GdaThreadNotificationType</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> GdaThreadWrapper
</pre>
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libgda/thread-wrapper/gda-thread-wrapper.h>
</pre>
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.description"></a><h2>Description</h2>
<p>The purpose of the <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object is to execute functions in an isolated sub thread. As the
<a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> is thread safe, one is able to isolate some code's execution is a <span class="emphasis"><em>private</em></span>
<span class="emphasis"><em>worker</em></span> thread, and make a non thread safe code thread safe.</p>
<p>The downside of this is that the actual execution of the code will be slower as it requires
threads to be synchronized.</p>
<p>The <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> implements its own locking mechanism and can safely be used from multiple
threads at once without needing further locking.</p>
<p>Each thread using a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object can use it as if it was the only user: the <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> will
simply dispatch all the execution requests to its private <span class="emphasis"><em>worker</em></span> thread and report the
execution's status only to the thread which made the request.</p>
<p>The user can also specify a callback function to be called when an object emits a signal while being
used by the worker thread, see the <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a> method.</p>
<p>The following diagram illustrates the conceptual working of the <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object: here two user threads
are represented (assigned a red and green colors), both using a single <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a>, so in this diagram, 3 threads
are present. The communication between the threads are handled by some <a href="../glib/glib-Asynchronous-Queues.html#GAsyncQueue"><span class="type">GAsyncQueue</span></a> objects (in a transparent way for
the user, presented here only for illustration purposes). The queue represented in yellow is where jobs are
pushed by each user thread (step 1), and popped by the worker thread (step 2). Once the worker thread has finished
with a job, it stores the result along with the job and pushes it to the queue dedicated to the user thread
(step 3) in this example the red queue (because the job was issued from the thread represented in red). The last
step is when the user fetches the result (in its user thread), step 4.</p>
<p>If, when the worker thread is busy with a job, a signal is emitted, and if the user has set up a signal handler
using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>,
then a "job as signal" is created by the worker thread and pushed to the user thread as illustrated
at the bottom of the diagram.</p>
<div class="mediaobject"><img src="thread-wrapper.png" width="602" alt="GdaThreadWrapper's conceptual working"></div>
<p>It's the user's responsability to regularly check if a submitted job has completed
(using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a>) or if a signal
has been emitted by an object while in the worker thread and needs to be handled by the <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a>
to call the associated callback (using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()"><code class="function">gda_thread_wrapper_iterate()</code></a> or automatically done when
calling <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a>).</p>
<p>However, when a main loop is available, the <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> can emit notifications through a
<a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> which can be intregated in the main loop. The <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> can be created
using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-get-io-channel" title="gda_thread_wrapper_get_io_channel ()"><code class="function">gda_thread_wrapper_get_io_channel()</code></a>.</p>
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gda-thread-wrapper-new"></a><h3>gda_thread_wrapper_new ()</h3>
<pre class="programlisting"><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="returnvalue">GdaThreadWrapper</span></a> *
gda_thread_wrapper_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p>
<div class="refsect3">
<a name="gda-thread-wrapper-new.returns"></a><h4>Returns</h4>
<p> a new <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if threads are not supported/enabled</p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-get-io-channel"></a><h3>gda_thread_wrapper_get_io_channel ()</h3>
<pre class="programlisting"><a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="returnvalue">GIOChannel</span></a> *
gda_thread_wrapper_get_io_channel (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>);</pre>
<p>Allow <em class="parameter"><code>wrapper</code></em>
to notify when an execution job is finished, by making its exec ID
readable through a new <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a>. This function is useful when the notification needs
to be included into a main loop. This also notifies that signals (emitted by objects in
<em class="parameter"><code>wrapper</code></em>
's internal thread) are available.</p>
<p>The returned <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> will have something to read everytime an execution job is finished
for an execution job submitted from the calling thread. The user whould read <a class="link" href="GdaThreadWrapper.html#GdaThreadNotification" title="GdaThreadNotification"><span class="type">GdaThreadNotification</span></a>
structures from the channel and analyse its contents to call <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()"><code class="function">gda_thread_wrapper_iterate()</code></a>
or <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a>.</p>
<p>Note1: the new communication channel will only be operational for jobs submitted after this
function returns, and for signals which have been connected after this function returns. A safe
practice is to call this function before the <em class="parameter"><code>wrapper</code></em>
object has been used.</p>
<p>Note2: this function will return the same <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> everytime it's called from the same thread.</p>
<p>Note3: if the usage of the returned <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> reveals an error, then <a href="../glib/glib-IO-Channels.html#g-io-channel-shutdown"><code class="function">g_io_channel_shutdown()</code></a> and
<a href="../glib/glib-IO-Channels.html#g-io-channel-unref"><code class="function">g_io_channel_unref()</code></a> should be called on the <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> to let <em class="parameter"><code>wrapper</code></em>
know it should not use
that object anymore.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-get-io-channel.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-get-io-channel.returns"></a><h4>Returns</h4>
<p>a new <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a>, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if it could not be created. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>]</span></p>
</div>
<p class="since">Since: 4.2.9</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-unset-io-channel"></a><h3>gda_thread_wrapper_unset_io_channel ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gda_thread_wrapper_unset_io_channel (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>);</pre>
<p>Does the opposite of <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-get-io-channel" title="gda_thread_wrapper_get_io_channel ()"><code class="function">gda_thread_wrapper_get_io_channel()</code></a></p>
<div class="refsect3">
<a name="gda-thread-wrapper-unset-io-channel.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: 4.2.9</p>
</div>
<hr>
<div class="refsect2">
<a name="GdaThreadWrapperFunc"></a><h3>GdaThreadWrapperFunc ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
<span class="c_punctuation">(</span>*GdaThreadWrapperFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> arg</code></em>,
<em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Specifies the type of function to be passed to <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute" title="gda_thread_wrapper_execute ()"><code class="function">gda_thread_wrapper_execute()</code></a>.</p>
<div class="refsect3">
<a name="GdaThreadWrapperFunc.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>arg</p></td>
<td class="parameter_description"><p>pointer to the data (which is the <em class="parameter"><code>arg</code></em>
argument passed to <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()"><code class="function">gda_thread_wrapper_execute_void()</code></a>)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a place to store errors</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GdaThreadWrapperFunc.returns"></a><h4>Returns</h4>
<p>a pointer to some data which will be returned by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-execute"></a><h3>gda_thread_wrapper_execute ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gda_thread_wrapper_execute (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperFunc" title="GdaThreadWrapperFunc ()"><span class="type">GdaThreadWrapperFunc</span></a> func</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> arg</code></em>,
<em class="parameter"><code><a href="../glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> arg_destroy_func</code></em>,
<em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Make <em class="parameter"><code>wrapper</code></em>
execute the <em class="parameter"><code>func</code></em>
function with the <em class="parameter"><code>arg</code></em>
argument (along with a <a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> which is not <em class="parameter"><code>error</code></em>
)
in the sub thread managed by <em class="parameter"><code>wrapper</code></em>
. To execute a function which does not return anything,
use <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()"><code class="function">gda_thread_wrapper_execute_void()</code></a>.</p>
<p>This method returns immediately, and the caller then needs to use <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a> to
check if the execution has finished and get the result.</p>
<p>Once <em class="parameter"><code>func</code></em>
's execution is finished, if <em class="parameter"><code>arg</code></em>
is not <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the <em class="parameter"><code>arg_destroy_func</code></em>
destruction function is called
on <em class="parameter"><code>arg</code></em>
. This call occurs in the thread calling <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a>.</p>
<p>If an error occurred in this function, then the <em class="parameter"><code>arg_destroy_func</code></em>
function is not called to free <em class="parameter"><code>arg</code></em>
.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-execute.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p>the function to execute, not <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>arg</p></td>
<td class="parameter_description"><p>argument to pass to <em class="parameter"><code>func</code></em>
, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>arg_destroy_func</p></td>
<td class="parameter_description"><p>function to be called when the execution has finished, to destroy <em class="parameter"><code>arg</code></em>
, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a place to store errors, for errors occurring in this method, not errors occurring while <em class="parameter"><code>func</code></em>
is executed, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-execute.returns"></a><h4>Returns</h4>
<p> the job ID, or 0 if an error occurred</p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GdaThreadWrapperVoidFunc"></a><h3>GdaThreadWrapperVoidFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdaThreadWrapperVoidFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> arg</code></em>,
<em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Specifies the type of function to be passed to <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()"><code class="function">gda_thread_wrapper_execute_void()</code></a>.</p>
<div class="refsect3">
<a name="GdaThreadWrapperVoidFunc.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>arg</p></td>
<td class="parameter_description"><p>a pointer to the data (which is the <em class="parameter"><code>arg</code></em>
argument passed to <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()"><code class="function">gda_thread_wrapper_execute_void()</code></a>)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a place to store errors</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-execute-void"></a><h3>gda_thread_wrapper_execute_void ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gda_thread_wrapper_execute_void (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperVoidFunc" title="GdaThreadWrapperVoidFunc ()"><span class="type">GdaThreadWrapperVoidFunc</span></a> func</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> arg</code></em>,
<em class="parameter"><code><a href="../glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> arg_destroy_func</code></em>,
<em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Make <em class="parameter"><code>wrapper</code></em>
execute the <em class="parameter"><code>func</code></em>
function with the <em class="parameter"><code>arg</code></em>
argument (along with a <a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> which is not <em class="parameter"><code>error</code></em>
)
in the sub thread managed by <em class="parameter"><code>wrapper</code></em>
. To execute a function which returns some pointer,
use <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute" title="gda_thread_wrapper_execute ()"><code class="function">gda_thread_wrapper_execute()</code></a>.</p>
<p>This method returns immediately. Calling <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a> is not necessary as <em class="parameter"><code>func</code></em>
does not return any result. However, it may be necessary to call <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()"><code class="function">gda_thread_wrapper_iterate()</code></a> to give <em class="parameter"><code>wrapper</code></em>
a
chance to execute the <em class="parameter"><code>arg_destroy_func</code></em>
function if not <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> (note that <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()"><code class="function">gda_thread_wrapper_iterate()</code></a> is
called by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a> itself).</p>
<p>Once <em class="parameter"><code>func</code></em>
's execution is finished, if <em class="parameter"><code>arg</code></em>
is not <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the <em class="parameter"><code>arg_destroy_func</code></em>
destruction function is called
on <em class="parameter"><code>arg</code></em>
. This call occurs in the thread calling <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a>.</p>
<p>If an error occurred in this function, then the <em class="parameter"><code>arg_destroy_func</code></em>
function is not called to free <em class="parameter"><code>arg</code></em>
.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-execute-void.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p>the function to execute, not <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>arg</p></td>
<td class="parameter_description"><p>argument to pass to <em class="parameter"><code>func</code></em>
. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>arg_destroy_func</p></td>
<td class="parameter_description"><p>function to be called when the execution has finished, to destroy <em class="parameter"><code>arg</code></em>
, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a place to store errors, for errors occurring in this method, not errors occurring while <em class="parameter"><code>func</code></em>
is executed, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-execute-void.returns"></a><h4>Returns</h4>
<p> the job ID, or 0 if an error occurred</p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-cancel"></a><h3>gda_thread_wrapper_cancel ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gda_thread_wrapper_cancel (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> id</code></em>);</pre>
<p>Cancels a job not yet executed. This may fail for the following reasons:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>the job <em class="parameter"><code>id</code></em> could not be found, either because it has already been treated or because
it does not exist or because it was created in another thread</p></li>
<li class="listitem"><p>the job <em class="parameter"><code>id</code></em> is currently being treated by the worker thread</p></li>
</ul></div>
<div class="refsect3">
<a name="gda-thread-wrapper-cancel.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>id</p></td>
<td class="parameter_description"><p>the ID of a job as returned by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute" title="gda_thread_wrapper_execute ()"><code class="function">gda_thread_wrapper_execute()</code></a> or <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()"><code class="function">gda_thread_wrapper_execute_void()</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-cancel.returns"></a><h4>Returns</h4>
<p> <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the job has been cancelled, or <a href="../glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> in any other case.</p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-iterate"></a><h3>gda_thread_wrapper_iterate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gda_thread_wrapper_iterate (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> may_block</code></em>);</pre>
<p>This method gives <em class="parameter"><code>wrapper</code></em>
a chance to check if some functions to be executed have finished
<span class="emphasis"><em>for the calling thread</em></span>. In this case it handles the execution result and
makes it ready to be processed using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-fetch-result" title="gda_thread_wrapper_fetch_result ()"><code class="function">gda_thread_wrapper_fetch_result()</code></a>.</p>
<p>This method also allows <em class="parameter"><code>wrapper</code></em>
to handle signals which may have been emitted by objects
while in the worker thread, and call the callback function specified when <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>
was used.</p>
<p>If <em class="parameter"><code>may_block</code></em>
is <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, then it will block untill there is one finished execution
(functions returning void and signals are ignored regarding this argument).</p>
<div class="refsect3">
<a name="gda-thread-wrapper-iterate.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>may_block</p></td>
<td class="parameter_description"><p>whether the call may block</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-fetch-result"></a><h3>gda_thread_wrapper_fetch_result ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gpointer"><span class="returnvalue">gpointer</span></a>
gda_thread_wrapper_fetch_result (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> may_lock</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> exp_id</code></em>,
<em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Use this method to check if the execution of a function is finished. The function's execution must have
been requested using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute" title="gda_thread_wrapper_execute ()"><code class="function">gda_thread_wrapper_execute()</code></a>.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-fetch-result.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>may_lock</p></td>
<td class="parameter_description"><p>TRUE if this funct must lock the caller untill a result is available</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>exp_id</p></td>
<td class="parameter_description"><p>ID of the job for which a result is expected</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a place to store errors, for errors which may have occurred during the execution, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-fetch-result.returns"></a><h4>Returns</h4>
<p>the pointer returned by the execution, or <a href="../glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if no result is available. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>][<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-get-waiting-size"></a><h3>gda_thread_wrapper_get_waiting_size ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gda_thread_wrapper_get_waiting_size (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>);</pre>
<p>Use this method to query the number of functions which have been queued to be executed
but which have not yet been executed.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-get-waiting-size.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-get-waiting-size.returns"></a><h4>Returns</h4>
<p> the number of jobs not yet executed</p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GdaThreadWrapperCallback"></a><h3>GdaThreadWrapperCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*GdaThreadWrapperCallback<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
<em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *signame</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> n_param_values</code></em>,
<em class="parameter"><code>const <a href="../gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *param_values</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> gda_reserved</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>Specifies the type of function to be passed to <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a></p>
<div class="refsect3">
<a name="GdaThreadWrapperCallback.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>wrapper</p></td>
<td class="parameter_description"><p>the <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>instance</p></td>
<td class="parameter_description"><p>a pointer to the instance which emitted the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>signame</p></td>
<td class="parameter_description"><p>the name of the signal being emitted</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_param_values</p></td>
<td class="parameter_description"><p>number of GValue in <em class="parameter"><code>param_values</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>param_values</p></td>
<td class="parameter_description"><p>array of <em class="parameter"><code>n_param_values</code></em>
GValue</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>gda_reserved</p></td>
<td class="parameter_description"><p>reserved</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>a pointer to the data (which is the <em class="parameter"><code>data</code></em>
argument passed to <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>)</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-connect-raw"></a><h3>gda_thread_wrapper_connect_raw ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
gda_thread_wrapper_connect_raw (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
<em class="parameter"><code>const <a href="../glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *sig_name</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> private_thread</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> private_job</code></em>,
<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperCallback" title="GdaThreadWrapperCallback ()"><span class="type">GdaThreadWrapperCallback</span></a> callback</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>Connects a callback function to a signal for a particular object. The difference with <a href="../gobject/gobject-Signals.html#g-signal-connect"><code class="function">g_signal_connect()</code></a> and
similar functions are:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>the <em class="parameter"><code>callback</code></em> argument is not a <a href="../gobject/gobject-Closures.html#GCallback"><span class="type">GCallback</span></a> function, so the callback signature is not
dependent on the signal itself</p></li>
<li class="listitem"><p>the signal handler must not have to return any value</p></li>
<li class="listitem"><p>the <em class="parameter"><code>callback</code></em> function will be called asynchronously, the caller may need to use
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()"><code class="function">gda_thread_wrapper_iterate()</code></a> to get the notification</p></li>
<li class="listitem"><p>if <em class="parameter"><code>private_job</code></em> and <em class="parameter"><code>private_thread</code></em> control in which case the signal is propagated.</p></li>
</ul></div>
<p>Also note that signal handling is done asynchronously: when emitted in the worker thread, it
will be "queued" to be processed in the user thread when it has the chance (when <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-iterate" title="gda_thread_wrapper_iterate ()"><code class="function">gda_thread_wrapper_iterate()</code></a>
is called directly or indirectly). The side effect is that the callback function is usually
called long after the object emitting the signal has finished emitting it.</p>
<p>To disconnect a signal handler, don't use any of the g_signal_handler_*() functions but the
<a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-disconnect" title="gda_thread_wrapper_disconnect ()"><code class="function">gda_thread_wrapper_disconnect()</code></a> method.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-connect-raw.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>instance</p></td>
<td class="parameter_description"><p>the instance to connect to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sig_name</p></td>
<td class="parameter_description"><p>a string of the form "signal-name::detail"</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>private_thread</p></td>
<td class="parameter_description"><p>set to <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>callback</code></em>
is to be invoked only if the signal has
been emitted while in <em class="parameter"><code>wrapper</code></em>
's private sub thread (ie. used when <em class="parameter"><code>wrapper</code></em>
is executing some functions
specified by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute" title="gda_thread_wrapper_execute ()"><code class="function">gda_thread_wrapper_execute()</code></a> or <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-execute-void" title="gda_thread_wrapper_execute_void ()"><code class="function">gda_thread_wrapper_execute_void()</code></a>), and to <a href="../glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if the
callback is to be invoked whenever the signal is emitted, independently of the thread in which the
signal is emitted.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>private_job</p></td>
<td class="parameter_description"><p>set to <a href="../glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>callback</code></em>
is to be invoked only if the signal has
been emitted when a job created for the calling thread is being executed, and to <a href="../glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>
if <em class="parameter"><code>callback</code></em>
has to be called whenever the <em class="parameter"><code>sig_name</code></em>
signal is emitted by <em class="parameter"><code>instance</code></em>
. Note that
this argument is not taken into account if <em class="parameter"><code>private_thread</code></em>
is set to <a href="../glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html#GdaThreadWrapperCallback" title="GdaThreadWrapperCallback ()"><span class="type">GdaThreadWrapperCallback</span></a> function. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/scope%20call"><span class="acronym">scope call</span></a>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>data to pass to <em class="parameter"><code>callback</code></em>
's calls. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/closure"><span class="acronym">closure</span></a>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gda-thread-wrapper-connect-raw.returns"></a><h4>Returns</h4>
<p> the handler ID</p>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-disconnect"></a><h3>gda_thread_wrapper_disconnect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gda_thread_wrapper_disconnect (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> id</code></em>);</pre>
<p>Disconnects the emission of a signal, does the opposite of <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>.</p>
<p>As soon as this method returns, the callback function set when <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>
was called will not be called anymore (even if the object has emitted the signal in the worker
thread and this signal has not been handled in the user thread).</p>
<div class="refsect3">
<a name="gda-thread-wrapper-disconnect.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>id</p></td>
<td class="parameter_description"><p>a handler ID, as returned by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 4.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gda-thread-wrapper-steal-signal"></a><h3>gda_thread_wrapper_steal_signal ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gda_thread_wrapper_steal_signal (<em class="parameter"><code><a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> *wrapper</code></em>,
<em class="parameter"><code><a href="../glib/glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> id</code></em>);</pre>
<p>Requests that the signal which ID is <em class="parameter"><code>id</code></em>
(which has been obtained using <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>)
be treated by the calling thread instead of by the thread in which <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-connect-raw" title="gda_thread_wrapper_connect_raw ()"><code class="function">gda_thread_wrapper_connect_raw()</code></a>
was called.</p>
<div class="refsect3">
<a name="gda-thread-wrapper-steal-signal.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>wrapper</p></td>
<td class="parameter_description"><p>a <a class="link" href="GdaThreadWrapper.html" title="GdaThreadWrapper"><span class="type">GdaThreadWrapper</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>id</p></td>
<td class="parameter_description"><p>a signal ID</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 4.2</p>
</div>
</div>
<div class="refsect1">
<a name="GdaThreadWrapper.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GdaThreadWrapper-struct"></a><h3>struct GdaThreadWrapper</h3>
<pre class="programlisting">struct GdaThreadWrapper;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GdaThreadNotification"></a><h3>GdaThreadNotification</h3>
<pre class="programlisting">typedef struct {
GdaThreadNotificationType type;
guint job_id;
} GdaThreadNotification;
</pre>
<p>A notification to be read through the <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a> which is returned by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-get-io-channel" title="gda_thread_wrapper_get_io_channel ()"><code class="function">gda_thread_wrapper_get_io_channel()</code></a>,
for example:</p>
<pre class="programlisting">
gboolean
wrapper_ioc_cb (GIOChannel *source, GIOCondition condition, gpointer data)
{
GIOStatus status;
gsize nread;
GdaThreadNotification notif;
if (condition & G_IO_IN) {
status = g_io_channel_read_chars (source, (gchar*) &notif, sizeof (notif), &nread, NULL);
if ((status != G_IO_STATUS_NORMAL) || (nread != sizeof (notif)))
goto onerror;
switch (notif.type) {
case GDA_THREAD_NOTIFICATION_JOB:
check_for_wrapper_result (bcnc);
break;
case GDA_THREAD_NOTIFICATION_SIGNAL:
gda_thread_wrapper_iterate (bcnc->priv->wrapper, FALSE);
break;
default:
goto onerror;
break;
}
}
if (condition & (G_IO_ERR | G_IO_HUP | G_IO_NVAL))
goto onerror;
return TRUE; // keep callback
onerror:
g_io_channel_shutdown (bcnc->priv->ioc, FALSE, NULL);
return FALSE; // removed callback
}
{
[...]
GIOChannel *ioc;
ioc = gda_thread_wrapper_get_io_channel (wrapper);
if (!ioc)
[handle error]
else {
guint watch_id;
watch_id = g_io_add_watch (ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
(GIOFunc) wrapper_ioc_cb, NULL);
}
}
</pre>
<div class="refsect3">
<a name="GdaThreadNotification.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><a class="link" href="GdaThreadWrapper.html#GdaThreadNotificationType" title="enum GdaThreadNotificationType"><span class="type">GdaThreadNotificationType</span></a> <em class="structfield"><code><a name="GdaThreadNotification.type"></a>type</code></em>;</p></td>
<td class="struct_member_description"><p>the notification type</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="../glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GdaThreadNotification.job-id"></a>job_id</code></em>;</p></td>
<td class="struct_member_description"><p>the job ID, if <em class="parameter"><code>type</code></em>
is a <a class="link" href="GdaThreadWrapper.html#GDA-THREAD-NOTIFICATION-JOB:CAPS"><span class="type">GDA_THREAD_NOTIFICATION_JOB</span></a></p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GdaThreadNotificationType"></a><h3>enum GdaThreadNotificationType</h3>
<p>Defines the kind of notification which can be obtained when reading from te <a href="../glib/glib-IO-Channels.html#GIOChannel"><span class="type">GIOChannel</span></a>
returned by <a class="link" href="GdaThreadWrapper.html#gda-thread-wrapper-get-io-channel" title="gda_thread_wrapper_get_io_channel ()"><code class="function">gda_thread_wrapper_get_io_channel()</code></a>.</p>
<div class="refsect3">
<a name="GdaThreadNotificationType.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="GDA-THREAD-NOTIFICATION-JOB:CAPS"></a>GDA_THREAD_NOTIFICATION_JOB</p></td>
<td class="enum_member_description">
<p>the notification regards a job finished</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GDA-THREAD-NOTIFICATION-SIGNAL:CAPS"></a>GDA_THREAD_NOTIFICATION_SIGNAL</p></td>
<td class="enum_member_description">
<p>the notification regards a signal</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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