<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>RAUL: Semaphore.hpp Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.7.1 --> <div class="navigation" id="top"> <div class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="annotated.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul> </div> <div class="tabs2"> <ul class="tablist"> <li><a href="files.html"><span>File List</span></a></li> </ul> </div> <div class="header"> <div class="headertitle"> <h1>Semaphore.hpp</h1> </div> </div> <div class="contents"> <div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* This file is part of Raul.</span> <a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2007-2009 David Robillard <http://drobilla.net></span> <a name="l00003"></a>00003 <span class="comment"> *</span> <a name="l00004"></a>00004 <span class="comment"> * Raul is free software; you can redistribute it and/or modify it under the</span> <a name="l00005"></a>00005 <span class="comment"> * terms of the GNU General Public License as published by the Free Software</span> <a name="l00006"></a>00006 <span class="comment"> * Foundation; either version 2 of the License, or (at your option) any later</span> <a name="l00007"></a>00007 <span class="comment"> * version.</span> <a name="l00008"></a>00008 <span class="comment"> *</span> <a name="l00009"></a>00009 <span class="comment"> * Raul is distributed in the hope that it will be useful, but WITHOUT ANY</span> <a name="l00010"></a>00010 <span class="comment"> * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span> <a name="l00011"></a>00011 <span class="comment"> * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.</span> <a name="l00012"></a>00012 <span class="comment"> *</span> <a name="l00013"></a>00013 <span class="comment"> * You should have received a copy of the GNU General Public License along</span> <a name="l00014"></a>00014 <span class="comment"> * with this program; if not, write to the Free Software Foundation, Inc.,</span> <a name="l00015"></a>00015 <span class="comment"> * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA</span> <a name="l00016"></a>00016 <span class="comment"> */</span> <a name="l00017"></a>00017 <a name="l00018"></a>00018 <span class="preprocessor">#ifndef RAUL_SEMAPHORE_HPP</span> <a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor">#define RAUL_SEMAPHORE_HPP</span> <a name="l00020"></a>00020 <span class="preprocessor"></span> <a name="l00021"></a>00021 <span class="preprocessor">#include <semaphore.h></span> <a name="l00022"></a>00022 <span class="preprocessor">#include <boost/utility.hpp></span> <a name="l00023"></a>00023 <a name="l00024"></a>00024 <span class="keyword">namespace </span>Raul { <a name="l00025"></a>00025 <a name="l00026"></a>00026 <a name="l00031"></a><a class="code" href="classRaul_1_1Semaphore.html">00031</a> <span class="keyword">class </span><a class="code" href="classRaul_1_1Semaphore.html" title="Trivial wrapper around POSIX semaphores (zero memory overhead).">Semaphore</a> : boost::noncopyable { <a name="l00032"></a>00032 <span class="keyword">public</span>: <a name="l00033"></a>00033 <span class="keyword">inline</span> <a class="code" href="classRaul_1_1Semaphore.html" title="Trivial wrapper around POSIX semaphores (zero memory overhead).">Semaphore</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> initial) { sem_init(&_sem, 0, initial); } <a name="l00034"></a>00034 <a name="l00035"></a>00035 <span class="keyword">inline</span> ~<a class="code" href="classRaul_1_1Semaphore.html" title="Trivial wrapper around POSIX semaphores (zero memory overhead).">Semaphore</a>() { sem_destroy(&_sem); } <a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="keyword">inline</span> <span class="keywordtype">void</span> reset(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> initial) { <a name="l00038"></a>00038 sem_destroy(&_sem); <a name="l00039"></a>00039 sem_init(&_sem, 0, initial); <a name="l00040"></a>00040 } <a name="l00041"></a>00041 <a name="l00042"></a>00042 <span class="keyword">inline</span> <span class="keywordtype">bool</span> has_waiter() { <a name="l00043"></a>00043 <span class="keywordtype">int</span> val; <a name="l00044"></a>00044 sem_getvalue(&_sem, &val); <a name="l00045"></a>00045 <span class="keywordflow">return</span> (val <= 0); <a name="l00046"></a>00046 } <a name="l00047"></a>00047 <a name="l00052"></a><a class="code" href="classRaul_1_1Semaphore.html#a5ae17e57432268156acaa23561eafe27">00052</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classRaul_1_1Semaphore.html#a5ae17e57432268156acaa23561eafe27" title="Increment (and signal any waiters).">post</a>() { sem_post(&_sem); } <a name="l00053"></a>00053 <a name="l00061"></a><a class="code" href="classRaul_1_1Semaphore.html#a0d17dc95c051e542791c226b648ce8bf">00061</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classRaul_1_1Semaphore.html#a0d17dc95c051e542791c226b648ce8bf" title="Wait until count is &gt; 0, then decrement.">wait</a>() { <span class="keywordflow">while</span> (sem_wait(&_sem) != 0) {} } <a name="l00062"></a>00062 <a name="l00069"></a><a class="code" href="classRaul_1_1Semaphore.html#adfb3336d3c186fe10dbefb07c12af2fd">00069</a> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="classRaul_1_1Semaphore.html#adfb3336d3c186fe10dbefb07c12af2fd" title="Non-blocking version of wait().">try_wait</a>() { <span class="keywordflow">return</span> (sem_trywait(&_sem) == 0); } <a name="l00070"></a>00070 <a name="l00071"></a>00071 <span class="keyword">private</span>: <a name="l00072"></a>00072 sem_t _sem; <a name="l00073"></a>00073 }; <a name="l00074"></a>00074 <a name="l00075"></a>00075 <a name="l00076"></a>00076 } <span class="comment">// namespace Raul</span> <a name="l00077"></a>00077 <a name="l00078"></a>00078 <span class="preprocessor">#endif // RAUL_SEMAPHORE_HPP</span> </pre></div></div> </div> <hr class="footer"/><address class="footer"><small>Generated on Wed Oct 6 2010 for RAUL by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.1 </small></address> </body> </html>