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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>
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