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<h1>NLMISC::CFastMutex 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 implementation (not fairly) The mutex ARE NOT recursive (ie don't call <a class="el" href="a02516.html#NLMISC_1_1CFastMutexa1">enter()</a> several times on the same mutex from the same thread without having called <a class="el" href="a02516.html#NLMISC_1_1CFastMutexa3">leave()</a>) ; The threads ARE NOT woken-up in the same order as they were put to sleep. The threads ARE NOT woken-up using signals but using Sleep(). This mutex works but is not optimal for multiprocessors because if the mutex is locked, next enter will be sleeped without waiting a little.<p>
Implementation notes:<ul>
<li>Implementated under WIN32</li><li>Other OS use CMutex</li></ul>
<p>
Tested: OK on Windows and Linux single & multi-processor<p>
<pre class="fragment"><div> <a class="code" href="a02516.html#NLMISC_1_1CFastMutexa0">CFastMutex</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#l00194">194</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="a02516.html#NLMISC_1_1CFastMutexa0">CFastMutex</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <a href="#NLMISC_1_1CFastMutexa0"></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="a02516.html#NLMISC_1_1CFastMutexa1">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="a02516.html#NLMISC_1_1CFastMutexa2">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_1CFastMutexa2"></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="a02516.html#NLMISC_1_1CFastMutexa3">leave</a> () volatile</td></tr>
<tr><td colspan=2><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>__forceinline bool </td><td class="memItemRight" valign=bottom><a class="el" href="a02516.html#NLMISC_1_1CFastMutexe0">atomic_swap</a> (volatile <a class="el" href="a04558.html#a11">uint32</a> *lockPtr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Atomic swap. <a href="#NLMISC_1_1CFastMutexe0"></a><br><br></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="a02516.html#NLMISC_1_1CFastMutexr0">_Lock</a></td></tr>
</table>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMutexa0" doxytag="NLMISC::CFastMutex::CFastMutex" ></a><p>
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<td class="md" nowrap valign="top"> NLMISC::CFastMutex::CFastMutex </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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</td>
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</td>
<td>
<p>
Constructor.
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00199">199</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
References <a class="el" href="a06088.html#l00280">_Lock</a>.
<p>
<div class="fragment"><pre>00199 : <a class="code" href="a02516.html#NLMISC_1_1CFastMutexr0">_Lock</a>(0) {}
</pre></div> </td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMutexe0" doxytag="NLMISC::CFastMutex::atomic_swap" ></a><p>
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<td class="md" nowrap valign="top"> __forceinline bool NLMISC::CFastMutex::atomic_swap </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">volatile <a class="el" href="a04558.html#a11">uint32</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>lockPtr</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [inline, static]</code></td>
</tr>
</table>
</td>
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</table>
<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Atomic swap.
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00205">205</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
References <a class="el" href="a06088.html#l00127">ASM_ASWAP_FOR_GCC_XCHG</a>, and <a class="el" href="a05981.html#l00100">uint32</a>.
<p>
Referenced by <a class="el" href="a06088.html#l00238">enter()</a>.
<p>
<div class="fragment"><pre>00206 {
00207 <a class="code" href="a04558.html#a11">uint32</a> result;
00208 <span class="preprocessor">#ifdef NL_OS_WINDOWS</span>
00209 <span class="preprocessor"></span><span class="preprocessor">#ifdef NL_DEBUG_FAST</span>
00210 <span class="preprocessor"></span> <span class="comment">// Workaround for dumb inlining bug (returning of function goes into the choux): push/pop registers</span>
00211 __asm
00212 {
00213 push eax
00214 push ecx
00215 mov ecx,lockPtr
00216 mov eax,1
00217 xchg [ecx],eax
00218 mov [result],eax
00219 pop ecx
00220 pop eax
00221 }
00222 <span class="preprocessor">#else</span>
00223 <span class="preprocessor"></span> __asm
00224 {
00225 mov ecx,lockPtr
00226 mov eax,1
00227 xchg [ecx],eax
00228 mov [result],eax
00229 }
00230 <span class="preprocessor">#endif</span>
00231 <span class="preprocessor"></span><span class="preprocessor">#else</span>
00232 <span class="preprocessor"></span> <a class="code" href="a04665.html#a2">ASM_ASWAP_FOR_GCC_XCHG</a>
00233 <span class="preprocessor">#endif // NL_OS_WINDOWS</span>
00234 <span class="preprocessor"></span> <span class="keywordflow">return</span> result != 0;
00235 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CFastMutexa1" doxytag="NLMISC::CFastMutex::enter" ></a><p>
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<td class="md" nowrap valign="top"> __forceinline void NLMISC::CFastMutex::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>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00238">238</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
References <a class="el" href="a06088.html#l00280">_Lock</a>, <a class="el" href="a06088.html#l00205">atomic_swap()</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a05490.html#l00209">NLMISC::CBlockMemory< CNode >::__stl_alloc_changeEltSize()</a>, <a class="el" href="a05490.html#l00097">NLMISC::CBlockMemory< CNode >::allocate()</a>, <a class="el" href="a05490.html#l00147">NLMISC::CBlockMemory< CNode >::free()</a>, <a class="el" href="a05490.html#l00185">NLMISC::CBlockMemory< CNode >::purge()</a>, and <a class="el" href="a06768.html#l00444">RenderTriangle()</a>.
<p>
<div class="fragment"><pre>00239 {
00240 <span class="comment">//std::cout << "Entering, Lock=" << _Lock << std::endl; </span>
00241 <span class="keywordflow">if</span> (<a class="code" href="a02516.html#NLMISC_1_1CFastMutexe0">atomic_swap</a> (&_Lock))
00242 {
00243 <span class="comment">// First test</span>
00244 <a class="code" href="a04558.html#a15">uint</a> i;
00245 <span class="keywordflow">for</span> (i = 0 ;; ++i)
00246 {
00247 <a class="code" href="a04558.html#a15">uint</a> wait_time = i + 6;
00248
00249 <span class="comment">// Increment wait time with a log function</span>
00250 <span class="keywordflow">if</span> (wait_time > 27)
00251 wait_time = 27;
00252
00253 <span class="comment">// Sleep</span>
00254 <span class="keywordflow">if</span> (wait_time <= 20)
00255 wait_time = 0;
00256 <span class="keywordflow">else</span>
00257 wait_time = 1 << (wait_time - 20);
00258
00259 <span class="keywordflow">if</span> (!<a class="code" href="a02516.html#NLMISC_1_1CFastMutexe0">atomic_swap</a> (&_Lock))
00260 <span class="keywordflow">break</span>;
00261
00262 <span class="preprocessor">#ifdef NL_OS_WINDOWS</span>
00263 <span class="preprocessor"></span> Sleep (wait_time);
00264 <span class="preprocessor">#else</span>
00265 <span class="preprocessor"></span> <span class="comment">//std::cout << "Sleeping i=" << i << std::endl;</span>
00266 usleep( wait_time*1000 );
00267 <span class="preprocessor">#endif</span>
00268 <span class="preprocessor"></span> }
00269 }
00270 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CFastMutexa2" doxytag="NLMISC::CFastMutex::init" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CFastMutex::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>
</tr>
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<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
Same as constructor, useful for init in a shared memory block.
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00202">202</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
References <a class="el" href="a06088.html#l00280">_Lock</a>.
<p>
<div class="fragment"><pre>00202 { <a class="code" href="a02516.html#NLMISC_1_1CFastMutexr0">_Lock</a> = 0; }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CFastMutexa3" doxytag="NLMISC::CFastMutex::leave" ></a><p>
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<td class="md" nowrap valign="top"> __forceinline void NLMISC::CFastMutex::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>
<td>
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00273">273</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
References <a class="el" href="a06088.html#l00280">_Lock</a>.
<p>
Referenced by <a class="el" href="a05490.html#l00209">NLMISC::CBlockMemory< CNode >::__stl_alloc_changeEltSize()</a>, <a class="el" href="a05490.html#l00097">NLMISC::CBlockMemory< CNode >::allocate()</a>, <a class="el" href="a05490.html#l00147">NLMISC::CBlockMemory< CNode >::free()</a>, <a class="el" href="a05490.html#l00185">NLMISC::CBlockMemory< CNode >::purge()</a>, and <a class="el" href="a06768.html#l00444">RenderTriangle()</a>.
<p>
<div class="fragment"><pre>00274 {
00275 <a class="code" href="a02516.html#NLMISC_1_1CFastMutexr0">_Lock</a> = 0;
00276 <span class="comment">//std::cout << "Leave" << std::endl; </span>
00277 }
</pre></div> </td>
</tr>
</table>
<hr><h2>Field Documentation</h2>
<a class="anchor" name="NLMISC_1_1CFastMutexr0" doxytag="NLMISC::CFastMutex::_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="a02516.html#NLMISC_1_1CFastMutexr0">NLMISC::CFastMutex::_Lock</a><code> [private]</code>
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<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="a06088.html#l00280">280</a> of file <a class="el" href="a06088.html">mutex.h</a>.
<p>
Referenced by <a class="el" href="a06088.html#l00199">CFastMutex()</a>, <a class="el" href="a06088.html#l00238">enter()</a>, <a class="el" href="a06088.html#l00202">init()</a>, and <a class="el" href="a06088.html#l00273">leave()</a>. </td>
</tr>
</table>
<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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