Sophie

Sophie

distrib > Mandriva > 2010.0 > i586 > media > contrib-release > by-pkgid > bad97183153701b09df5fae1052b1c30 > files > 4066

crystalspace-doc-1.2.1-5mdv2010.0.i586.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
<title>Crystal Space 1.2.1: csutil/threading/win32_mutex.h Source File (Crystal Space 1.2.1 Public API Reference)</title>
<link href="tabs.css" rel="stylesheet" type="text/css">
<link href="doxygen.css" rel="stylesheet" type="text/css">
</head><body>
<table border="0" cellpadding="0" cellspacing="0" width="100%" class="head">
 <tr height="59">
  <td class="head" width="202" valign="bottom" style="padding-left:0;"><a href="http://www.crystalspace3d.org/"><img src="csblur.png" width="236" height="59" alt="CrystalSpace" border="0"></a></td>
  <td class="head"><h2>Public API Reference</h2></td>
 </tr>
 <tr height="11">
  <td colspan="2" class="headshadow" valign="top" style="padding-left:0;"><img src="csblurb.png" width="236" height="11" alt="" border="0"></td>
 </tr>
</table>
<div class="content">
<!-- Generated by Doxygen 1.5.3 -->
<div class="tabs">
  <ul>
    <li><a href="index.html"><span>Main&nbsp;Page</span></a></li>
    <li><a href="modules.html"><span>Modules</span></a></li>
    <li><a href="namespaces.html"><span>Namespaces</span></a></li>
    <li><a href="classes.html"><span>Classes</span></a></li>
    <li class="current"><a href="files.html"><span>Files</span></a></li>
    <li><a href="pages.html"><span>Related&nbsp;Pages</span></a></li>
  </ul>
</div>
<h1>csutil/threading/win32_mutex.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 (C) 2006 by Marten Svanfeldt</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment">  This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment">  modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment">  License as published by the Free Software Foundation; either</span>
<a name="l00007"></a>00007 <span class="comment">  version 2 of the License, or (at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment">  This library is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment">  but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment">  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<a name="l00012"></a>00012 <span class="comment">  Library General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">  You should have received a copy of the GNU Library General Public</span>
<a name="l00015"></a>00015 <span class="comment">  License along with this library; if not, write to the Free</span>
<a name="l00016"></a>00016 <span class="comment">  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.</span>
<a name="l00017"></a>00017 <span class="comment">*/</span>
<a name="l00018"></a>00018 
<a name="l00019"></a>00019 <span class="preprocessor">#ifndef __CS_CSUTIL_THREADING_WIN32_MUTEX_H__</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSUTIL_THREADING_WIN32_MUTEX_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include "<a class="code" href="atomicops_8h.html" title="Basic low-level atomic operations for different processors.">csutil/threading/atomicops.h</a>"</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "csutil/threading/win32_apifuncs.h"</span>
<a name="l00024"></a>00024 
<a name="l00025"></a>00025 <span class="preprocessor">#if !defined(CS_PLATFORM_WIN32)</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#error "This file is only for Windows and requires you to include csysdefs.h before"</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="keyword">namespace </span>CS
<a name="l00030"></a>00030 {
<a name="l00031"></a>00031 <span class="keyword">namespace </span>Threading
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033 <span class="keyword">namespace </span>Implementation
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 
<a name="l00039"></a>00039   <span class="keyword">class </span>MutexBase
<a name="l00040"></a>00040   {
<a name="l00041"></a>00041   <span class="keyword">public</span>:
<a name="l00042"></a>00042     <span class="keywordtype">void</span> Initialize ()
<a name="l00043"></a>00043     {
<a name="l00044"></a>00044       activeFlag = 0;
<a name="l00045"></a>00045       semaphore = 0;
<a name="l00046"></a>00046     }
<a name="l00047"></a>00047 
<a name="l00048"></a>00048     <span class="keywordtype">void</span> Destroy ()
<a name="l00049"></a>00049     {
<a name="l00050"></a>00050       <span class="keywordtype">void</span>* oldSemaphore = AtomicOperations::Set (&amp;semaphore, (<span class="keywordtype">void</span>*)0);
<a name="l00051"></a>00051       <span class="keywordflow">if</span> (oldSemaphore)
<a name="l00052"></a>00052       {
<a name="l00053"></a>00053         Implementation::CloseHandle (semaphore);
<a name="l00054"></a>00054       }
<a name="l00055"></a>00055     }
<a name="l00056"></a>00056     
<a name="l00057"></a>00057     <span class="keywordtype">bool</span> IsLocked ()
<a name="l00058"></a>00058     {
<a name="l00059"></a>00059       <span class="keywordflow">return</span> AtomicOperations::Read (&amp;activeFlag) &gt; 0;
<a name="l00060"></a>00060     }
<a name="l00061"></a>00061 
<a name="l00062"></a>00062     <span class="keywordtype">bool</span> Lock ()
<a name="l00063"></a>00063     {
<a name="l00064"></a>00064       <span class="keywordflow">if</span> (AtomicOperations::Increment (&amp;activeFlag) != 1)
<a name="l00065"></a>00065       {
<a name="l00066"></a>00066         Implementation::WaitForSingleObject (GetSemaphore (), INFINITE);
<a name="l00067"></a>00067       }
<a name="l00068"></a>00068       <span class="keywordflow">return</span> IsLocked ();
<a name="l00069"></a>00069     }
<a name="l00070"></a>00070 
<a name="l00071"></a>00071     <span class="keywordtype">bool</span> TryLock ()
<a name="l00072"></a>00072     {
<a name="l00073"></a>00073       <span class="keywordflow">return</span> !AtomicOperations::CompareAndSet (&amp;activeFlag, 1, 0);
<a name="l00074"></a>00074     }
<a name="l00075"></a>00075 
<a name="l00076"></a>00076     <span class="keywordtype">void</span> Unlock ()
<a name="l00077"></a>00077     {
<a name="l00078"></a>00078       <span class="keywordflow">if</span> (AtomicOperations::Decrement (&amp;activeFlag) &gt; 0)
<a name="l00079"></a>00079       {
<a name="l00080"></a>00080         Implementation::ReleaseSemaphore (GetSemaphore (), 1, 0);
<a name="l00081"></a>00081       }
<a name="l00082"></a>00082     }
<a name="l00083"></a>00083 
<a name="l00084"></a>00084   <span class="keyword">private</span>:
<a name="l00085"></a>00085     <span class="keywordtype">void</span>* GetSemaphore ()
<a name="l00086"></a>00086     {
<a name="l00087"></a>00087       <span class="keywordtype">void</span>* currentSem = AtomicOperations::Read (&amp;semaphore);
<a name="l00088"></a>00088       <span class="keywordflow">if</span> (!currentSem)
<a name="l00089"></a>00089       {
<a name="l00090"></a>00090         <span class="comment">//Create a new semaphore and try to set it</span>
<a name="l00091"></a>00091         <span class="keywordtype">void</span>* <span class="keyword">const</span> newSem = Implementation::CreateSemaphoreA (0,0,1,0);
<a name="l00092"></a>00092         <span class="keywordtype">void</span>* <span class="keyword">const</span> oldSem = AtomicOperations::CompareAndSet (&amp;semaphore, 
<a name="l00093"></a>00093           newSem, 0);
<a name="l00094"></a>00094 
<a name="l00095"></a>00095         <span class="comment">//We already have one, use it</span>
<a name="l00096"></a>00096         <span class="keywordflow">if</span> (oldSem != 0)
<a name="l00097"></a>00097         {
<a name="l00098"></a>00098           Implementation::CloseHandle (newSem);
<a name="l00099"></a>00099           <span class="keywordflow">return</span> oldSem;
<a name="l00100"></a>00100         }
<a name="l00101"></a>00101         <span class="keywordflow">else</span>
<a name="l00102"></a>00102         {
<a name="l00103"></a>00103           <span class="comment">//We didn't have any before, so use our new semaphore</span>
<a name="l00104"></a>00104           <span class="keywordflow">return</span> newSem;
<a name="l00105"></a>00105         }
<a name="l00106"></a>00106       }
<a name="l00107"></a>00107       <span class="keywordflow">return</span> currentSem;
<a name="l00108"></a>00108     }
<a name="l00109"></a>00109 
<a name="l00110"></a>00110     <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> activeFlag; <span class="comment">//Lock flag for mutex</span>
<a name="l00111"></a>00111     <span class="keywordtype">void</span>* semaphore; <span class="comment">//Semaphore for being able to wait for</span>
<a name="l00112"></a>00112   };
<a name="l00113"></a>00113 
<a name="l00114"></a>00114 
<a name="l00118"></a>00118   <span class="keyword">class </span>RecursiveMutexBase
<a name="l00119"></a>00119   {
<a name="l00120"></a>00120   <span class="keyword">public</span>:
<a name="l00121"></a>00121     <span class="keywordtype">void</span> Initialize ()
<a name="l00122"></a>00122     {
<a name="l00123"></a>00123       recursionCount = 0;
<a name="l00124"></a>00124       lockingThreadID = 0;
<a name="l00125"></a>00125       mutex.Initialize ();
<a name="l00126"></a>00126     }
<a name="l00127"></a>00127 
<a name="l00128"></a>00128     <span class="keywordtype">void</span> Destroy ()
<a name="l00129"></a>00129     {
<a name="l00130"></a>00130       mutex.Destroy ();
<a name="l00131"></a>00131     }
<a name="l00132"></a>00132 
<a name="l00133"></a>00133     <span class="keywordtype">bool</span> IsLocked ()
<a name="l00134"></a>00134     {
<a name="l00135"></a>00135       <span class="keywordflow">return</span> mutex.IsLocked ();
<a name="l00136"></a>00136     }
<a name="l00137"></a>00137 
<a name="l00138"></a>00138     <span class="keywordtype">bool</span> Lock ()
<a name="l00139"></a>00139     {
<a name="l00140"></a>00140       <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> currentThreadID = (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>)Implementation::GetCurrentThreadId ();
<a name="l00141"></a>00141       <span class="keywordflow">if</span> (!TryRecursiveLock (currentThreadID))
<a name="l00142"></a>00142       {
<a name="l00143"></a>00143         mutex.Lock ();
<a name="l00144"></a>00144         AtomicOperations::Set (&amp;lockingThreadID, currentThreadID);
<a name="l00145"></a>00145         recursionCount = 1;
<a name="l00146"></a>00146       }
<a name="l00147"></a>00147       <span class="keywordflow">return</span> IsLocked ();
<a name="l00148"></a>00148     }
<a name="l00149"></a>00149 
<a name="l00150"></a>00150     <span class="keywordtype">bool</span> TryLock ()
<a name="l00151"></a>00151     {
<a name="l00152"></a>00152       <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> currentThreadID = (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>)Implementation::GetCurrentThreadId ();
<a name="l00153"></a>00153       <span class="keywordflow">return</span> TryRecursiveLock (currentThreadID) || 
<a name="l00154"></a>00154              TryNormalLock (currentThreadID);
<a name="l00155"></a>00155     }
<a name="l00156"></a>00156 
<a name="l00157"></a>00157     <span class="keywordtype">void</span> Unlock ()
<a name="l00158"></a>00158     {
<a name="l00159"></a>00159       <span class="keywordflow">if</span>(!--recursionCount)
<a name="l00160"></a>00160       {
<a name="l00161"></a>00161         AtomicOperations::Set (&amp;lockingThreadID, 0);
<a name="l00162"></a>00162         mutex.Unlock ();
<a name="l00163"></a>00163       }
<a name="l00164"></a>00164     }
<a name="l00165"></a>00165 
<a name="l00166"></a>00166   <span class="keyword">private</span>:
<a name="l00167"></a>00167     <span class="keywordtype">bool</span> TryRecursiveLock (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> currentThreadID)
<a name="l00168"></a>00168     {
<a name="l00169"></a>00169       <span class="keywordflow">if</span> (AtomicOperations::Read (&amp;lockingThreadID) == currentThreadID)
<a name="l00170"></a>00170       {
<a name="l00171"></a>00171         ++recursionCount;
<a name="l00172"></a>00172         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00173"></a>00173       }
<a name="l00174"></a>00174       <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00175"></a>00175     }
<a name="l00176"></a>00176 
<a name="l00177"></a>00177     <span class="keywordtype">bool</span> TryNormalLock (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> currentThreadID)
<a name="l00178"></a>00178     {
<a name="l00179"></a>00179       <span class="keywordflow">if</span> (mutex.TryLock ())
<a name="l00180"></a>00180       {
<a name="l00181"></a>00181         AtomicOperations::Set (&amp;lockingThreadID, currentThreadID);
<a name="l00182"></a>00182         recursionCount = 1;
<a name="l00183"></a>00183         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00184"></a>00184       }
<a name="l00185"></a>00185       <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00186"></a>00186     }
<a name="l00187"></a>00187 
<a name="l00188"></a>00188     MutexBase mutex; <span class="comment">//Non-recursive base-mutex</span>
<a name="l00189"></a>00189     <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> recursionCount;
<a name="l00190"></a>00190     <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> lockingThreadID;
<a name="l00191"></a>00191   }; 
<a name="l00192"></a>00192 
<a name="l00193"></a>00193 } <span class="comment">// namespace Implementation</span>
<a name="l00194"></a>00194 } <span class="comment">// namespace Threading</span>
<a name="l00195"></a>00195 } <span class="comment">// namespace CS</span>
<a name="l00196"></a>00196 
<a name="l00197"></a>00197 <span class="preprocessor">#endif // !defined(CS_PLATFORM_WIN32)</span>
<a name="l00198"></a>00198 <span class="preprocessor"></span>
<a name="l00199"></a>00199 <span class="preprocessor">#endif // __CS_CSUTIL_THREADING_WIN32_MUTEX_H__</span>
</pre></div><hr size="1"><address><small>Generated for Crystal Space 1.2.1 by 
<a href="http://www.doxygen.org/index.html">doxygen</a> 1.5.3 
</small></address> </div></body> </html>

Perl :: Catalyst :: PostgreSQL :: RPM Valid HTML 4.01 Transitional