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- <title>Apache 2.0 Thread Safety Issues</title>
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- <h1>Thread Safety</h1>
- <p>When using any of the threaded mpms in Apache 2.0 it is important
- that every function called from Apache be thread safe. When linking in 3rd
- party extensions it can be difficult to determine whether the resulting
- server will be thread safe. Casual testing generally won't tell you this
- either as thread safety problems can lead to subtle race conditons that
- may only show up in certain conditions under heavy load.</p>
-
- <h1>Common 3rd Party Libraries</h1>
- <p>The following is a list of common libraries that are used by 3rd party
- Apache modules. You can check to see if your module is using a potentially
- unsafe library by using tools such as <tt>ldd</tt> and <tt>nm</tt>. For
- PHP, for example, try this:</p>
-<pre>% ldd libphp4.so
-libsablot.so.0 => /usr/local/lib/libsablot.so.0 (0x401f6000)
-libexpat.so.0 => /usr/lib/libexpat.so.0 (0x402da000)
-libsnmp.so.0 => /usr/lib/libsnmp.so.0 (0x402f9000)
-libpdf.so.1 => /usr/local/lib/libpdf.so.1 (0x40353000)
-libz.so.1 => /usr/lib/libz.so.1 (0x403e2000)
-libpng.so.2 => /usr/lib/libpng.so.2 (0x403f0000)
-libmysqlclient.so.11 => /usr/lib/libmysqlclient.so.11 (0x40411000)
-libming.so => /usr/lib/libming.so (0x40449000)
-libm.so.6 => /lib/libm.so.6 (0x40487000)
-libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0x404a8000)
-libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0x404e7000)
-libcrypt.so.1 => /lib/libcrypt.so.1 (0x40505000)
-libssl.so.2 => /lib/libssl.so.2 (0x40532000)
-libcrypto.so.2 => /lib/libcrypto.so.2 (0x40560000)
-libresolv.so.2 => /lib/libresolv.so.2 (0x40624000)
-libdl.so.2 => /lib/libdl.so.2 (0x40634000)
-libnsl.so.1 => /lib/libnsl.so.1 (0x40637000)
-libc.so.6 => /lib/libc.so.6 (0x4064b000)
-/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)</pre>
-<p>In addition to these libraries you will need to have a look at any libraries
-linked statically into the module. You can use <tt>nm</tt> to look for
-individual symbols in the module.</p>
-
- <h2>Library List</h2>
- <p>Please drop a note to dev@httpd.apache.org if you have additions or
- corrections to this list.</p>
- <table>
- <tr>
- <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>
- <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>?</td>
- <td> </td>
- </tr>
- <tr>
- <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>?</td>
- <td> </td>
- </tr>
- <tr>
- <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>
- <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>
- <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>
- <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 gdbm_error variable</td>
- </tr>
- <tr>
- <td><a href="http://www.imagemagick.org/">ImageMagick</a></td>
- <td> </td>
- <td>?</td>
- <td> </td>
- </tr>
- <tr>
- <td><a href="http://www.enlightenment.org/pages/imlib2.html">Imlib2</a></td>
- <td> </td>
- <td>?</td>
- <td> </td>
- </tr>
- <tr>
- <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>?</td>
- <td> </td>
- </tr>
- <tr>
- <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>
- <td><a href="http://www.openldap.org/">OpenLDAP</a></td>
- <td>2.1.x</td>
- <td>?</td>
- <td> </td>
- </tr>
- <tr>
- <td><a href="http://www.openssl.org/">OpenSSL</a></td>
- <td>0.96g</td>
- <td>?</td>
- <td> </td>
- </tr>
- <tr>
- <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>4.0.x</td>
- <td>?</td>
- <td> </td>
- </tr>
- <tr>
- <td><a href="http://www.libpng.org/pub/png/libpng.html">libpng</a></td>
- <td>1.0.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>
- <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 crypt() 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></td>
- </tr>
- <tr>
- <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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