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Thread-Safety.html
<!DOCTYPE html> <html> <!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for libffi, a portable foreign function interface library. Copyright © 2008-2024 Anthony Green and Red Hat, Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --> <title>Thread Safety (libffi: the portable foreign function interface library)</title> <meta name="description" content="Thread Safety (libffi: the portable foreign function interface library)"> <meta name="keywords" content="Thread Safety (libffi: the portable foreign function interface library)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta name="viewport" content="width=device-width,initial-scale=1"> <link href="index.html" rel="start" title="Top"> <link href="Index.html" rel="index" title="Index"> <link href="Using-libffi.html" rel="up" title="Using libffi"> <link href="Closure-Example.html" rel="prev" title="Closure Example"> <style type="text/css"> <!-- a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em} span:hover a.copiable-link {visibility: visible} ul.mark-bullet {list-style-type: disc} --> </style> </head> <body lang="en"> <div class="section-level-extent" id="Thread-Safety"> <div class="nav-panel"> <p> Previous: <a href="Closure-Example.html" accesskey="p" rel="prev">Closure Example</a>, Up: <a href="Using-libffi.html" accesskey="u" rel="up">Using libffi</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p> </div> <hr> <h3 class="section" id="Thread-Safety-1"><span>2.7 Thread Safety<a class="copiable-link" href="#Thread-Safety-1"> ¶</a></span></h3> <p><code class="code">libffi</code> is not completely thread-safe. However, many parts are, and if you follow some simple rules, you can use it safely in a multi-threaded program. </p> <ul class="itemize mark-bullet"> <li><code class="code">ffi_prep_cif</code> may modify the <code class="code">ffi_type</code> objects passed to it. It is best to ensure that only a single thread prepares a given <code class="code">ffi_cif</code> at a time. </li><li>On some platforms, <code class="code">ffi_prep_cif</code> may modify the size and alignment of some types, depending on the chosen ABI. On these platforms, if you switch between ABIs, you must ensure that there is only one call to <code class="code">ffi_prep_cif</code> at a time. <p>Currently the only affected platform is PowerPC and the only affected type is <code class="code">long double</code>. </p></li></ul> </div> </body> </html>
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