1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Rationale</title> 5<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../index.html" title="Chapter 1. Context"> 8<link rel="up" href="../index.html" title="Chapter 1. Context"> 9<link rel="prev" href="architectures/crosscompiling.html" title="Cross compiling"> 10<link rel="next" href="rationale/other_apis_.html" title="Other APIs"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="architectures/crosscompiling.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="rationale/other_apis_.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 27<a name="context.rationale"></a><a class="link" href="rationale.html" title="Rationale">Rationale</a> 28</h2></div></div></div> 29<div class="toc"><dl class="toc"> 30<dt><span class="section"><a href="rationale/other_apis_.html">Other APIs </a></span></dt> 31<dt><span class="section"><a href="rationale/x86_and_floating_point_env.html">x86 and 32 floating-point env</a></span></dt> 33</dl></div> 34<h4> 35<a name="context.rationale.h0"></a> 36 <span class="phrase"><a name="context.rationale.no_inline_assembler"></a></span><a class="link" href="rationale.html#context.rationale.no_inline_assembler">No 37 inline-assembler</a> 38 </h4> 39<p> 40 Some newer compiler (for instance MSVC 10 for x86_64 and itanium) do not support 41 inline assembler. <a href="#ftn.context.rationale.f0" class="footnote" name="context.rationale.f0"><sup class="footnote">[1]</sup></a>. Inlined assembler generates code bloating which is not welcome 42 on embedded systems. 43 </p> 44<h4> 45<a name="context.rationale.h1"></a> 46 <span class="phrase"><a name="context.rationale.fcontext_t"></a></span><a class="link" href="rationale.html#context.rationale.fcontext_t">fcontext_t</a> 47 </h4> 48<p> 49 <span class="bold"><strong>Boost.Context</strong></span> provides the low level API fcontext_t 50 which is implemented in assembler to provide context swapping operations. fcontext_t 51 is the part to port to new platforms. 52 </p> 53<div class="note"><table border="0" summary="Note"> 54<tr> 55<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../doc/src/images/note.png"></td> 56<th align="left">Note</th> 57</tr> 58<tr><td align="left" valign="top"><p> 59 Context switches do not preserve the signal mask on UNIX systems. 60 </p></td></tr> 61</table></div> 62<p> 63 <span class="emphasis"><em>fcontext_t</em></span> is an opaque pointer. 64 </p> 65<div class="footnotes"> 66<br><hr style="width:100; text-align:left;margin-left: 0"> 67<div id="ftn.context.rationale.f0" class="footnote"><p><a href="#context.rationale.f0" class="para"><sup class="para">[1] </sup></a> 68 <a href="http://msdn.microsoft.com/en-us/library/4ks26t93.aspx" target="_top">MSDN article 69 'Inline Assembler'</a> 70 </p></div> 71</div> 72</div> 73<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 74<td align="left"></td> 75<td align="right"><div class="copyright-footer">Copyright © 2014 Oliver Kowalke<p> 76 Distributed under the Boost Software License, Version 1.0. (See accompanying 77 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>) 78 </p> 79</div></td> 80</tr></table> 81<hr> 82<div class="spirit-nav"> 83<a accesskey="p" href="architectures/crosscompiling.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="rationale/other_apis_.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 84</div> 85</body> 86</html> 87
