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<a class="qindex" href="index.html">Main Page</a> <a class="qindex" href="namespaces.html">Namespace List</a> <a class="qindex" href="hierarchy.html">Class Hierarchy</a> <a class="qindex" href="classes.html">Alphabetical List</a> <a class="qindex" href="annotated.html">Compound List</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="namespacemembers.html">Namespace Members</a> <a class="qindex" href="functions.html">Compound Members</a> <a class="qindex" href="globals.html">File Members</a> <a class="qindex" href="pages.html">Related Pages</a> <a class="qindexRef" doxygen="_cgi:/cgi-bin/nel-search.cgi" href="/cgi-bin/nel-search.cgi">Search</a> </center>
<hr><h1>reader_writer.h</h1><a href="reader__writer_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00006 <font class="comment">/* Copyright, 2001 Nevrax Ltd.</font>
00007 <font class="comment"> *</font>
00008 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00009 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00010 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00011 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00012 <font class="comment"> * any later version.</font>
00013 <font class="comment"></font>
00014 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00015 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00016 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00017 <font class="comment"> * General Public License for more details.</font>
00018 <font class="comment"></font>
00019 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00020 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00021 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00022 <font class="comment"> * MA 02111-1307, USA.</font>
00023 <font class="comment"> */</font>
00024
00025 <font class="preprocessor">#ifndef NL_READER_WRITER_H</font>
00026 <font class="preprocessor"></font><font class="preprocessor">#define NL_READER_WRITER_H</font>
00027 <font class="preprocessor"></font>
00028 <font class="preprocessor">#include "<a class="code" href="types__nl_8h.html">nel/misc/types_nl.h</a>"</font>
00029 <font class="preprocessor">#include "<a class="code" href="mutex_8h.html">nel/misc/mutex.h</a>"</font>
00030
00031
00032 <font class="keyword">namespace </font>NLMISC {
00033
<a name="l00040"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html">00040</a> <font class="keyword">class </font>CReaderWriter
00041 {
00042 <font class="keyword">private</font>:
00043
<a name="l00044"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#o0">00044</a> <font class="keyword">volatile</font> <a class="code" href="mutex_8h.html#a1">CMutex</a> <a class="code" href="classNLMISC_1_1CReaderWriter.html#o0">_Fairness</a>;
<a name="l00045"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#o1">00045</a> <font class="keyword">volatile</font> <a class="code" href="mutex_8h.html#a1">CMutex</a> <a class="code" href="classNLMISC_1_1CReaderWriter.html#o1">_ReadersMutex</a>;
<a name="l00046"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#o2">00046</a> <font class="keyword">volatile</font> <a class="code" href="mutex_8h.html#a1">CMutex</a> <a class="code" href="classNLMISC_1_1CReaderWriter.html#o2">_RWMutex</a>;
<a name="l00047"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#o3">00047</a> <font class="keyword">volatile</font> sint <a class="code" href="classNLMISC_1_1CReaderWriter.html#o3">_ReadersLevel</a>;
00048
00049 <font class="keyword">public</font>:
00050
00051 <a class="code" href="classNLMISC_1_1CReaderWriter.html#a0">CReaderWriter</a>();
00052 <a class="code" href="classNLMISC_1_1CReaderWriter.html#a1">~CReaderWriter</a>();
00053
<a name="l00054"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#a2">00054</a> <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CReaderWriter.html#a2">enterReader</a>()
00055 {
00056 const_cast<CMutex&>(_Fairness).enter();
00057 const_cast<CMutex&>(_ReadersMutex).enter();
00058 ++<a class="code" href="classNLMISC_1_1CReaderWriter.html#o3">_ReadersLevel</a>;
00059 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CReaderWriter.html#o3">_ReadersLevel</a> == 1)
00060 const_cast<CMutex&>(_RWMutex).enter();
00061 const_cast<CMutex&>(_ReadersMutex).leave();
00062 const_cast<CMutex&>(_Fairness).leave();
00063 }
00064
<a name="l00065"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#a3">00065</a> <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CReaderWriter.html#a3">leaveReader</a>()
00066 {
00067 const_cast<CMutex&>(_ReadersMutex).enter();
00068 --<a class="code" href="classNLMISC_1_1CReaderWriter.html#o3">_ReadersLevel</a>;
00069 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CReaderWriter.html#o3">_ReadersLevel</a> == 0)
00070 const_cast<CMutex&>(_RWMutex).leave();
00071 const_cast<CMutex&>(_ReadersMutex).leave();
00072 }
00073
<a name="l00074"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#a4">00074</a> <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CReaderWriter.html#a4">enterWriter</a>()
00075 {
00076 const_cast<CMutex&>(_Fairness).enter();
00077 const_cast<CMutex&>(_RWMutex).enter();
00078 const_cast<CMutex&>(_Fairness).leave();
00079 }
00080
<a name="l00081"></a><a class="code" href="classNLMISC_1_1CReaderWriter.html#a5">00081</a> <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CReaderWriter.html#a5">leaveWriter</a>()
00082 {
00083 const_cast<CMutex&>(_RWMutex).leave();
00084 }
00085 };
00086
00093 <font class="keyword">template</font> <<font class="keyword">class</font> T>
<a name="l00094"></a><a class="code" href="classNLMISC_1_1CRWSynchronized.html">00094</a> <font class="keyword">class </font>CRWSynchronized
00095 {
00096 <font class="keyword">public</font>:
00097
<a name="l00098"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html">00098</a> <font class="keyword">class </font>CReadAccessor
00099 {
<a name="l00100"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#o0">00100</a> CRWSynchronized<T> *<a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#o0">_RWSynchronized</a>;
00101
00102 <font class="keyword">public</font>:
00103
<a name="l00104"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a0">00104</a> <a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a0">CReadAccessor</a>(CRWSynchronized<T> *cs)
00105 {
00106 _RWSynchronized = cs;
00107 const_cast<CReaderWriter&>(_RWSynchronized->_RWSync).enterReader();
00108 }
00109
<a name="l00110"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a1">00110</a> <a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a1">~CReadAccessor</a>()
00111 {
00112 const_cast<CReaderWriter&>(_RWSynchronized->_RWSync).leaveReader();
00113 }
00114
<a name="l00115"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a2">00115</a> <font class="keyword">const</font> T &<a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a2">value</a>()
00116 {
00117 <font class="keywordflow">return</font> const_cast<const T&>(_RWSynchronized->_Value);
00118 }
00119 };
00120
<a name="l00121"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html">00121</a> <font class="keyword">class </font>CWriteAccessor
00122 {
<a name="l00123"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#o0">00123</a> CRWSynchronized<T> *<a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#o0">_RWSynchronized</a>;
00124
00125 <font class="keyword">public</font>:
00126
<a name="l00127"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a0">00127</a> <a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a0">CWriteAccessor</a>(CRWSynchronized<T> *cs)
00128 {
00129 _RWSynchronized = cs;
00130 const_cast<CReaderWriter&>(_RWSynchronized->_RWSync).enterWriter();
00131 }
00132
<a name="l00133"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a1">00133</a> <a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a1">~CWriteAccessor</a>()
00134 {
00135 const_cast<CReaderWriter&>(_RWSynchronized->_RWSync).leaveWriter();
00136 }
00137
<a name="l00138"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a2">00138</a> T &<a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a2">value</a>()
00139 {
00140 <font class="keywordflow">return</font> const_cast<T&>(_RWSynchronized->_Value);
00141 }
00142 };
00143
00144 <font class="keyword">private</font>:
<a name="l00145"></a><a class="code" href="classNLMISC_1_1CRWSynchronized.html#l0">00145</a> <font class="keyword">friend</font> <font class="keyword">class </font>CRWSynchronized::CReadAccessor;
<a name="l00146"></a><a class="code" href="classNLMISC_1_1CRWSynchronized.html#l1">00146</a> friend class CRWSynchronized::CWriteAccessor;
00147
<a name="l00148"></a><a class="code" href="classNLMISC_1_1CRWSynchronized.html#o0">00148</a> volatile CReaderWriter <a class="code" href="classNLMISC_1_1CRWSynchronized.html#o0">_RWSync</a>;
00149
<a name="l00150"></a><a class="code" href="classNLMISC_1_1CRWSynchronized.html#o1">00150</a> volatile T <a class="code" href="classNLMISC_1_1CRWSynchronized.html#o1">_Value</a>;
00151
00152 };
00153
00154 } <font class="comment">// NLMISC</font>
00155
00156
00157 #endif <font class="comment">// NL_READER_WRITER_H</font>
00158
00159 <font class="comment">/* End of reader_writer.h */</font>
</pre></div>
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