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+<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&lt;CMutex&amp;&gt;(_Fairness).enter();
+00057 const_cast&lt;CMutex&amp;&gt;(_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&lt;CMutex&amp;&gt;(_RWMutex).enter();
+00061 const_cast&lt;CMutex&amp;&gt;(_ReadersMutex).leave();
+00062 const_cast&lt;CMutex&amp;&gt;(_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&lt;CMutex&amp;&gt;(_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&lt;CMutex&amp;&gt;(_RWMutex).leave();
+00071 const_cast&lt;CMutex&amp;&gt;(_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&lt;CMutex&amp;&gt;(_Fairness).enter();
+00077 const_cast&lt;CMutex&amp;&gt;(_RWMutex).enter();
+00078 const_cast&lt;CMutex&amp;&gt;(_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&lt;CMutex&amp;&gt;(_RWMutex).leave();
+00084 }
+00085 };
+00086
+00093 <font class="keyword">template</font> &lt;<font class="keyword">class</font> T&gt;
+<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&lt;T&gt; *<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&lt;T&gt; *cs)
+00105 {
+00106 _RWSynchronized = cs;
+00107 const_cast&lt;CReaderWriter&amp;&gt;(_RWSynchronized-&gt;_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&lt;CReaderWriter&amp;&gt;(_RWSynchronized-&gt;_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 &amp;<a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CReadAccessor.html#a2">value</a>()
+00116 {
+00117 <font class="keywordflow">return</font> const_cast&lt;const T&amp;&gt;(_RWSynchronized-&gt;_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&lt;T&gt; *<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&lt;T&gt; *cs)
+00128 {
+00129 _RWSynchronized = cs;
+00130 const_cast&lt;CReaderWriter&amp;&gt;(_RWSynchronized-&gt;_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&lt;CReaderWriter&amp;&gt;(_RWSynchronized-&gt;_RWSync).leaveWriter();
+00136 }
+00137
+<a name="l00138"></a><a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a2">00138</a> T &amp;<a class="code" href="classNLMISC_1_1CRWSynchronized_1_1CWriteAccessor.html#a2">value</a>()
+00139 {
+00140 <font class="keywordflow">return</font> const_cast&lt;T&amp;&gt;(_RWSynchronized-&gt;_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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