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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>NeL: NLMISC::CFastMutexMP class Reference</title>
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<h1>NLMISC::CFastMutexMP Class Reference</h1><code>#include <<a class="el" href="a06088.html">mutex.h</a>></code>
<p>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Fast mutex for multiprocessor implementation (not fairly). Used for multiprocessor critical section synchronisation. The mutex ARE NOT recursive (ie don't call <a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPa1">enter()</a> several times on the same mutex from the same thread without having called <a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPa3">leave()</a>) ; The threads use a spin system to wait a little time before be put to sleep. It waits using CPU time.<p>
Implementation notes:<ul>
<li>Implementated under WIN32</li><li>Other OS use CMutex</li></ul>
<p>
<pre class="fragment"><div> <a class="code" href="a02517.html#NLMISC_1_1CFastMutexMPa0">CFastMutexMP</a> m;
m.enter ();
<span class="comment">// do critical stuffs</span>
m.leave ();
*
</div></pre><dl compact><dt><b>Author:</b></dt><dd>Cyril 'Hulud' Corvazier <p>
Olivier Cado <p>
Nevrax France </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>2002, 2003 </dd></dl>
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00309">309</a> of file <a class="el" href="a06088.html">mutex.h</a>.<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPa0">CFastMutexMP</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <a href="#NLMISC_1_1CFastMutexMPa0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>__forceinline void </td><td class="memItemRight" valign=bottom><a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPa1">enter</a> () volatile</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPa2">init</a> () volatile</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Same as constructor, useful for init in a shared memory block. <a href="#NLMISC_1_1CFastMutexMPa2"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>__forceinline void </td><td class="memItemRight" valign=bottom><a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPa3">leave</a> () volatile</td></tr>
<tr><td colspan=2><br><h2>Private Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>volatile <a class="el" href="a04558.html#a11">uint32</a> </td><td class="memItemRight" valign=bottom><a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPr0">_Lock</a></td></tr>
</table>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMutexMPa0" doxytag="NLMISC::CFastMutexMP::CFastMutexMP" ></a><p>
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<td class="md" nowrap valign="top"> NLMISC::CFastMutexMP::CFastMutexMP </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [inline]</code></td>
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<p>
Constructor.
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00314">314</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
<div class="fragment"><pre>00314 : <a class="code" href="a02517.html#NLMISC_1_1CFastMutexMPr0">_Lock</a>(0) {}
</pre></div> </td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMutexMPa1" doxytag="NLMISC::CFastMutexMP::enter" ></a><p>
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<td class="md" nowrap valign="top"> __forceinline void NLMISC::CFastMutexMP::enter </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> volatile<code> [inline]</code></td>
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<p>
<p>
Definition at line <a class="el" href="a06088.html#l00320">320</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
References <a class="el" href="a05981.html#l00105">uint</a>.
<p>
<div class="fragment"><pre>00321 {
00322 <span class="comment">//std::cout << "Entering, Lock=" << _Lock << std::endl; </span>
00323 <span class="keywordflow">while</span> (CFastMutex::atomic_swap (&_Lock))
00324 {
00325 <span class="keyword">static</span> <a class="code" href="a04558.html#a15">uint</a> last = 0;
00326 <span class="keyword">static</span> <a class="code" href="a04558.html#a15">uint</a> _max = 30;
00327 <a class="code" href="a04558.html#a15">uint</a> spinMax = _max;
00328 <a class="code" href="a04558.html#a15">uint</a> lastSpins = last;
00329 <span class="keyword">volatile</span> <a class="code" href="a04558.html#a15">uint</a> temp = 17;
00330 <a class="code" href="a04558.html#a15">uint</a> i;
00331 <span class="keywordflow">for</span> (i = 0; i < spinMax; ++i)
00332 {
00333 <span class="keywordflow">if</span> (i < lastSpins/2 || <a class="code" href="a02517.html#NLMISC_1_1CFastMutexMPr0">_Lock</a>)
00334 {
00335 temp *= temp;
00336 temp *= temp;
00337 temp *= temp;
00338 temp *= temp;
00339 }
00340 <span class="keywordflow">else</span>
00341 {
00342 <span class="keywordflow">if</span> (!CFastMutex::atomic_swap(&_Lock))
00343 {
00344 last = i;
00345 _max = 1000;
00346 <span class="keywordflow">return</span>;
00347 }
00348 }
00349 }
00350
00351 _max = 30;
00352
00353 <span class="comment">// First test</span>
00354 <span class="keywordflow">for</span> (i = 0 ;; ++i)
00355 {
00356 <a class="code" href="a04558.html#a15">uint</a> wait_time = i + 6;
00357
00358 <span class="comment">// Increment wait time with a log function</span>
00359 <span class="keywordflow">if</span> (wait_time > 27)
00360 wait_time = 27;
00361
00362 <span class="comment">// Sleep</span>
00363 <span class="keywordflow">if</span> (wait_time <= 20)
00364 wait_time = 0;
00365 <span class="keywordflow">else</span>
00366 wait_time = 1 << (wait_time - 20);
00367
00368 <span class="keywordflow">if</span> (!CFastMutex::atomic_swap (&_Lock))
00369 <span class="keywordflow">break</span>;
00370
00371 <span class="preprocessor">#ifdef NL_OS_WINDOWS</span>
00372 <span class="preprocessor"></span> Sleep (wait_time);
00373 <span class="preprocessor">#else</span>
00374 <span class="preprocessor"></span> <span class="comment">//std::cout << "Sleeping i=" << i << std::endl;</span>
00375 usleep( wait_time*1000 );
00376 <span class="preprocessor">#endif </span>
00377 <span class="preprocessor"></span> }
00378 }
00379 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CFastMutexMPa2" doxytag="NLMISC::CFastMutexMP::init" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CFastMutexMP::init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> volatile<code> [inline]</code></td>
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<p>
Same as constructor, useful for init in a shared memory block.
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00317">317</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
<div class="fragment"><pre>00317 { <a class="code" href="a02517.html#NLMISC_1_1CFastMutexMPr0">_Lock</a> = 0; }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CFastMutexMPa3" doxytag="NLMISC::CFastMutexMP::leave" ></a><p>
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<td class="md" nowrap valign="top"> __forceinline void NLMISC::CFastMutexMP::leave </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> volatile<code> [inline]</code></td>
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</td>
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<p>
Definition at line <a class="el" href="a06088.html#l00382">382</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
<div class="fragment"><pre>00383 {
00384 <a class="code" href="a02517.html#NLMISC_1_1CFastMutexMPr0">_Lock</a> = 0;
00385 <span class="comment">//std::cout << "Leave" << std::endl;</span>
00386 }
</pre></div> </td>
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<hr><h2>Field Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMutexMPr0" doxytag="NLMISC::CFastMutexMP::_Lock" ></a><p>
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<td class="md" nowrap valign="top"> volatile <a class="el" href="a04558.html#a11">uint32</a> <a class="el" href="a02517.html#NLMISC_1_1CFastMutexMPr0">NLMISC::CFastMutexMP::_Lock</a><code> [private]</code>
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<p>
Definition at line <a class="el" href="a06088.html#l00389">389</a> of file <a class="el" href="a06088.html">mutex.h</a>. </td>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="a06088.html">mutex.h</a></ul>
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