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-<title>Apache 2.0 Thread Safety Issues - Apache HTTP Server</title>
+<title>Apache HTTP Server 2.x Thread Safety Issues - Apache HTTP Server</title>
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-<p class="apache">Apache HTTP Server Version 2.3</p>
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+<p class="apache">Apache HTTP Server Version 2.5</p>
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-<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.3</a> > <a href="./">Developer Documentation</a></div><div id="page-content"><div id="preamble"><h1>Apache 2.0 Thread Safety Issues</h1>
+<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Developer Documentation</a></div><div id="page-content"><div id="preamble"><h1>Apache HTTP Server 2.x Thread Safety Issues</h1>
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- <p>When using any of the threaded mpms in Apache 2.0 it is important
+ <p>When using any of the threaded mpms in the Apache HTTP Server 2.x 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
+ either as thread safety problems can lead to subtle race conditions that
may only show up in certain conditions under heavy load.</p>
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<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#variables">Global and static variables</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#functions">Common standard troublesome functions</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#commonlibs">Common 3rd Party Libraries</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#liblist">Library List</a></li>
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<h2><a name="variables" id="variables">Global and static variables</a></h2>
allowed to use static or global variables. There are times when you
actually want something to affect all threads, but generally you need to
avoid using them if you want your code to be thread safe.</p>
-
+
<p>In the case where you have a global variable that needs to be global and
accessed by all threads, be very careful when you update it. If, for
example, it is an incrementing counter, you need to atomically increment
to their <code><var>*</var>_r</code> equivalents and sometimes changes
the common <code>getc</code>/<code>putc</code> macros into safer function
calls. Check your libc documentation for specifics. Instead of, or in
- addition to <code>_REENTRANT</code> the symbols that may affect this are
+ addition to <code>_REENTRANT</code> the symbols that may affect this are
<code>_POSIX_C_SOURCE</code>, <code>_THREAD_SAFE</code>,
<code>_SVID_SOURCE</code>, and <code>_BSD_SOURCE</code>.</p>
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