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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
committerneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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+<hr><h1>shared_memory.cpp</h1><a href="shared__memory_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
+00007 <font class="comment">/* Copyright, 2000-2002 Nevrax Ltd.</font>
+00008 <font class="comment"> *</font>
+00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
+00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
+00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
+00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
+00013 <font class="comment"> * any later version.</font>
+00014 <font class="comment"></font>
+00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
+00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
+00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
+00018 <font class="comment"> * General Public License for more details.</font>
+00019 <font class="comment"></font>
+00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
+00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
+00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
+00023 <font class="comment"> * MA 02111-1307, USA.</font>
+00024 <font class="comment"> */</font>
+00025
+00026 <font class="preprocessor">#include "<a class="code" href="stdmisc_8h.html">stdmisc.h</a>"</font>
+00027 <font class="preprocessor">#include "<a class="code" href="shared__memory_8h.html">nel/misc/shared_memory.h</a>"</font>
+00028
+00029 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00030 <font class="preprocessor"></font><font class="preprocessor">#include &lt;windows.h&gt;</font>
+00031 <font class="preprocessor">#else</font>
+00032 <font class="preprocessor"></font><font class="preprocessor"># include &lt;sys/types.h&gt;</font>
+00033 <font class="preprocessor"># include &lt;sys/ipc.h&gt;</font>
+00034 <font class="preprocessor"># include &lt;sys/shm.h&gt;</font>
+00035 <font class="preprocessor">#endif</font>
+00036 <font class="preprocessor"></font>
+00037 <font class="keyword">using</font> <font class="keyword">namespace </font>std;
+00038
+00039
+00040 <font class="keyword">namespace </font>NLMISC {
+00041
+00042
+00043 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00044 <font class="preprocessor"></font> <font class="comment">// Storage for file handles, necessary to close the handles</font>
+00045 map&lt;void*,HANDLE&gt; AccessAddressesToHandles;
+00046 <font class="preprocessor">#else</font>
+00047 <font class="preprocessor"></font> <font class="comment">// Storage for shmid, necessary to destroy the segments</font>
+00048 map&lt;TSharedMemId, int&gt; <a class="code" href="namespaceNLMISC.html#a202">SharedMemIdsToShmids</a>;
+00049 <font class="preprocessor">#endif</font>
+00050 <font class="preprocessor"></font>
+00051
+00052 <font class="comment">/*</font>
+00053 <font class="comment"> * Create a shared memory segment</font>
+00054 <font class="comment"> */</font>
+<a name="l00055"></a><a class="code" href="classNLMISC_1_1CSharedMemory.html#d0">00055</a> <font class="keywordtype">void</font> *CSharedMemory::createSharedMemory( <a class="code" href="namespaceNLMISC.html#a176">TSharedMemId</a> sharedMemId, uint32 size )
+00056 {
+00057 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00058 <font class="preprocessor"></font>
+00059 <font class="comment">// Create a file mapping backed by the virtual memory swap file (not a data file)</font>
+00060 HANDLE hMapFile = CreateFileMapping( INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, size, sharedMemId );
+00061 <font class="keywordflow">if</font> ( (hMapFile == NULL) || (GetLastError() == ERROR_ALREADY_EXISTS) )
+00062 <font class="keywordflow">return</font> NULL;
+00063
+00064 <font class="comment">// Map the file into memory address space</font>
+00065 <font class="keywordtype">void</font> *accessAddress = MapViewOfFile( hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
+00066 AccessAddressesToHandles.insert( make_pair( accessAddress, hMapFile ) );
+00067 <font class="keywordflow">return</font> accessAddress;
+00068
+00069 <font class="preprocessor">#else</font>
+00070 <font class="preprocessor"></font>
+00071 <font class="comment">// Create a shared memory segment</font>
+00072 <font class="keywordtype">int</font> shmid = shmget( sharedMemId, size, IPC_CREAT | IPC_EXCL | 0666 );
+00073 <font class="keywordflow">if</font> ( shmid == -1 )
+00074 <font class="keywordflow">return</font> NULL;
+00075 <a class="code" href="namespaceNLMISC.html#a202">SharedMemIdsToShmids</a>.insert( make_pair( sharedMemId, shmid ) );
+00076
+00077 <font class="comment">// Map the segment into memory address space</font>
+00078 <font class="keywordtype">void</font> *accessAddress = (<font class="keywordtype">void</font>*)shmat( shmid, 0, 0 );
+00079 <font class="keywordflow">if</font> ( accessAddress == (<font class="keywordtype">void</font>*)-1 )
+00080 <font class="keywordflow">return</font> NULL;
+00081 <font class="keywordflow">else</font>
+00082 <font class="keywordflow">return</font> accessAddress;
+00083 <font class="preprocessor">#endif</font>
+00084 <font class="preprocessor"></font>}
+00085
+00086
+00087 <font class="comment">/*</font>
+00088 <font class="comment"> * Get access to an existing shared memory segment</font>
+00089 <font class="comment"> */</font>
+<a name="l00090"></a><a class="code" href="classNLMISC_1_1CSharedMemory.html#d1">00090</a> <font class="keywordtype">void</font> *CSharedMemory::accessSharedMemory( <a class="code" href="namespaceNLMISC.html#a176">TSharedMemId</a> sharedMemId )
+00091 {
+00092 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00093 <font class="preprocessor"></font>
+00094 <font class="comment">// Open the existing file mapping by name</font>
+00095 HANDLE hMapFile = OpenFileMapping( FILE_MAP_ALL_ACCESS, <font class="keyword">false</font>, sharedMemId );
+00096 <font class="keywordflow">if</font> ( hMapFile == NULL )
+00097 <font class="keywordflow">return</font> NULL;
+00098
+00099 <font class="comment">// Map the file into memory address space</font>
+00100 <font class="keywordtype">void</font> *accessAddress = MapViewOfFile( hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
+00101 AccessAddressesToHandles.insert( make_pair( accessAddress, hMapFile ) );
+00102 <font class="keywordflow">return</font> accessAddress;
+00103
+00104 <font class="preprocessor">#else</font>
+00105 <font class="preprocessor"></font>
+00106 <font class="comment">// Open an existing shared memory segment</font>
+00107 <font class="keywordtype">int</font> shmid = shmget( sharedMemId, 0, 0666 );
+00108 <font class="keywordflow">if</font> ( shmid == -1 )
+00109 <font class="keywordflow">return</font> NULL;
+00110
+00111 <font class="comment">// Map the segment into memory address space</font>
+00112 <font class="keywordtype">void</font> *accessAddress = (<font class="keywordtype">void</font>*)shmat( shmid, 0, 0 );
+00113 <font class="keywordflow">if</font> ( accessAddress == (<font class="keywordtype">void</font>*)-1 )
+00114 <font class="keywordflow">return</font> NULL;
+00115 <font class="keywordflow">else</font>
+00116 <font class="keywordflow">return</font> accessAddress;
+00117
+00118 <font class="preprocessor">#endif</font>
+00119 <font class="preprocessor"></font>}
+00120
+00121
+00122 <font class="comment">/*</font>
+00123 <font class="comment"> * Close a shared memory segment</font>
+00124 <font class="comment"> */</font>
+<a name="l00125"></a><a class="code" href="classNLMISC_1_1CSharedMemory.html#d2">00125</a> <font class="keywordtype">bool</font> CSharedMemory::closeSharedMemory( <font class="keywordtype">void</font> *accessAddress )
+00126 {
+00127 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00128 <font class="preprocessor"></font>
+00129 <font class="comment">// Unmap the file from memory address space</font>
+00130 <font class="keywordflow">if</font> ( UnmapViewOfFile( accessAddress ) == 0 )
+00131 <font class="keywordflow">return</font> <font class="keyword">false</font>;
+00132
+00133 <font class="comment">// Close the corresponding handle</font>
+00134 map&lt;void*,HANDLE&gt;::iterator im = AccessAddressesToHandles.find( accessAddress );
+00135 <font class="keywordflow">if</font> ( im != AccessAddressesToHandles.end() )
+00136 {
+00137 CloseHandle( (*im).second );
+00138 AccessAddressesToHandles.erase( im );
+00139 <font class="keywordflow">return</font> <font class="keyword">true</font>;
+00140 }
+00141 <font class="keywordflow">else</font>
+00142 {
+00143 <font class="keywordflow">return</font> <font class="keyword">false</font>;
+00144 }
+00145
+00146 <font class="preprocessor">#else</font>
+00147 <font class="preprocessor"></font>
+00148 <font class="comment">// Detach the shared memory segment</font>
+00149 <font class="keywordflow">return</font> ( shmdt( accessAddress ) != -1 );
+00150
+00151 <font class="preprocessor">#endif</font>
+00152 <font class="preprocessor"></font>}
+00153
+00154
+00155 <font class="comment">/*</font>
+00156 <font class="comment"> * Destroy a shared memory segment (to call only by the process that created the segment)</font>
+00157 <font class="comment"> * Note: does nothing under Windows, it is automatic.</font>
+00158 <font class="comment"> */</font>
+<a name="l00159"></a><a class="code" href="classNLMISC_1_1CSharedMemory.html#d3">00159</a> <font class="keywordtype">void</font> CSharedMemory::destroySharedMemory( <a class="code" href="namespaceNLMISC.html#a176">TSharedMemId</a> sharedMemId, <font class="keywordtype">bool</font> force )
+00160 {
+00161 <font class="preprocessor">#ifndef NL_OS_WINDOWS</font>
+00162 <font class="preprocessor"></font> <font class="comment">// Set the segment to auto-destroying (when the last process detaches)</font>
+00163 map&lt;TSharedMemId,int&gt;::iterator im = <a class="code" href="namespaceNLMISC.html#a202">SharedMemIdsToShmids</a>.find( sharedMemId );
+00164 <font class="keywordflow">if</font> ( im != <a class="code" href="namespaceNLMISC.html#a202">SharedMemIdsToShmids</a>.end() )
+00165 {
+00166 <font class="comment">// Destroy the segment created before</font>
+00167 shmctl( (*im).second, IPC_RMID, 0 );
+00168 <a class="code" href="namespaceNLMISC.html#a202">SharedMemIdsToShmids</a>.erase( im );
+00169 }
+00170 <font class="keywordflow">else</font> <font class="keywordflow">if</font> ( force )
+00171 {
+00172 <font class="comment">// Open and destroy the segment</font>
+00173 <font class="keywordtype">int</font> shmid = shmget( sharedMemId, 0, 0666 );
+00174 <font class="keywordflow">if</font> ( shmid != -1 )
+00175 {
+00176 <font class="comment">// Destroy the segment</font>
+00177 shmctl( shmid, IPC_RMID, 0 );
+00178 }
+00179 }
+00180 <font class="preprocessor">#endif</font>
+00181 <font class="preprocessor"></font>}
+00182
+00183
+00184 } <font class="comment">// NLMISC</font>
+</pre></div>
+
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