Sophie: sbcl-1.0.31-1mdv2010.0 i586

sbcl-1.0.31-1mdv2010.0.i586.rpm

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<h4 class="subsection">11.1.3 Package Lock Violations</h4>

<p><a name="index-sb_002dext_003apackage_002dlock_002dviolation-386"></a><a name="index-sb_002dext_003apackage_002dlocked_002derror-387"></a><a name="index-sb_002dext_003asymbol_002dpackage_002dlocked_002derror-388"></a><a name="index-package_002dlock_002dviolation-389"></a><a name="index-package_002dlocked_002derror-390"></a><a name="index-symbol_002dpackage_002dlocked_002derror-391"></a><a name="index-package_002derror-392"></a>

<h5 class="subsubsection">11.1.3.1 Lexical Bindings and Declarations</h5>

<p><a name="index-let-393"></a><a name="index-let_002a-394"></a><a name="index-flet-395"></a><a name="index-labels-396"></a><a name="index-macrolet-397"></a><a name="index-symbol_002dmacrolet-398"></a><a name="index-declare-399"></a><a name="index-Declarations-400"></a><a name="index-sb_002dext_003adisable_002dpackage_002dlocks-401"></a><a name="index-sb_002dext_003aenable_002dpackage_002dlocks-402"></a><a name="index-disable_002dpackage_002dlocks-403"></a><a name="index-enable_002dpackage_002dlocks-404"></a>
Lexical bindings or declarations that violate package locks cause
result in a <code>program-error</code> being signalled at when the form that
violates package locks would be executed.

   <p>A complete listing of operators affect by this is: <code>let</code>,
<code>let*</code>, <code>flet</code>, <code>labels</code>, <code>macrolet</code>, and
<code>symbol-macrolet</code>, <code>declare</code>.

   <p>Package locks affecting both lexical bindings and declarations can be
disabled locally with <code>sb-ext:disable-package-locks</code> declaration,
and re-enabled with <code>sb-ext:enable-package-locks</code> declaration.

   <p>Example:

<pre class="lisp">     (in-package :locked)
     
     (defun foo () ...)
     
     (defmacro with-foo (&amp;body body)
       `(locally (declare (disable-package-locks locked:foo))
          (flet ((foo () ...))
            (declare (enable-package-locks locked:foo)) ; re-enable for body
            ,@body)))
</pre>
   <h5 class="subsubsection">11.1.3.2 Other Operations</h5>

<p>If an non-lexical operation violates a package lock, a continuable
error that is of a subtype of <code>sb-ext:package-lock-violation</code>
(subtype of <code>package-error</code>) is signalled when the operation is
attempted.

   <p>Additional restarts may be established for continuable package lock
violations for interactive use.

   <p>The actual type of the error depends on circumstances that caused the
violation: operations on packages signal errors of type
<code>sb-ext:package-locked-error</code>, and operations on symbols signal
errors of type <code>sb-ext:symbol-package-locked-error</code>.

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