thread_safety.html.en

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<h2><a name="liblist" id="liblist">Library List</a></h2>
    <p>Please drop a note to <a href="http://httpd.apache.org/lists.html#http-dev">[e-mail]</a>
    if you have additions or corrections to this list.</p>

    <table class="bordered"><tr class="header"><th>Library</th><th>Version</th><th>Thread Safe?</th><th>Notes</th></tr>
<tr><td><a href="http://aspell.sourceforge.net/">ASpell/PSpell</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://www.sleepycat.com/">Berkeley DB</a></td>
        <td>3.x, 4.x</td>
        <td>Yes</td>
        <td>Be careful about sharing a connection across threads.</td></tr>
<tr><td><a href="http://sources.redhat.com/bzip2/index.html">bzip2</a></td>
        <td> </td>
        <td>Yes</td>
        <td>Both low-level and high-level APIs are thread-safe. However,
        high-level API requires thread-safe access to errno.</td></tr>
<tr class="odd"><td><a href="http://cr.yp.to/cdb.html">cdb</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://www.washington.edu/imap/">C-Client</a></td>
        <td> </td>
        <td>Perhaps</td>
        <td>c-client uses <code>strtok()</code> and
        <code>gethostbyname()</code> which are not thread-safe on most C
        library implementations.  c-client's static data is meant to be shared
        across threads. If <code>strtok()</code> and
        <code>gethostbyname()</code> are thread-safe on your OS, c-client
        <em>may</em> be thread-safe.</td></tr>
<tr class="odd"><td><a href="http://www.fastio.com/">cpdflib</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://www.ijg.org/files/">libcrypt</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://expat.sourceforge.net/">Expat</a></td>
        <td> </td>
        <td>Yes</td>
        <td>Need a separate parser instance per thread</td></tr>
<tr><td><a href="http://www.freetds.org/">FreeTDS</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://www.freetype.org/">FreeType</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://www.boutell.com/gd/">GD 1.8.x</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://www.boutell.com/gd/">GD 2.0.x</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://www.gnu.org/software/gdbm/gdbm.html">gdbm</a></td>
        <td> </td>
        <td>No</td>
        <td>Errors returned via a static <code>gdbm_error</code>
        variable</td></tr>
<tr class="odd"><td><a href="http://www.imagemagick.org/">ImageMagick</a></td>
        <td>5.2.2</td>
        <td>Yes</td>
        <td>ImageMagick docs claim it is thread safe since version 5.2.2 (see <a href="http://www.cise.ufl.edu/depot/www/ImageMagick/www/Changelog.html">Change log</a>).
        </td></tr>
<tr><td><a href="http://www.enlightenment.org/pages/imlib2.html">Imlib2</a></td>
        <td> </td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://www.ijg.org/files/">libjpeg</a></td>
        <td>v6b</td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://mysql.com">libmysqlclient</a></td>
        <td> </td>
        <td>Yes</td>
        <td>Use mysqlclient_r library variant to ensure thread-safety.  For
            more information, please read <a href="http://www.mysql.com/doc/en/Threaded_clients.html">http://www.mysql.com/doc/en/Threaded_clients.html</a>.</td></tr>
<tr class="odd"><td><a href="http://www.opaque.net/ming/">Ming</a></td>
        <td>0.2a</td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://net-snmp.sourceforge.net/">Net-SNMP</a></td>
        <td>5.0.x</td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://www.openldap.org/">OpenLDAP</a></td>
        <td>2.1.x</td>
        <td>Yes</td>
        <td>Use <code>ldap_r</code> library variant to ensure
        thread-safety.</td></tr>
<tr><td><a href="http://www.openssl.org/">OpenSSL</a></td>
        <td>0.9.6g</td>
        <td>Yes</td>
        <td>Requires proper usage of <code>CRYPTO_num_locks</code>,
        <code>CRYPTO_set_locking_callback</code>,
        <code>CRYPTO_set_id_callback</code></td></tr>
<tr class="odd"><td><a href="http://www.oracle.com/">liboci8 (Oracle 8+)</a></td>
        <td>8.x,9.x</td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://pdflib.com/">pdflib</a></td>
        <td>5.0.x</td>
        <td>Yes</td>
        <td>PDFLib docs claim it is thread safe; changes.txt indicates it
            has been partially thread-safe since V1.91: <a href="http://www.pdflib.com/products/pdflib/index.html">http://www.pdflib.com/products/pdflib/index.html</a>.</td></tr>
<tr class="odd"><td><a href="http://www.libpng.org/pub/png/libpng.html">libpng</a></td>
        <td>1.0.x</td>
        <td>?</td>
        <td> </td></tr>
<tr><td><a href="http://www.libpng.org/pub/png/libpng.html">libpng</a></td>
        <td>1.2.x</td>
        <td>?</td>
        <td> </td></tr>
<tr class="odd"><td><a href="http://www.postgresql.org/idocs/index.php?libpq-threading.html">libpq (PostgreSQL)</a></td>
        <td>7.x</td>
        <td>Yes</td>
        <td>Don't share connections across threads and watch out for
        <code>crypt()</code> calls</td></tr>
<tr><td><a href="http://www.gingerall.com/charlie/ga/xml/p_sab.xml">Sablotron</a></td>
        <td>0.95</td>
        <td>?</td>
        <td /></tr>
<tr class="odd"><td><a href="http://www.gzip.org/zlib/">zlib</a></td>
        <td>1.1.4</td>
        <td>Yes</td>
        <td>Relies upon thread-safe zalloc and zfree functions  Default is to
        use libc's calloc/free which are thread-safe.</td></tr>
</table>
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