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doxygen="_cgi:http://www.nevrax.org/cgi-bin/nel-search.cgi" href="http://www.nevrax.org/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> + +<!-- footer --> +<BR><FONT Size=+5> </FONT> +</TD> +<TD WIDTH=15><IMG SRC=http://www.nevrax.org/inc/img/pixel.gif WIDTH=15 HEIGHT=15 BORDER=0 ALT=""></TD> +</TR> +</TABLE> +</BODY> +</HTML> |