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| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="context.context.boost_fcontext"></a><a class="link" href="boost_fcontext.html" title="fcontext_t and related functions"><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">sp</span><span class="special">;</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">;</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">typedef</span> <span class="special"><</span><span class="identifier">opaque</span> <span class="identifier">pointer</span> <span class="special">></span> <span class="identifier">fcontext_t</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="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">bool</span> <span class="identifier">preserve_fpu</span><span class="special">=</span><span class="keyword">true</span><span class="special">);</span> |
| <span class="identifier">fcontext_t</span> <span class="identifier">make_fcontext</span><span class="special">(</span><span class="keyword">void</span><span class="special">*</span> <span class="identifier">sp</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size</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> |
| </pre> |
| <h5> |
| <a name="context.context.boost_fcontext.h0"></a> |
| <span><a name="context.context.boost_fcontext._code__phrase_role__identifier__sp__phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__identifier__sp__phrase___code_"><code class="computeroutput"><span class="identifier">sp</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 beginning of the stack (depending of the architecture |
| the stack grows downwards or upwards). |
| </p></dd> |
| </dl> |
| </div> |
| <h5> |
| <a name="context.context.boost_fcontext.h1"></a> |
| <span><a name="context.context.boost_fcontext._code__phrase_role__identifier__size__phrase___code_"></a></span><a class="link" href="boost_fcontext.html#context.context.boost_fcontext._code__phrase_role__identifier__size__phrase___code_"><code class="computeroutput"><span class="identifier">size</span></code></a> |
| </h5> |
| <div class="variablelist"> |
| <p class="title"><b></b></p> |
| <dl> |
| <dt><span class="term">Member:</span></dt> |
| <dd><p> |
| Size of the stack in bytes. |
| </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__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__phrase_role__keyword__true__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__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__phrase_role__keyword__true__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="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><span class="keyword">true</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="identifier">nfc</span></code>, which implies |
| jumping to <code class="computeroutput"><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__identifier__fcontext_t__phrase___phrase_role__identifier__make_fcontext__phrase__phrase_role__special_____phrase__phrase_role__keyword__void__phrase__phrase_role__special_____phrase___phrase_role__identifier__sp__phrase__phrase_role__special_____phrase__phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__size__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__identifier__fcontext_t__phrase___phrase_role__identifier__make_fcontext__phrase__phrase_role__special_____phrase__phrase_role__keyword__void__phrase__phrase_role__special_____phrase___phrase_role__identifier__sp__phrase__phrase_role__special_____phrase__phrase_role__identifier__std__phrase__phrase_role__special______phrase__phrase_role__identifier__size_t__phrase___phrase_role__identifier__size__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="identifier">fcontext_t</span> <span class="identifier">make_fcontext</span><span class="special">(</span><span class="keyword">void</span><span class="special">*</span> |
| <span class="identifier">sp</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> |
| <span class="identifier">size</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> |
| Stack <code class="computeroutput"><span class="identifier">sp</span></code> and function |
| pointer <code class="computeroutput"><span class="identifier">fn</span></code> are valid |
| (depending on the architecture <code class="computeroutput"><span class="identifier">sp</span></code> |
| points to the top or bottom of the stack) and <code class="computeroutput"><span class="identifier">size</span></code> |
| > 0. |
| </p></dd> |
| <dt><span class="term">Effects:</span></dt> |
| <dd><p> |
| Creates an fcontext_t on top of the stack and prepares the stack to |
| execute the <span class="emphasis"><em>context-function</em></span> <code class="computeroutput"><span class="identifier">fn</span></code>. |
| </p></dd> |
| <dt><span class="term">Returns:</span></dt> |
| <dd><p> |
| Returns a fcontext_t which is placed on the stack. |
| </p></dd> |
| </dl> |
| </div> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2014 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> |
| </div></td> |
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