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228 lines
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<li class="navelem"><a class="el" href="a00222.html">tbb</a></li><li class="navelem"><a class="el" href="a00128.html">spin_rw_mutex_v3</a></li> </ul>
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<a href="a00283.html">List of all members</a> </div>
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<div class="title">tbb::spin_rw_mutex_v3 Class Reference<div class="ingroups"><a class="el" href="a00237.html">Synchronization</a></div></div> </div>
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</div><!--header-->
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<div class="contents">
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<p>Fast, unfair, spinning reader-writer lock with backoff and writer-preference.
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<a href="a00128.html#details">More...</a></p>
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<p><code>#include <spin_rw_mutex.h></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
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Classes</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="a00114.html">scoped_lock</a></td></tr>
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<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">The scoped locking pattern. <a href="a00114.html#details">More...</a><br/></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:ad30fc1ffa0a2b8134e177e02c5821d7f"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad30fc1ffa0a2b8134e177e02c5821d7f"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#ad30fc1ffa0a2b8134e177e02c5821d7f">spin_rw_mutex_v3</a> ()</td></tr>
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<tr class="memdesc:ad30fc1ffa0a2b8134e177e02c5821d7f"><td class="mdescLeft"> </td><td class="mdescRight">Construct unacquired mutex. <br/></td></tr>
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<tr class="separator:ad30fc1ffa0a2b8134e177e02c5821d7f"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:acc7cf2e4b14d3a2a591a3552d74ba99d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="acc7cf2e4b14d3a2a591a3552d74ba99d"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#acc7cf2e4b14d3a2a591a3552d74ba99d">~spin_rw_mutex_v3</a> ()</td></tr>
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<tr class="memdesc:acc7cf2e4b14d3a2a591a3552d74ba99d"><td class="mdescLeft"> </td><td class="mdescRight">Destructor asserts if the mutex is acquired, i.e. state is zero. <br/></td></tr>
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<tr class="separator:acc7cf2e4b14d3a2a591a3552d74ba99d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a51e207646300a4c242bb4aaa4e04e9b8"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a51e207646300a4c242bb4aaa4e04e9b8"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#a51e207646300a4c242bb4aaa4e04e9b8">lock</a> ()</td></tr>
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<tr class="memdesc:a51e207646300a4c242bb4aaa4e04e9b8"><td class="mdescLeft"> </td><td class="mdescRight">Acquire writer lock. <br/></td></tr>
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<tr class="separator:a51e207646300a4c242bb4aaa4e04e9b8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab6ec20b1ec43a49c8c2908984e35b5e8"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#ab6ec20b1ec43a49c8c2908984e35b5e8">try_lock</a> ()</td></tr>
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<tr class="memdesc:ab6ec20b1ec43a49c8c2908984e35b5e8"><td class="mdescLeft"> </td><td class="mdescRight">Try acquiring writer lock (non-blocking) <a href="#ab6ec20b1ec43a49c8c2908984e35b5e8">More...</a><br/></td></tr>
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<tr class="separator:ab6ec20b1ec43a49c8c2908984e35b5e8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ab04321ed2cdf12ac5825c54591028fc0"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab04321ed2cdf12ac5825c54591028fc0"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#ab04321ed2cdf12ac5825c54591028fc0">unlock</a> ()</td></tr>
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<tr class="memdesc:ab04321ed2cdf12ac5825c54591028fc0"><td class="mdescLeft"> </td><td class="mdescRight">Release lock. <br/></td></tr>
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<tr class="memitem:aa0e3bb644e9021d0f80ee36b03f228e4"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa0e3bb644e9021d0f80ee36b03f228e4"></a>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#aa0e3bb644e9021d0f80ee36b03f228e4">lock_read</a> ()</td></tr>
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<tr class="memdesc:aa0e3bb644e9021d0f80ee36b03f228e4"><td class="mdescLeft"> </td><td class="mdescRight">Acquire reader lock. <br/></td></tr>
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<tr class="separator:aa0e3bb644e9021d0f80ee36b03f228e4"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ac932f65b0b66320688e7957ce9c3e2c1"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#ac932f65b0b66320688e7957ce9c3e2c1">try_lock_read</a> ()</td></tr>
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<tr class="memdesc:ac932f65b0b66320688e7957ce9c3e2c1"><td class="mdescLeft"> </td><td class="mdescRight">Try acquiring reader lock (non-blocking) <a href="#ac932f65b0b66320688e7957ce9c3e2c1">More...</a><br/></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-attribs"></a>
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Static Public Attributes</h2></td></tr>
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<tr class="memitem:addc8223faacc1bb2cc8626b609ab2c49"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="addc8223faacc1bb2cc8626b609ab2c49"></a>
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static const bool </td><td class="memItemRight" valign="bottom"><b>is_rw_mutex</b> = true</td></tr>
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static const bool </td><td class="memItemRight" valign="bottom"><b>is_recursive_mutex</b> = false</td></tr>
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static const bool </td><td class="memItemRight" valign="bottom"><b>is_fair_mutex</b> = false</td></tr>
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Protected Types</h2></td></tr>
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<tr class="memitem:a27adc7d791dfaa4a60638313b9d1c1f4"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a27adc7d791dfaa4a60638313b9d1c1f4"></a>
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typedef intptr_t </td><td class="memItemRight" valign="bottom"><b>state_t</b></td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
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Protected Attributes</h2></td></tr>
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<tr class="memitem:aa28625051072472ccd8a2b19405d6fb3"><td class="memItemLeft" align="right" valign="top">state_t </td><td class="memItemRight" valign="bottom"><a class="el" href="a00128.html#aa28625051072472ccd8a2b19405d6fb3">state</a></td></tr>
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<tr class="memdesc:aa28625051072472ccd8a2b19405d6fb3"><td class="mdescLeft"> </td><td class="mdescRight">State of lock. <a href="#aa28625051072472ccd8a2b19405d6fb3">More...</a><br/></td></tr>
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<tr class="separator:aa28625051072472ccd8a2b19405d6fb3"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-static-attribs"></a>
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Static Protected Attributes</h2></td></tr>
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<tr class="memitem:aaeec59dde09fe92be196ecddb480777b"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aaeec59dde09fe92be196ecddb480777b"></a>
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static const state_t </td><td class="memItemRight" valign="bottom"><b>WRITER</b> = 1</td></tr>
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<tr class="separator:aaeec59dde09fe92be196ecddb480777b"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5b321914828e5e21baf24d58f32c66d5"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5b321914828e5e21baf24d58f32c66d5"></a>
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static const state_t </td><td class="memItemRight" valign="bottom"><b>WRITER_PENDING</b> = 2</td></tr>
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static const state_t </td><td class="memItemRight" valign="bottom"><b>READERS</b> = ~(WRITER | WRITER_PENDING)</td></tr>
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static const state_t </td><td class="memItemRight" valign="bottom"><b>ONE_READER</b> = 4</td></tr>
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<tr class="memitem:a6a811c72bd7e5ad6a3a9161ee05e298c"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a6a811c72bd7e5ad6a3a9161ee05e298c"></a>
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static const state_t </td><td class="memItemRight" valign="bottom"><b>BUSY</b> = WRITER | READERS</td></tr>
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<tr class="separator:a6a811c72bd7e5ad6a3a9161ee05e298c"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Fast, unfair, spinning reader-writer lock with backoff and writer-preference. </p>
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</div><h2 class="groupheader">Member Function Documentation</h2>
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<a class="anchor" id="ab6ec20b1ec43a49c8c2908984e35b5e8"></a>
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<td class="memname">bool tbb::spin_rw_mutex_v3::try_lock </td>
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<td>(</td>
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<td class="paramname">)</td><td></td>
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<td></td>
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</tr>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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</div><div class="memdoc">
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<p>Try acquiring writer lock (non-blocking) </p>
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<p>Return true if lock acquired; false otherwise. </p>
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</div>
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<a class="anchor" id="ac932f65b0b66320688e7957ce9c3e2c1"></a>
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<td class="memname">bool tbb::spin_rw_mutex_v3::try_lock_read </td>
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<td>(</td>
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<td class="paramname">)</td><td></td>
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<td></td>
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<p>Try acquiring reader lock (non-blocking) </p>
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<p>Return true if reader lock acquired; false otherwise. </p>
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</div>
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</div>
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<h2 class="groupheader">Member Data Documentation</h2>
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<a class="anchor" id="aa28625051072472ccd8a2b19405d6fb3"></a>
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<td class="memname">state_t tbb::spin_rw_mutex_v3::state</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">protected</span></span> </td>
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</div><div class="memdoc">
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<p>State of lock. </p>
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<p>Bit 0 = writer is holding lock Bit 1 = request by a writer to acquire lock (hint to readers to wait) Bit 2..N = number of readers holding lock </p>
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<p>Referenced by <a class="el" href="a00114.html#a99e279a995a51abfb87b865e886949f8">tbb::spin_rw_mutex_v3::scoped_lock::release()</a>, and <a class="el" href="a00128.html#ab04321ed2cdf12ac5825c54591028fc0">unlock()</a>.</p>
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</div>
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</div>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li>spin_rw_mutex.h</li>
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</ul>
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</div><!-- contents -->
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<hr>
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<p></p>
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Copyright © 2005-2014 Intel Corporation. All Rights Reserved.
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<p></p>
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Intel, Pentium, Intel Xeon, Itanium, Intel XScale and VTune are
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registered trademarks or trademarks of Intel Corporation or its
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subsidiaries in the United States and other countries.
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<p></p>
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* Other names and brands may be claimed as the property of others.
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