<div class="refentry" id="glClientWaitSync">

<div class="titlepage"></div>

<div class="refnamediv">

<h2>Name</h2>

<p>glClientWaitSync — block and wait for a sync object to become signaled</p>

</div>

<div class="refsynopsisdiv">

<h2>C Specification</h2>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">GLenum <strong class="fsfunc">glClientWaitSync</strong>(</code>

</td>

<td>GLsync <var class="pdparam">sync</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLbitfield <var class="pdparam">flags</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLuint64 <var class="pdparam">timeout</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

</div>

<div class="refsect1" id="parameters">

<h2>Parameters</h2>

<div class="variablelist">

<dl class="variablelist">

<dt>

<span class="term">

<em class="parameter">

<code>sync</code>

</em>

</span>

</dt>

<dd>

<p>

The sync object whose status to wait on.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>flags</code>

</em>

</span>

</dt>

<dd>

<p>

A bitfield controlling the command flushing behavior. <em class="parameter"><code>flags</code></em> may be <code class="constant">GL_SYNC_FLUSH_COMMANDS_BIT</code>.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>timeout</code>

</em>

</span>

</dt>

<dd>

<p>

The timeout, specified in nanoseconds, for which the implementation should wait for <em class="parameter"><code>sync</code></em> to become signaled.

</p>

</dd>

</dl>

</div>

</div>

<div class="refsect1" id="description">

<h2>Description</h2>

<p>

<code class="function">glClientWaitSync</code> causes the client to block and wait for the sync object specified by <em class="parameter"><code>sync</code></em> to become signaled. If

<em class="parameter"><code>sync</code></em> is signaled when <code class="function">glClientWaitSync</code> is called, <code class="function">glClientWaitSync</code> returns immediately, otherwise

it will block and wait for up to <em class="parameter"><code>timeout</code></em> nanoseconds for <em class="parameter"><code>sync</code></em> to become signaled.

</p>

<p>

The return value is one of four status values:

</p>

<div class="itemizedlist">

<ul class="itemizedlist" style="list-style-type: disc; ">

<li class="listitem">

<p>

<code class="constant">GL_ALREADY_SIGNALED</code> indicates that <em class="parameter"><code>sync</code></em> was signaled at the time that <code class="function">glClientWaitSync</code>

was called.

</p>

</li>

<li class="listitem">

<p>

<code class="constant">GL_TIMEOUT_EXPIRED</code> indicates that at least <em class="parameter"><code>timeout</code></em> nanoseconds passed and <em class="parameter"><code>sync</code></em> did not

become signaled.

</p>

</li>

<li class="listitem">

<p>

<code class="constant">GL_CONDITION_SATISFIED</code> indicates that <em class="parameter"><code>sync</code></em> was signaled before the timeout expired.

</p>

</li>

<li class="listitem">

<p>

<code class="constant">GL_WAIT_FAILED</code> indicates that an error occurred. Additionally, an OpenGL error will be generated.

</p>

</li>

</ul>

</div>

<p>

</p>

</div>

<div class="refsect1" id="errors">

<h2>Errors</h2>

<p>

<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>sync</code></em> is not the name of an existing sync object.

</p>

<p>

<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>flags</code></em> contains any unsupported flag.

</p>

</div>

{$pipelinestall}{$examples}

<div class="refsect1" id="versions">

<h2>API Version Support</h2>

<div class="informaltable">

<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">

<colgroup>

<col style="text-align: left; "/>

<col style="text-align: center; " class="firstvers"/>

<col style="text-align: center; "/>

<col style="text-align: center; " class="lastvers"/>

</colgroup>

<thead>

<tr>

<th style="text-align: left; border-right: 2px solid ; ">

</th>

<th style="text-align: center; border-bottom: 2px solid ; " colspan="3">

<span class="bold"><strong>OpenGL ES API Version</strong></span>

</th>

</tr>

<tr>

<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>Function Name</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>2.0</strong></span>

</th>

<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.0</strong></span>

</th>

<th style="text-align: center; border-bottom: 2px solid ; ">

<span class="bold"><strong>3.1</strong></span>

</th>

</tr>

</thead>

<tbody>

<tr>

<td style="text-align: left; border-right: 2px solid ; ">glClientWaitSync</td>

<td style="text-align: center; border-right: 2px solid ; ">-</td>

<td style="text-align: center; border-right: 2px solid ; ">✔</td>

<td style="text-align: center; ">✔</td>

</tr>

</tbody>

</table>

</div>

</div>

<div class="refsect1" id="seealso">

<h2>See Also</h2>

<p>

<a class="citerefentry" href="glFenceSync"><span class="citerefentry"><span class="refentrytitle">glFenceSync</span></span></a>,

<a class="citerefentry" href="glIsSync"><span class="citerefentry"><span class="refentrytitle">glIsSync</span></span></a>

<a class="citerefentry" href="glWaitSync"><span class="citerefentry"><span class="refentrytitle">glWaitSync</span></span></a>

</p>

</div>

<div class="refsect1" id="Copyright">

<h2>Copyright</h2>

<p>

Copyright © 2010-2014 Khronos Group.

This material may be distributed subject to the terms and conditions set forth in

the Open Publication License, v 1.0, 8 June 1999.

<a class="link" href="https://opencontent.org/openpub/" target="_top">https://opencontent.org/openpub/</a>.

</p>

</div>

</div>