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<title>Struct fcontext_t and related functions</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="context.context.boost_fcontext"></a><a class="link" href="boost_fcontext.html" title="Struct fcontext_t and related functions">Struct <code class="computeroutput"><span class="identifier">fcontext_t</span></code> and related functions</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">stack_t</span>
<span class="special">{</span>
<span class="keyword">void</span> <span class="special">*</span> <span class="identifier">base</span><span class="special">;</span>
<span class="keyword">void</span> <span class="special">*</span> <span class="identifier">limit</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">struct</span> <span class="identifier">fcontext_t</span>
<span class="special">{</span>
<span class="special"><</span> <span class="identifier">platform</span> <span class="identifier">specific</span> <span class="special">></span>
<span class="identifier">stack_t</span> <span class="identifier">fc_stack</span><span class="special">;</span>
<span class="special">};</span>
<span class="identifier">intptr_t</span> <span class="identifier">jump_fcontext</span><span class="special">(</span> <span class="identifier">fcontext_t</span> <span class="special">*</span> <span class="identifier">ofc</span><span class="special">,</span> <span class="identifier">fcontext_t</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">nfc</span><span class="special">,</span> <span class="identifier">intptr_t</span> <span class="identifier">vp</span><span class="special">);</span>
<span class="keyword">void</span> <span class="identifier">make_fcontext</span><span class="special">(</span> <span class="identifier">fcontext_t</span> <span class="special">*</span> <span class="identifier">fc</span><span class="special">,</span> <span class="keyword">void</span><span class="special">(*</span> <span class="identifier">fn</span><span class="special">)(</span><span class="identifier">intptr_t</span><span class="special">)</span> <span class="special">);</span>
</pre>
<h5>
<a name="context.context.boost_fcontext.h0"></a>
<span><a name="context.context.boost_fcontext._code__phrase_role__identifier__base__phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__identifier__base__phrase___code_"><code class="computeroutput"><span class="identifier">base</span></code></a>
</h5>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">Member:</span></dt>
<dd><p>
Pointer to the top of the stack.
</p></dd>
</dl>
</div>
<h5>
<a name="context.context.boost_fcontext.h1"></a>
<span><a name="context.context.boost_fcontext._code__phrase_role__identifier__limit__phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__identifier__limit__phrase___code_"><code class="computeroutput"><span class="identifier">limit</span></code></a>
</h5>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">Member:</span></dt>
<dd><p>
Pointer to the bottom of the stack.
</p></dd>
</dl>
</div>
<h5>
<a name="context.context.boost_fcontext.h2"></a>
<span><a name="context.context.boost_fcontext._code__phrase_role__identifier__fc_stack__phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__identifier__fc_stack__phrase___code_"><code class="computeroutput"><span class="identifier">fc_stack</span></code></a>
</h5>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">Member:</span></dt>
<dd><p>
Tracks the memory for the context's stack.
</p></dd>
</dl>
</div>
<h5>
<a name="context.context.boost_fcontext.h3"></a>
<span><a name="context.context.boost_fcontext._code__phrase_role__identifier__intptr_t__phrase___phrase_role__identifier__jump_fcontext__phrase__phrase_role__special_____phrase___phrase_role__identifier__fcontext_t__phrase___phrase_role__special_____phrase___phrase_role__identifier__ofc__phrase__phrase_role__special_____phrase___phrase_role__identifier__fcontext_t__phrase___phrase_role__special_____phrase___phrase_role__identifier__nfc__phrase__phrase_role__special_____phrase___phrase_role__identifier__intptr_t__phrase___phrase_role__identifier__p__phrase__phrase_role__special_____phrase___phrase_role__keyword__bool__phrase___phrase_role__identifier__preserve_fpu__phrase__phrase_role__special_____phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__identifier__intptr_t__phrase___phrase_role__identifier__jump_fcontext__phrase__phrase_role__special_____phrase___phrase_role__identifier__fcontext_t__phrase___phrase_role__special_____phrase___phrase_role__identifier__ofc__phrase__phrase_role__special_____phrase___phrase_role__identifier__fcontext_t__phrase___phrase_role__special_____phrase___phrase_role__identifier__nfc__phrase__phrase_role__special_____phrase___phrase_role__identifier__intptr_t__phrase___phrase_role__identifier__p__phrase__phrase_role__special_____phrase___phrase_role__keyword__bool__phrase___phrase_role__identifier__preserve_fpu__phrase__phrase_role__special_____phrase___code_"><code class="computeroutput"><span class="identifier">intptr_t</span> <span class="identifier">jump_fcontext</span><span class="special">(</span> <span class="identifier">fcontext_t</span>
<span class="special">*</span> <span class="identifier">ofc</span><span class="special">,</span> <span class="identifier">fcontext_t</span>
<span class="special">*</span> <span class="identifier">nfc</span><span class="special">,</span> <span class="identifier">intptr_t</span> <span class="identifier">p</span><span class="special">,</span> <span class="keyword">bool</span>
<span class="identifier">preserve_fpu</span><span class="special">)</span></code></a>
</h5>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">Effects:</span></dt>
<dd><p>
Stores the current context data (stack pointer, instruction pointer,
and CPU registers) to <code class="computeroutput"><span class="special">*</span><span class="identifier">ofc</span></code> and restores the context data
from <code class="computeroutput"><span class="special">*</span><span class="identifier">nfc</span></code>,
which implies jumping to <code class="computeroutput"><span class="special">*</span><span class="identifier">nfc</span></code>'s execution context. The intptr_t
argument, <code class="computeroutput"><span class="identifier">p</span></code>, is passed
to the current context to be returned by the most recent call to <code class="computeroutput"><span class="identifier">jump_fcontext</span><span class="special">()</span></code>
in the same thread. The last argument controls if fpu registers have
to be preserved.
</p></dd>
<dt><span class="term">Returns:</span></dt>
<dd><p>
The third pointer argument passed to the most recent call to <code class="computeroutput"><span class="identifier">jump_fcontext</span><span class="special">()</span></code>,
if any.
</p></dd>
</dl>
</div>
<h5>
<a name="context.context.boost_fcontext.h4"></a>
<span><a name="context.context.boost_fcontext._code__phrase_role__keyword__void__phrase___phrase_role__identifier__make_fcontext__phrase__phrase_role__special_____phrase___phrase_role__identifier__fcontext_t__phrase___phrase_role__special_____phrase___phrase_role__identifier__fc__phrase__phrase_role__special_____phrase___phrase_role__keyword__void__phrase__phrase_role__special______phrase__phrase_role__identifier__fn__phrase__phrase_role__special______phrase__phrase_role__identifier__intptr_t__phrase__phrase_role__special______phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__keyword__void__phrase___phrase_role__identifier__make_fcontext__phrase__phrase_role__special_____phrase___phrase_role__identifier__fcontext_t__phrase___phrase_role__special_____phrase___phrase_role__identifier__fc__phrase__phrase_role__special_____phrase___phrase_role__keyword__void__phrase__phrase_role__special______phrase__phrase_role__identifier__fn__phrase__phrase_role__special______phrase__phrase_role__identifier__intptr_t__phrase__phrase_role__special______phrase___code_"><code class="computeroutput"><span class="keyword">void</span> <span class="identifier">make_fcontext</span><span class="special">(</span> <span class="identifier">fcontext_t</span>
<span class="special">*</span> <span class="identifier">fc</span><span class="special">,</span> <span class="keyword">void</span><span class="special">(*</span><span class="identifier">fn</span><span class="special">)(</span><span class="identifier">intptr_t</span><span class="special">))</span></code></a>
</h5>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">Precondition:</span></dt>
<dd><p>
A stack is applied to <code class="computeroutput"><span class="special">*</span><span class="identifier">fc</span></code> before <code class="computeroutput"><span class="identifier">make_fcontext</span><span class="special">()</span></code> is called.
</p></dd>
<dt><span class="term">Effects:</span></dt>
<dd><p>
Modifies <code class="computeroutput"><span class="special">*</span><span class="identifier">fc</span></code>
in order to execute <code class="computeroutput"><span class="identifier">fn</span></code>
when the context is activated next.
</p></dd>
</dl>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2009 Oliver Kowalke<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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