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<h3 class="section">2.2 Extensions</h3>
<p>SBCL comes with numerous extensions, some in core and some in modules
loadable with <code>require</code>. Unfortunately, not all of these
extensions have proper documentation yet.
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<dl>
<dt><strong>System Definition Tool</strong><dd><code>asdf</code> is a flexible and popular protocol-oriented system
definition tool by Daniel Barlow. see <a href="../asdf/index.html#Top">the asdf manual</a>, for
more information.
<br><dt><strong>Third-party Extension Installation Tool</strong><dd><code>asdf-install</code> is a tool that can be used to download and install
third-party libraries and applications, automatically handling
dependencies, etc.
<br><dt><strong>Foreign Function Interface</strong><dd><code>sb-alien</code> package allows interfacing with C-code, loading shared
object files, etc. See <a href="Foreign-Function-Interface.html#Foreign-Function-Interface">Foreign Function Interface</a>.
<p><code>sb-grovel</code> can be used to partially automate generation of
foreign function interface definitions. See <a href="sb_002dgrovel.html#sb_002dgrovel">sb-grovel</a>.
<br><dt><strong>Recursive Event Loop</strong><dd>SBCL provides a recursive event loop (<code>serve-event</code>) for doing
non-blocking IO on multiple streams without using threads.
<br><dt><strong>Metaobject Protocol</strong><dd><code>sb-mop</code> package provides a metaobject protocol for the Common
Lisp Object System as described in <cite>Art of Metaobject Protocol</cite>.
<br><dt><strong>Native Threads</strong><dd>SBCL has native threads on x86/Linux, capable of taking advantage
of SMP on multiprocessor machines. See <a href="Threading.html#Threading">Threading</a>.
<br><dt><strong>Network Interface</strong><dd><code>sb-bsd-sockets</code> is a low-level networking interface, providing
both TCP and UDP sockets. See <a href="Networking.html#Networking">Networking</a>.
<br><dt><strong>Introspective Facilities</strong><dd><code>sb-introspect</code> module offers numerous introspective extensions,
including access to function lambda-lists and a cross referencing
facility.
<br><dt><strong>Operating System Interface</strong><dd><code>sb-ext</code> contains a number of functions for running external
processes, accessing environment variables, etc.
<p><code>sb-posix</code> module provides a lispy interface to standard POSIX
facilities.
<br><dt><strong>Extensible Streams</strong><dd><code>sb-gray</code> is an implementation of <em>Gray Streams</em>. See <a href="Gray-Streams.html#Gray-Streams">Gray Streams</a>.
<p><code>sb-simple-streams</code> is an implementation of the <em>simple
streams</em> API proposed by Franz Inc. See <a href="Simple-Streams.html#Simple-Streams">Simple Streams</a>.
<br><dt><strong>Profiling</strong><dd><code>sb-profile</code> is a exact per-function profiler. See <a href="Deterministic-Profiler.html#Deterministic-Profiler">Deterministic Profiler</a>.
<p><code>sb-sprof</code> is a statistical profiler, capable of call-graph
generation and instruction level profiling, which also supports
allocation profiling. See <a href="Statistical-Profiler.html#Statistical-Profiler">Statistical Profiler</a>.
<br><dt><strong>Customization Hooks</strong><dd>SBCL contains a number of extra-standard customization hooks that
can be used to tweak the behaviour of the system. See <a href="Customization-Hooks-for-Users.html#Customization-Hooks-for-Users">Customization Hooks for Users</a>.
<p><code>sb-aclrepl</code> provides an Allegro CL -style toplevel for SBCL,
as an alternative to the classic CMUCL-style one. See <a href="sb_002daclrepl.html#sb_002daclrepl">sb-aclrepl</a>.
<br><dt><strong>CLTL2 Compatility Layer</strong><dd><code>sb-cltl2</code> module provides <code>compiler-let</code> and environment
access functionality described in <cite>Common Lisp The Language, 2nd
Edition</cite> which were removed from the language during the ANSI
standardization process.
<br><dt><strong>Executable Delivery</strong><dd>The <code>:executable</code> argument to <a href="Function-sb_002dext_003asave_002dlisp_002dand_002ddie.html#Function-sb_002dext_003asave_002dlisp_002dand_002ddie">Function sb-ext:save-lisp-and-die</a> can produce a `standalone' executable
containing both an image of the current Lisp session and an SBCL
runtime.
<br><dt><strong>Bitwise Rotation</strong><dd><code>sb-rotate-byte</code> provides an efficient primitive for bitwise
rotation of integers, an operation required by eg. numerous
cryptographic algorithms, but not available as a primitive in ANSI
Common Lisp. See <a href="sb_002drotate_002dbyte.html#sb_002drotate_002dbyte">sb-rotate-byte</a>.
<br><dt><strong>Test Harness</strong><dd><code>sb-rt</code> module is a simple yet attractive regression and
unit-test framework.
<br><dt><strong>MD5 Sums</strong><dd><code>sb-md5</code> is an implementation of the MD5 message digest algorithm
for Common Lisp, using the modular arithmetic optimizations provided
by SBCL. See <a href="sb_002dmd5.html#sb_002dmd5">sb-md5</a>.
</dl>
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