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  <div class="section" id="overview-of-firebird-client-library-thread-safety">
<h1>Overview of Firebird Client Library Thread-Safety<a class="headerlink" href="#overview-of-firebird-client-library-thread-safety" title="Permalink to this headline"></a></h1>
<p>The thread-safety properties of the standard Firebird client library
vary according to the following:</p>
<ul class="simple">
<li>Firebird version</li>
<li>operating system</li>
<li>Firebird server architecture (SuperServer, Classic, Embedded)</li>
<li>underlying connection protocol (embedded vs. local vs. IPC vs.
remote)</li>
</ul>
<p>Determining whether the client library you&#8217;re using is thread-safe can
be quite confusing. This document aims to reduce that confusion by
defining what thread-safety means in the context of the Firebird
client library, then presenting a table that specifies which client
library configurations are thread-safe.</p>
<p>Note that this document deals only with the <em>standard</em> Firebird client
library that underlies the Firebird C API. It has <em>no relevance</em> to
the clean-slate reimplementations in access libraries such as Jaybird.</p>
<div class="section" id="definition-of-thread-safety">
<h2>Definition of &#8220;Thread-Safety&#8221;<a class="headerlink" href="#definition-of-thread-safety" title="Permalink to this headline"></a></h2>
<p>Currently, the highest level of concurrency supported by any version
of the Firebird client library is <em>thread-safety at the connection
level</em>.</p>
<p>When we say that the Firebird client library is <em>thread-safe at the
connection level</em>, we mean that it is safe to use a particular
connection in only one thread at a time, although the same connection
can be manipulated by different threads in a serial fashion, and
different connections can be manipulated by different threads in
parallel.</p>
<p>For example, in a multithreaded application server, it is safe for a
particular connection to be leased from a connection pool by Thread A,
used, and returned to the pool for later lease by Thread B. It is not
safe for Thread A and Thread B to use the same connection at the same
time.</p>
</div>
<div class="section" id="thread-safety-table">
<h2>Thread-Safety Table<a class="headerlink" href="#thread-safety-table" title="Permalink to this headline"></a></h2>
<table border="1" class="docutils">
<colgroup>
<col width="16%" />
<col width="12%" />
<col width="23%" />
<col width="22%" />
<col width="27%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">FB Version</th>
<th class="head">OS</th>
<th class="head">FB Architecture</th>
<th class="head">Remote / Local</th>
<th class="head">Thread-Safe?</th>
</tr>
</thead>
<tbody valign="top">
<tr><td rowspan="10">1.0.3</td>
<td rowspan="6">Windows</td>
<td rowspan="2">SuperServer</td>
<td>Local</td>
<td>No</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Classic</td>
<td>Local</td>
<td>No such config.</td>
</tr>
<tr><td>Remote</td>
<td>No such config.</td>
</tr>
<tr><td rowspan="2">Embedded</td>
<td>Local</td>
<td>No such config.</td>
</tr>
<tr><td>Remote</td>
<td>No such config.</td>
</tr>
<tr><td rowspan="4">Linux</td>
<td rowspan="2">SuperServer</td>
<td>Local</td>
<td>No such config.</td>
</tr>
<tr><td>Remote</td>
<td>No</td>
</tr>
<tr><td rowspan="2">Classic</td>
<td>Local</td>
<td>No</td>
</tr>
<tr><td>Remote</td>
<td>No</td>
</tr>
<tr><td rowspan="10">1.5</td>
<td rowspan="6">Windows</td>
<td rowspan="2">SuperServer</td>
<td>Local</td>
<td>No</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Classic</td>
<td>Local</td>
<td>No such config.</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Embedded</td>
<td>Local</td>
<td>Yes</td>
</tr>
<tr><td>Remote</td>
<td>No such config.</td>
</tr>
<tr><td rowspan="4">Linux</td>
<td rowspan="2">SuperServer</td>
<td>Local</td>
<td>No such config.</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Classic</td>
<td>Local</td>
<td>No</td>
</tr>
<tr><td>Remote</td>
<td>No</td>
</tr>
<tr><td rowspan="10">2.0/2.1</td>
<td rowspan="6">Windows</td>
<td rowspan="2">SuperServer</td>
<td>Local</td>
<td>Yes</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Classic</td>
<td>Local</td>
<td>Yes</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Embedded</td>
<td>Local</td>
<td>Yes</td>
</tr>
<tr><td>Remote</td>
<td>No such config.</td>
</tr>
<tr><td rowspan="4">Linux</td>
<td rowspan="2">SuperServer</td>
<td>Local</td>
<td>No such config.</td>
</tr>
<tr><td>Remote</td>
<td>Yes</td>
</tr>
<tr><td rowspan="2">Classic</td>
<td>Local</td>
<td>No</td>
</tr>
<tr><td>Remote</td>
<td>No</td>
</tr>
</tbody>
</table>
<p>This document was written by David Rushby, with assistance from Dmitry
Yemanov. Errors are attributable to Rushby rather than Yemanov.</p>
</div>
</div>


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            <ul>
<li><a class="reference external" href="">Overview of Firebird Client Library Thread-Safety</a><ul>
<li><a class="reference external" href="#definition-of-thread-safety">Definition of &#8220;Thread-Safety&#8221;</a></li>
<li><a class="reference external" href="#thread-safety-table">Thread-Safety Table</a></li>
</ul>
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