1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Type level</title> 6<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../../mpi/reference.html#header.boost.mpi.environment_hpp" title="Header <boost/mpi/environment.hpp>"> 10<link rel="prev" href="../packed.html" title="Struct packed"> 11<link rel="next" href="operat_1_3_27_7_10_2_1_2_2.html" title="Function operator<<"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" 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27<a name="boost.mpi.threading.level"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Type level</span></h2> 30<p>boost::mpi::threading::level — specify the supported threading level. </p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../../mpi/reference.html#header.boost.mpi.environment_hpp" title="Header <boost/mpi/environment.hpp>">boost/mpi/environment.hpp</a>> 34 35</span> 36<span class="keyword">enum</span> <span class="identifier">level</span> <span class="special">{</span> <a class="link" href="level.html#boost.mpi.threading.level.single">single</a> = = MPI_THREAD_SINGLE, <a class="link" href="level.html#boost.mpi.threading.level.funneled">funneled</a> = = MPI_THREAD_FUNNELED, 37 <a class="link" href="level.html#boost.mpi.threading.level.serialized">serialized</a> = = MPI_THREAD_SERIALIZED, 38 <a class="link" href="level.html#boost.mpi.threading.level.multiple">multiple</a> = = MPI_THREAD_MULTIPLE <span class="special">}</span><span class="special">;</span></pre></div> 39<div class="refsect1"> 40<a name="id-1.3.27.7.11.4.4"></a><h2>Description</h2> 41<p>Based on MPI 2 standard/8.7.3 </p> 42<div class="variablelist"><dl class="variablelist compact"> 43<dt><span class="term"><code class="computeroutput">single</code><a name="boost.mpi.threading.level.single"></a></span></dt> 44<dd><p>Only one thread will execute. </p></dd> 45<dt><span class="term"><code class="computeroutput">funneled</code><a name="boost.mpi.threading.level.funneled"></a></span></dt> 46<dd> 47<p>Only main thread will do MPI calls.</p> 48<p>The process may be multi-threaded, but only the main thread will make MPI calls (all MPI calls are `<span style="color: red"><lsquo></lsquo></span>funneled<span style="color: red"><rsquo></rsquo></span>' to the main thread). </p> 49</dd> 50<dt><span class="term"><code class="computeroutput">serialized</code><a name="boost.mpi.threading.level.serialized"></a></span></dt> 51<dd> 52<p>Only one thread at the time do MPI calls.</p> 53<p>The process may be multi-threaded, and multiple threads may make MPI calls, but only one at a time: MPI calls are not made concurrently from two distinct threads (all MPI calls are `<span style="color: red"><lsquo></lsquo></span>serialized<span style="color: red"><rsquo></rsquo></span>'). </p> 54</dd> 55<dt><span class="term"><code class="computeroutput">multiple</code><a name="boost.mpi.threading.level.multiple"></a></span></dt> 56<dd> 57<p>Multiple thread may do MPI calls.</p> 58<p>Multiple threads may call MPI, with no restrictions. </p> 59</dd> 60</dl></div> 61</div> 62</div> 63<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 64<td align="left"></td> 65<td align="right"><div class="copyright-footer">Copyright © 2005-2007 Douglas Gregor, 66 Matthias Troyer, Trustees of Indiana University<p> 67 Distributed under the Boost Software License, Version 1.0. (See accompanying 68 file LICENSE_1_0.txt or copy at <ulink url="http://www.boost.org/LICENSE_1_0.txt"> 69 http://www.boost.org/LICENSE_1_0.txt </ulink>) 70 </p> 71</div></td> 72</tr></table> 73<hr> 74<div class="spirit-nav"> 75<a accesskey="p" href="../packed.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../mpi/reference.html#header.boost.mpi.environment_hpp"><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="operat_1_3_27_7_10_2_1_2_2.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 76</div> 77</body> 78</html> 79
