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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="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">&lt;</span><span class="identifier">opaque</span> <span class="identifier">pointer</span> <span class="special">&gt;</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>
              &gt; 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 &#169; 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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Commit	Line	Data
7c673cae FG	1	<html>
	2	<head>
	3	<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
	4	<title>fcontext_t and related functions</title>
	5	<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
	6	<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
	7	<link rel="home" href="../../index.html" title="Chapter 1. Context">
	8	<link rel="up" href="../context.html" title="Struct fcontext_t">
	9	<link rel="prev" href="../context.html" title="Struct fcontext_t">
	10	<link rel="next" href="../econtext.html" title="Class execution_context">
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	13	<table cellpadding="2" width="100%"><tr>
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	21	<hr>
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	24	</div>
	25	<div class="section">
	26	<div class="titlepage"><div><div><h3 class="title">
	27	<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>
	28	and related functions</a>
	29	</h3></div></div></div>
	30	<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">stack_t</span>
	31	<span class="special">{</span>
	32	<span class="keyword">void</span><span class="special">*</span> <span class="identifier">sp</span><span class="special">;</span>
	33	<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size</span><span class="special">;</span>
	34	<span class="special">};</span>
	35
	36	<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>
	37
	38	<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>
	39	<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>
	40	</pre>
	41	<h5>
	42	<a name="context.context.boost_fcontext.h0"></a>
	43	<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>
	44	</h5>
	45	<div class="variablelist">
	46	<p class="title"><b></b></p>
	47	<dl>
	48	<dt><span class="term">Member:</span></dt>
	49	<dd><p>
	50	Pointer to the beginning of the stack (depending of the architecture
	51	the stack grows downwards or upwards).
	52	</p></dd>
	53	</dl>
	54	</div>
	55	<h5>
	56	<a name="context.context.boost_fcontext.h1"></a>
	57	<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>
	58	</h5>
	59	<div class="variablelist">
	60	<p class="title"><b></b></p>
	61	<dl>
	62	<dt><span class="term">Member:</span></dt>
	63	<dd><p>
	64	Size of the stack in bytes.
65	</p></dd>
66	</dl>
67	</div>
68	<h5>
69	<a name="context.context.boost_fcontext.h2"></a>
70	<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>
71	</h5>
72	<div class="variablelist">
73	<p class="title"><b></b></p>
74	<dl>
75	<dt><span class="term">Member:</span></dt>
76	<dd><p>
77	Tracks the memory for the context's stack.
78	</p></dd>
79	</dl>
80	</div>
81	<h5>
82	<a name="context.context.boost_fcontext.h3"></a>
83	<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>
84	<span class="identifier">preserve_fpu</span><span class="special">=</span><span class="keyword">true</span><span class="special">)</span></code></a>
85	</h5>
86	<div class="variablelist">
87	<p class="title"><b></b></p>
88	<dl>
89	<dt><span class="term">Effects:</span></dt>
90	<dd><p>
91	Stores the current context data (stack pointer, instruction pointer,
92	and CPU registers) to <code class="computeroutput"><span class="special">*</span><span class="identifier">ofc</span></code> and restores the context data
93	from <code class="computeroutput"><span class="identifier">nfc</span></code>, which implies
94	jumping to <code class="computeroutput"><span class="identifier">nfc</span></code>'s execution
95	context. The intptr_t argument, <code class="computeroutput"><span class="identifier">p</span></code>,
96	is passed to the current context to be returned by the most recent
97	call to <code class="computeroutput"><span class="identifier">jump_fcontext</span><span class="special">()</span></code> in the same thread. The last argument
98	controls if fpu registers have to be preserved.
99	</p></dd>
100	<dt><span class="term">Returns:</span></dt>
101	<dd><p>
102	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>,
103	if any.
104	</p></dd>
105	</dl>
106	</div>
107	<h5>
108	<a name="context.context.boost_fcontext.h4"></a>
109	<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>
110	<span class="identifier">sp</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>
111	<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>
112	</h5>
113	<div class="variablelist">
114	<p class="title"><b></b></p>
115	<dl>
116	<dt><span class="term">Precondition:</span></dt>
117	<dd><p>
118	Stack <code class="computeroutput"><span class="identifier">sp</span></code> and function
119	pointer <code class="computeroutput"><span class="identifier">fn</span></code> are valid
120	(depending on the architecture <code class="computeroutput"><span class="identifier">sp</span></code>
121	points to the top or bottom of the stack) and <code class="computeroutput"><span class="identifier">size</span></code>
122	> 0.
123	</p></dd>
124	<dt><span class="term">Effects:</span></dt>
125	<dd><p>
126	Creates an fcontext_t on top of the stack and prepares the stack to
127	execute the <span class="emphasis"><em>context-function</em></span> <code class="computeroutput"><span class="identifier">fn</span></code>.
128	</p></dd>
129	<dt><span class="term">Returns:</span></dt>
130	<dd><p>
131	Returns a fcontext_t which is placed on the stack.
132	</p></dd>
133	</dl>
134	</div>
135	</div>
136	<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
137	<td align="left"></td>
138	<td align="right"><div class="copyright-footer">Copyright © 2014 Oliver Kowalke<p>
139	Distributed under the Boost Software License, Version 1.0. (See accompanying
140	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>)
141	</p>
142	</div></td>
143	</tr></table>
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