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| <h1>reader_writer_lock.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span> |
| <a name="l00002"></a>00002 <span class="comment"> Copyright 2005-2010 Intel Corporation. All Rights Reserved.</span> |
| <a name="l00003"></a>00003 <span class="comment"></span> |
| <a name="l00004"></a>00004 <span class="comment"> The source code contained or described herein and all documents related</span> |
| <a name="l00005"></a>00005 <span class="comment"> to the source code ("Material") are owned by Intel Corporation or its</span> |
| <a name="l00006"></a>00006 <span class="comment"> suppliers or licensors. Title to the Material remains with Intel</span> |
| <a name="l00007"></a>00007 <span class="comment"> Corporation or its suppliers and licensors. The Material is protected</span> |
| <a name="l00008"></a>00008 <span class="comment"> by worldwide copyright laws and treaty provisions. No part of the</span> |
| <a name="l00009"></a>00009 <span class="comment"> Material may be used, copied, reproduced, modified, published, uploaded,</span> |
| <a name="l00010"></a>00010 <span class="comment"> posted, transmitted, distributed, or disclosed in any way without</span> |
| <a name="l00011"></a>00011 <span class="comment"> Intel's prior express written permission.</span> |
| <a name="l00012"></a>00012 <span class="comment"></span> |
| <a name="l00013"></a>00013 <span class="comment"> No license under any patent, copyright, trade secret or other</span> |
| <a name="l00014"></a>00014 <span class="comment"> intellectual property right is granted to or conferred upon you by</span> |
| <a name="l00015"></a>00015 <span class="comment"> disclosure or delivery of the Materials, either expressly, by</span> |
| <a name="l00016"></a>00016 <span class="comment"> implication, inducement, estoppel or otherwise. Any license under such</span> |
| <a name="l00017"></a>00017 <span class="comment"> intellectual property rights must be express and approved by Intel in</span> |
| <a name="l00018"></a>00018 <span class="comment"> writing.</span> |
| <a name="l00019"></a>00019 <span class="comment">*/</span> |
| <a name="l00020"></a>00020 |
| <a name="l00021"></a>00021 <span class="preprocessor">#ifndef __TBB_reader_writer_lock_H</span> |
| <a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#define __TBB_reader_writer_lock_H</span> |
| <a name="l00023"></a>00023 <span class="preprocessor"></span> |
| <a name="l00024"></a>00024 <span class="preprocessor">#include "tbb_thread.h"</span> |
| <a name="l00025"></a>00025 <span class="preprocessor">#include "tbb_allocator.h"</span> |
| <a name="l00026"></a>00026 <span class="preprocessor">#include "atomic.h"</span> |
| <a name="l00027"></a>00027 |
| <a name="l00028"></a>00028 <span class="keyword">namespace </span>tbb { |
| <a name="l00029"></a>00029 <span class="keyword">namespace </span>interface5 { |
| <a name="l00031"></a>00031 |
| <a name="l00034"></a><a class="code" href="a00186.html">00034</a> <span class="keyword">class </span><a class="code" href="a00186.html">reader_writer_lock</a> : tbb::internal::no_copy { |
| <a name="l00035"></a>00035 <span class="keyword">public</span>: |
| <a name="l00036"></a>00036 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="a00187.html">scoped_lock</a>; |
| <a name="l00037"></a>00037 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="a00188.html">scoped_lock_read</a>; |
| <a name="l00039"></a>00039 |
| <a name="l00074"></a><a class="code" href="a00186.html#6f921f0d7c1812ceb5674418c8b6ccaf">00074</a> <span class="keyword">enum</span> <a class="code" href="a00186.html#6f921f0d7c1812ceb5674418c8b6ccaf">status_t</a> { waiting_nonblocking, waiting, active, invalid }; |
| <a name="l00075"></a>00075 |
| <a name="l00077"></a><a class="code" href="a00186.html#c1431c4293e777efd9aab9a95c2a46e1">00077</a> <a class="code" href="a00186.html#c1431c4293e777efd9aab9a95c2a46e1">reader_writer_lock</a>() { |
| <a name="l00078"></a>00078 internal_construct(); |
| <a name="l00079"></a>00079 } |
| <a name="l00080"></a>00080 |
| <a name="l00082"></a><a class="code" href="a00186.html#5135f64f7b7339017f33d956445edbee">00082</a> <a class="code" href="a00186.html#5135f64f7b7339017f33d956445edbee">~reader_writer_lock</a>() { |
| <a name="l00083"></a>00083 internal_destroy(); |
| <a name="l00084"></a>00084 } |
| <a name="l00085"></a>00085 |
| <a name="l00087"></a>00087 |
| <a name="l00089"></a><a class="code" href="a00187.html">00089</a> <span class="keyword">class </span><a class="code" href="a00187.html">scoped_lock</a> : tbb::internal::no_copy { |
| <a name="l00090"></a>00090 <span class="keyword">public</span>: |
| <a name="l00091"></a>00091 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="a00186.html">reader_writer_lock</a>; |
| <a name="l00092"></a>00092 |
| <a name="l00094"></a><a class="code" href="a00187.html#cf19f20e082887c1bb0ba6b0911c3583">00094</a> <a class="code" href="a00187.html">scoped_lock</a>(<a class="code" href="a00186.html">reader_writer_lock</a>& <a class="code" href="a00186.html#2653d1a2d560059a51219a8ceab3ade9">lock</a>) { |
| <a name="l00095"></a>00095 internal_construct(<a class="code" href="a00186.html#2653d1a2d560059a51219a8ceab3ade9">lock</a>); |
| <a name="l00096"></a>00096 } |
| <a name="l00097"></a>00097 |
| <a name="l00099"></a><a class="code" href="a00187.html#70246e0260493625ff956fa5926fc71f">00099</a> <a class="code" href="a00187.html#70246e0260493625ff956fa5926fc71f">~scoped_lock</a>() { |
| <a name="l00100"></a>00100 internal_destroy(); |
| <a name="l00101"></a>00101 } |
| <a name="l00102"></a>00102 |
| <a name="l00103"></a>00103 <span class="keywordtype">void</span>* operator new(size_t s) { |
| <a name="l00104"></a>00104 <span class="keywordflow">return</span> tbb::internal::allocate_via_handler_v3(s); |
| <a name="l00105"></a>00105 } |
| <a name="l00106"></a>00106 <span class="keywordtype">void</span> operator delete(<span class="keywordtype">void</span>* p) { |
| <a name="l00107"></a>00107 tbb::internal::deallocate_via_handler_v3(p); |
| <a name="l00108"></a>00108 } |
| <a name="l00109"></a>00109 |
| <a name="l00110"></a>00110 <span class="keyword">private</span>: |
| <a name="l00112"></a>00112 <a class="code" href="a00186.html">reader_writer_lock</a> *<a class="code" href="a00172.html">mutex</a>; |
| <a name="l00114"></a>00114 scoped_lock* next; |
| <a name="l00116"></a>00116 <a class="code" href="a00143.html">atomic<status_t></a> status; |
| <a name="l00117"></a>00117 |
| <a name="l00119"></a>00119 scoped_lock(); |
| <a name="l00120"></a>00120 |
| <a name="l00121"></a>00121 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD internal_construct(<a class="code" href="a00186.html">reader_writer_lock</a>&); |
| <a name="l00122"></a>00122 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD internal_destroy(); |
| <a name="l00123"></a>00123 }; |
| <a name="l00124"></a>00124 |
| <a name="l00126"></a><a class="code" href="a00188.html">00126</a> <span class="keyword">class </span><a class="code" href="a00188.html">scoped_lock_read</a> : tbb::internal::no_copy { |
| <a name="l00127"></a>00127 <span class="keyword">public</span>: |
| <a name="l00128"></a>00128 <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="a00186.html">reader_writer_lock</a>; |
| <a name="l00129"></a>00129 |
| <a name="l00131"></a><a class="code" href="a00188.html#87ab0dc8f7216e6ba0f7acd6aec33064">00131</a> <a class="code" href="a00188.html">scoped_lock_read</a>(<a class="code" href="a00186.html">reader_writer_lock</a>& <a class="code" href="a00186.html#2653d1a2d560059a51219a8ceab3ade9">lock</a>) { |
| <a name="l00132"></a>00132 internal_construct(<a class="code" href="a00186.html#2653d1a2d560059a51219a8ceab3ade9">lock</a>); |
| <a name="l00133"></a>00133 } |
| <a name="l00134"></a>00134 |
| <a name="l00136"></a><a class="code" href="a00188.html#bd21c5f3d555d64d1de8658e15bf4966">00136</a> <a class="code" href="a00188.html#bd21c5f3d555d64d1de8658e15bf4966">~scoped_lock_read</a>() { |
| <a name="l00137"></a>00137 internal_destroy(); |
| <a name="l00138"></a>00138 } |
| <a name="l00139"></a>00139 |
| <a name="l00140"></a>00140 <span class="keywordtype">void</span>* operator new(size_t s) { |
| <a name="l00141"></a>00141 <span class="keywordflow">return</span> tbb::internal::allocate_via_handler_v3(s); |
| <a name="l00142"></a>00142 } |
| <a name="l00143"></a>00143 <span class="keywordtype">void</span> operator delete(<span class="keywordtype">void</span>* p) { |
| <a name="l00144"></a>00144 tbb::internal::deallocate_via_handler_v3(p); |
| <a name="l00145"></a>00145 } |
| <a name="l00146"></a>00146 |
| <a name="l00147"></a>00147 <span class="keyword">private</span>: |
| <a name="l00149"></a>00149 <a class="code" href="a00186.html">reader_writer_lock</a> *<a class="code" href="a00172.html">mutex</a>; |
| <a name="l00151"></a>00151 scoped_lock_read *next; |
| <a name="l00153"></a>00153 <a class="code" href="a00143.html">atomic<status_t></a> status; |
| <a name="l00154"></a>00154 |
| <a name="l00156"></a>00156 scoped_lock_read(); |
| <a name="l00157"></a>00157 |
| <a name="l00158"></a>00158 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD internal_construct(<a class="code" href="a00186.html">reader_writer_lock</a>&); |
| <a name="l00159"></a>00159 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD internal_destroy(); |
| <a name="l00160"></a>00160 }; |
| <a name="l00161"></a>00161 |
| <a name="l00163"></a>00163 |
| <a name="l00168"></a>00168 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD <a class="code" href="a00186.html#2653d1a2d560059a51219a8ceab3ade9">lock</a>(); |
| <a name="l00169"></a>00169 |
| <a name="l00171"></a>00171 |
| <a name="l00175"></a>00175 <span class="keywordtype">bool</span> __TBB_EXPORTED_METHOD <a class="code" href="a00186.html#721eb173e154ab38292273e9266a9b07">try_lock</a>(); |
| <a name="l00176"></a>00176 |
| <a name="l00178"></a>00178 |
| <a name="l00182"></a>00182 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD <a class="code" href="a00186.html#d9d16a24d9f6c3dada73c6b9ff214f5b">lock_read</a>(); |
| <a name="l00183"></a>00183 |
| <a name="l00185"></a>00185 |
| <a name="l00187"></a>00187 <span class="keywordtype">bool</span> __TBB_EXPORTED_METHOD <a class="code" href="a00186.html#595fb23952e3b89426b1f7938dea9b11">try_lock_read</a>(); |
| <a name="l00188"></a>00188 |
| <a name="l00190"></a>00190 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD <a class="code" href="a00186.html#5113b32689305599b2c36b5831547704">unlock</a>(); |
| <a name="l00191"></a>00191 |
| <a name="l00192"></a>00192 <span class="keyword">private</span>: |
| <a name="l00193"></a>00193 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD internal_construct(); |
| <a name="l00194"></a>00194 <span class="keywordtype">void</span> __TBB_EXPORTED_METHOD internal_destroy(); |
| <a name="l00195"></a>00195 |
| <a name="l00197"></a>00197 |
| <a name="l00198"></a>00198 <span class="keywordtype">bool</span> start_write(scoped_lock *); |
| <a name="l00200"></a>00200 <span class="keywordtype">void</span> set_next_writer(scoped_lock *w); |
| <a name="l00202"></a>00202 <span class="keywordtype">void</span> end_write(scoped_lock *); |
| <a name="l00204"></a>00204 <span class="keywordtype">bool</span> is_current_writer(); |
| <a name="l00205"></a>00205 |
| <a name="l00207"></a>00207 |
| <a name="l00208"></a>00208 <span class="keywordtype">void</span> start_read(scoped_lock_read *); |
| <a name="l00210"></a>00210 <span class="keywordtype">void</span> unblock_readers(); |
| <a name="l00212"></a>00212 <span class="keywordtype">void</span> end_read(); |
| <a name="l00213"></a>00213 |
| <a name="l00215"></a>00215 atomic<scoped_lock_read*> reader_head; |
| <a name="l00217"></a>00217 atomic<scoped_lock*> writer_head; |
| <a name="l00219"></a>00219 atomic<scoped_lock*> writer_tail; |
| <a name="l00221"></a>00221 tbb_thread::id my_current_writer; |
| <a name="l00223"></a>00223 atomic<unsigned> rdr_count_and_flags; |
| <a name="l00224"></a>00224 }; |
| <a name="l00225"></a>00225 |
| <a name="l00226"></a>00226 } <span class="comment">// namespace interface5</span> |
| <a name="l00227"></a>00227 |
| <a name="l00228"></a>00228 <span class="keyword">using</span> interface5::reader_writer_lock; |
| <a name="l00229"></a>00229 |
| <a name="l00230"></a>00230 } <span class="comment">// namespace tbb</span> |
| <a name="l00231"></a>00231 |
| <a name="l00232"></a>00232 <span class="preprocessor">#endif </span><span class="comment">/* __TBB_reader_writer_lock_H */</span> |
| </pre></div><hr> |
| <p></p> |
| Copyright © 2005-2010 Intel Corporation. All Rights Reserved. |
| <p></p> |
| Intel, Pentium, Intel Xeon, Itanium, Intel XScale and VTune are |
| registered trademarks or trademarks of Intel Corporation or its |
| subsidiaries in the United States and other countries. |
| <p></p> |
| * Other names and brands may be claimed as the property of others. |
