100 lines
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100 lines
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HTML
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>Modules and the File System (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Modules.html" rel="up" title="Modules">
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<link href="R6RS-Version-References.html" rel="next" title="R6RS Version References">
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<div class="subsection-level-extent" id="Modules-and-the-File-System">
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<p>
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Next: <a href="R6RS-Version-References.html" accesskey="n" rel="next">R6RS Version References</a>, Previous: <a href="Creating-Guile-Modules.html" accesskey="p" rel="prev">Creating Guile Modules</a>, Up: <a href="Modules.html" accesskey="u" rel="up">Modules</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
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<h4 class="subsection" id="Modules-and-the-File-System-1"><span>6.18.4 Modules and the File System<a class="copiable-link" href="#Modules-and-the-File-System-1"> ¶</a></span></h4>
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<p>Typical programs only use a small subset of modules installed on a Guile
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system. In order to keep startup time down, Guile only loads modules
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when a program uses them, on demand.
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</p>
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<p>When a program evaluates <code class="code">(use-modules (ice-9 popen))</code>, and the
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module is not loaded, Guile searches for a conventionally-named file
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in the <em class="dfn">load path</em>.
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</p>
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<p>In this case, loading <code class="code">(ice-9 popen)</code> will eventually cause Guile
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to run <code class="code">(primitive-load-path "ice-9/popen")</code>.
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<code class="code">primitive-load-path</code> will search for a file <samp class="file">ice-9/popen</samp> in
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the <code class="code">%load-path</code> (see <a class="pxref" href="Load-Paths.html">Load Paths</a>). For each directory in
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<code class="code">%load-path</code>, Guile will try to find the file name, concatenated
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with the extensions from <code class="code">%load-extensions</code>. By default, this will
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cause Guile to <code class="code">stat</code> <samp class="file">ice-9/popen.scm</samp>, and then
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<samp class="file">ice-9/popen</samp>. See <a class="xref" href="Load-Paths.html">Load Paths</a>, for more on
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<code class="code">primitive-load-path</code>.
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</p>
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<p>If a corresponding compiled <samp class="file">.go</samp> file is found in the
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<code class="code">%load-compiled-path</code> or in the fallback path, and is as fresh as
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the source file, it will be loaded instead of the source file. If no
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compiled file is found, Guile may try to compile the source file and
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cache away the resulting <samp class="file">.go</samp> file. See <a class="xref" href="Compilation.html">Compiling Scheme Code</a>, for more
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on compilation.
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</p>
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<p>Once Guile finds a suitable source or compiled file is found, the file
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will be loaded. If, after loading the file, the module under
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consideration is still not defined, Guile will signal an error.
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</p>
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<p>For more information on where and how to install Scheme modules,
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See <a class="xref" href="Installing-Site-Packages.html">Installing Site Packages</a>.
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</p>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="R6RS-Version-References.html">R6RS Version References</a>, Previous: <a href="Creating-Guile-Modules.html">Creating Guile Modules</a>, Up: <a href="Modules.html">Modules</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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