133 lines
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133 lines
8.2 KiB
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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<title>SRFI-18 Exceptions (Guile Reference Manual)</title>
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<div class="subsubsection-level-extent" id="SRFI_002d18-Exceptions">
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<p>
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Previous: <a href="SRFI_002d18-Time.html" accesskey="p" rel="prev">SRFI-18 Time</a>, Up: <a href="SRFI_002d18.html" accesskey="u" rel="up">SRFI-18 - Multithreading support</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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<h4 class="subsubsection" id="SRFI_002d18-Exceptions-1"><span>7.5.15.5 SRFI-18 Exceptions<a class="copiable-link" href="#SRFI_002d18-Exceptions-1"> ¶</a></span></h4>
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<p>SRFI-18 exceptions are identical to the exceptions provided by
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Guile’s implementation of SRFI-34. The behavior of exception
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handlers invoked to handle exceptions thrown from SRFI-18 functions,
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however, differs from the conventional behavior of SRFI-34 in that
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the continuation of the handler is the same as that of the call to
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the function. Handlers are called in a tail-recursive manner; the
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exceptions do not “bubble up”.
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</p>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-current_002dexception_002dhandler"><span class="category-def">Function: </span><span><strong class="def-name">current-exception-handler</strong><a class="copiable-link" href="#index-current_002dexception_002dhandler"> ¶</a></span></dt>
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<dd><p>Returns the current exception handler.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-with_002dexception_002dhandler-1"><span class="category-def">Function: </span><span><strong class="def-name">with-exception-handler</strong> <var class="def-var-arguments">handler thunk</var><a class="copiable-link" href="#index-with_002dexception_002dhandler-1"> ¶</a></span></dt>
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<dd><p>Installs <var class="var">handler</var> as the current exception handler and calls the
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procedure <var class="var">thunk</var> with no arguments, returning its value as the
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value of the exception. <var class="var">handler</var> must be a procedure that accepts
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a single argument. The current exception handler at the time this
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procedure is called will be restored after the call returns.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-raise-1"><span class="category-def">Function: </span><span><strong class="def-name">raise</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-raise-1"> ¶</a></span></dt>
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<dd><p>Raise <var class="var">obj</var> as an exception. This is the same procedure as the
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same-named procedure defined in SRFI 34.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-join_002dtimeout_002dexception_003f"><span class="category-def">Function: </span><span><strong class="def-name">join-timeout-exception?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-join_002dtimeout_002dexception_003f"> ¶</a></span></dt>
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<dd><p>Returns <code class="code">#t</code> if <var class="var">obj</var> is an exception raised as the result of
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performing a timed join on a thread that does not exit within the
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specified timeout, <code class="code">#f</code> otherwise.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-abandoned_002dmutex_002dexception_003f"><span class="category-def">Function: </span><span><strong class="def-name">abandoned-mutex-exception?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-abandoned_002dmutex_002dexception_003f"> ¶</a></span></dt>
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<dd><p>Returns <code class="code">#t</code> if <var class="var">obj</var> is an exception raised as the result of
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attempting to lock a mutex that has been abandoned by its owner thread,
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<code class="code">#f</code> otherwise.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-terminated_002dthread_002dexception_003f"><span class="category-def">Function: </span><span><strong class="def-name">terminated-thread-exception?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-terminated_002dthread_002dexception_003f"> ¶</a></span></dt>
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<dd><p>Returns <code class="code">#t</code> if <var class="var">obj</var> is an exception raised as the result of
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joining on a thread that exited as the result of a call to
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<code class="code">thread-terminate!</code>.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-uncaught_002dexception_003f"><span class="category-def">Function: </span><span><strong class="def-name">uncaught-exception?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-uncaught_002dexception_003f"> ¶</a></span></dt>
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<dt class="deffnx defunx-alias-deffnx def-cmd-deffn" id="index-uncaught_002dexception_002dreason"><span class="category-def">Function: </span><span><strong class="def-name">uncaught-exception-reason</strong> <var class="def-var-arguments">exc</var><a class="copiable-link" href="#index-uncaught_002dexception_002dreason"> ¶</a></span></dt>
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<dd><p><code class="code">uncaught-exception?</code> returns <code class="code">#t</code> if <var class="var">obj</var> is an
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exception thrown as the result of joining a thread that exited by
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raising an exception that was handled by the top-level exception
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handler installed by <code class="code">make-thread</code>. When this occurs, the
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original exception is preserved as part of the exception thrown by
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<code class="code">thread-join!</code> and can be accessed by calling
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<code class="code">uncaught-exception-reason</code> on that exception. Note that
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because this exception-preservation mechanism is a side-effect of
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<code class="code">make-thread</code>, joining on threads that exited as described above
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but were created by other means will not raise this
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<code class="code">uncaught-exception</code> error.
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</p></dd></dl>
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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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Previous: <a href="SRFI_002d18-Time.html">SRFI-18 Time</a>, Up: <a href="SRFI_002d18.html">SRFI-18 - Multithreading support</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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