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<h3>
Raymond Toy pushed to branch issue-122-dynamically-allocate-altstack
at <a href="https://gitlab.common-lisp.net/cmucl/cmucl">cmucl / cmucl</a>
</h3>
<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/e6dd7ca518562373e4a1bf673bfa673d46fa2dd6">e6dd7ca5</a></strong>
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<span>by Raymond Toy</span>
<i>at 2022-01-30T15:40:37-08:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Only allocate altstack once.
Initialize altstack to NULL, so that we can tell if we need to
allocate space for it.
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<h4>1 changed file:</h4>
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<a href="#545a9ba33baa3fc4daaa9eb69fae27a68aeb3d79">
src/lisp/interrupt.c
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<h4>Changes:</h4>
<li id="545a9ba33baa3fc4daaa9eb69fae27a68aeb3d79">
<a href="https://gitlab.common-lisp.net/cmucl/cmucl/-/commit/e6dd7ca518562373e4a1bf673bfa673d46fa2dd6#545a9ba33baa3fc4daaa9eb69fae27a68aeb3d79"><strong>src/lisp/interrupt.c</strong></a>
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<td class="line_content match" style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -406,7 +406,7 @@ interrupt_maybe_gc(HANDLER_ARGS)</td>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">\****************************************************************/</span></span>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(__linux__)</span></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">char</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">altstack</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">char</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">altstack</span><span class="idiff left addition"> </span><span class="o" style="font-weight: 600;"><span class="idiff addition">=</span></span><span class="idiff addition"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right addition">NULL</span></span><span class="p">;</span></span>
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410
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="n" style="color: #333;">altstack</span><span class="p">[</span><span class="n" style="color: #333;">SIGNAL_STACK_SIZE</span><span class="p">];</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<td class="line_content match" style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -436,7 +436,14 @@ interrupt_install_low_level_handler(int signal, void handler(HANDLER_ARGS))</td>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="c"> <span class="n" style="color: #333;">sigstack</span><span class="p">.</span><span class="n" style="color: #333;">ss_sp</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">SIGNAL_STACK_START</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(__linux__)</span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="c"> <span class="n" style="color: #333;">altstack</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">malloc</span><span class="p">(</span><span class="n" style="color: #333;">SIGSTKSZ</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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<pre style="margin: 0;">+<span id="LC440" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * For gcc 11.2 (clang 13.0), we need to allocate altstack</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * dynamically. Do this here, but only if we haven't already</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * allocated space.</span></span>
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<pre style="margin: 0;">+<span id="LC443" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC444" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">altstack</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC445" class="line" lang="c"> <span class="n" style="color: #333;">altstack</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">malloc</span><span class="p">(</span><span class="n" style="color: #333;">SIGSTKSZ</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC446" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC447" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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<pre style="margin: 0;"> <span id="LC448" class="line" lang="c"> <span class="n" style="color: #333;">sigstack</span><span class="p">.</span><span class="n" style="color: #333;">ss_sp</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">altstack</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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