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<h1>csutil/threading/atomicops_sparc.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_ATOMICOPS_SPARC_H__</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span><span class="preprocessor">#define __CS_CSUTIL_ATOMICOPS_SPARC_H__</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span>
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef DOXYGEN_RUN</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span>
<a name="l00024"></a>00024 <span class="keyword">namespace </span>CS
<a name="l00025"></a>00025 {
<a name="l00026"></a>00026 <span class="keyword">namespace </span>Threading
<a name="l00027"></a>00027 {
<a name="l00028"></a>00028   <span class="keyword">class </span>AtomicOperationsSparc
<a name="l00029"></a>00029   {
<a name="l00030"></a>00030   <span class="keyword">public</span>:
<a name="l00031"></a>00031     <span class="keyword">inline</span> <span class="keyword">static</span> <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> Set (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>* target, <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> value)
<a name="l00032"></a>00032     {
<a name="l00033"></a>00033       *<span class="keyword">const_cast&lt;</span><span class="keyword">volatile </span><a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>*<span class="keyword">&gt;</span> (target) = value;
<a name="l00034"></a>00034       __asm__ __volatile__
<a name="l00035"></a>00035         (
<a name="l00036"></a>00036         <span class="stringliteral">"membar #StoreStore | #StoreLoad"</span>
<a name="l00037"></a>00037         : : : <span class="stringliteral">"memory"</span>
<a name="l00038"></a>00038         );
<a name="l00039"></a>00039       <span class="keywordflow">return</span> value;
<a name="l00040"></a>00040     }
<a name="l00041"></a>00041 
<a name="l00042"></a>00042     <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span>* Set (<span class="keywordtype">void</span>** target, <span class="keywordtype">void</span>* value)
<a name="l00043"></a>00043     {
<a name="l00044"></a>00044       <span class="keywordflow">return</span> (<span class="keywordtype">void</span>*)Set ((<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>*)target, (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>)value);
<a name="l00045"></a>00045     }
<a name="l00046"></a>00046 
<a name="l00047"></a>00047     <span class="keyword">inline</span> <span class="keyword">static</span> <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> CompareAndSet (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>* target, <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> value,
<a name="l00048"></a>00048       <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> comparand)
<a name="l00049"></a>00049     {
<a name="l00050"></a>00050       <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> prev;
<a name="l00051"></a>00051 
<a name="l00052"></a>00052       __asm__ __volatile__ 
<a name="l00053"></a>00053         (
<a name="l00054"></a>00054         <span class="stringliteral">"cas [%1],%2,%0"</span>
<a name="l00055"></a>00055         : <span class="stringliteral">"+r"</span> (value)
<a name="l00056"></a>00056         : <span class="stringliteral">"r"</span> (target), <span class="stringliteral">"r"</span> (comparand)
<a name="l00057"></a>00057         );
<a name="l00058"></a>00058 
<a name="l00059"></a>00059       <span class="keywordflow">return</span> prev;
<a name="l00060"></a>00060     }
<a name="l00061"></a>00061 
<a name="l00062"></a>00062     <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">void</span>* CompareAndSet (<span class="keywordtype">void</span>** target, <span class="keywordtype">void</span>* value,
<a name="l00063"></a>00063       <span class="keywordtype">void</span>* comparand)
<a name="l00064"></a>00064     {
<a name="l00065"></a>00065       <span class="keywordflow">return</span> (<span class="keywordtype">void</span>*)CompareAndSet ((<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>*)target, (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>)value, 
<a name="l00066"></a>00066         (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>)comparand);
<a name="l00067"></a>00067     }
<a name="l00068"></a>00068 
<a name="l00069"></a>00069     <span class="keyword">inline</span> <span class="keyword">static</span> <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> Increment (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>* target, <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> incr = 1)
<a name="l00070"></a>00070     {
<a name="l00071"></a>00071       <span class="comment">//@@Potentially dangerous code, needs to be revisited</span>
<a name="l00072"></a>00072       <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> prevValue, currValue, nextValue;
<a name="l00073"></a>00073       <span class="keywordflow">do</span> 
<a name="l00074"></a>00074       {
<a name="l00075"></a>00075         __asm__ __volatile__
<a name="l00076"></a>00076           (
<a name="l00077"></a>00077           <span class="stringliteral">"membar #StoreLoad | #LoadLoad"</span>
<a name="l00078"></a>00078           : : : <span class="stringliteral">"memory"</span>
<a name="l00079"></a>00079           );
<a name="l00080"></a>00080 
<a name="l00081"></a>00081         currValue = *target;
<a name="l00082"></a>00082         nextValue = currValue + incr;
<a name="l00083"></a>00083         prevValue = CompareAndSet (target, nextValue, currValue);
<a name="l00084"></a>00084       } <span class="keywordflow">while</span>(prevValue == currValue);
<a name="l00085"></a>00085       <span class="keywordflow">return</span> nextValue;
<a name="l00086"></a>00086     }
<a name="l00087"></a>00087 
<a name="l00088"></a>00088     <span class="keyword">inline</span> <span class="keyword">static</span> <a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a> Decrement (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>* target)
<a name="l00089"></a>00089     {
<a name="l00090"></a>00090       <span class="keywordflow">return</span> (<a class="code" href="group__util.html#g56f1a81c92849566ae864511088eb7e8" title="signed 32-bit integer (-2 147 483 648..2 147 483 647)">int32</a>)Increment (target, -1);
<a name="l00091"></a>00091     }
<a name="l00092"></a>00092   };
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095 
<a name="l00096"></a>00096 <span class="preprocessor">#endif // DOXYGEN_RUN</span>
<a name="l00097"></a>00097 <span class="preprocessor"></span>
<a name="l00098"></a>00098 <span class="preprocessor">#endif // __CS_CSUTIL_ATOMICOPS_SPARC_H__</span>
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