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<a class="el" href="dir_897b6a2d7bab147dd1db58381aad3984.html">src</a> » <a class="el" href="dir_832905b1f7f5feaf61a306b40c0ac817.html">sys</a> » <a class="el" href="dir_7efffd2b1fae7bb6f2aa85845c863494.html">kernel</a></div>
<h1>spinlock.c</h1><a href="spinlock_8c.html">Go to the documentation of this file.</a><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) 2002-2004 The UbixOS Project</span>
<a name="l00003"></a>00003 <span class="comment"> All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Redistribution and use in source and binary forms, with or without modification, are</span>
<a name="l00006"></a>00006 <span class="comment"> permitted provided that the following conditions are met:</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> Redistributions of source code must retain the above copyright notice, this list of</span>
<a name="l00009"></a>00009 <span class="comment"> conditions, the following disclaimer and the list of authors. Redistributions in binary</span>
<a name="l00010"></a>00010 <span class="comment"> form must reproduce the above copyright notice, this list of conditions, the following</span>
<a name="l00011"></a>00011 <span class="comment"> disclaimer and the list of authors in the documentation and/or other materials provided</span>
<a name="l00012"></a>00012 <span class="comment"> with the distribution. Neither the name of the UbixOS Project nor the names of its</span>
<a name="l00013"></a>00013 <span class="comment"> contributors may be used to endorse or promote products derived from this software</span>
<a name="l00014"></a>00014 <span class="comment"> without specific prior written permission.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY</span>
<a name="l00017"></a>00017 <span class="comment"> EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span>
<a name="l00018"></a>00018 <span class="comment"> MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL</span>
<a name="l00019"></a>00019 <span class="comment"> THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00020"></a>00020 <span class="comment"> SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span>
<a name="l00021"></a>00021 <span class="comment"> OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
<a name="l00022"></a>00022 <span class="comment"> HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR</span>
<a name="l00023"></a>00023 <span class="comment"> TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00024"></a>00024 <span class="comment"> SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment"> $Id: spinlock_8c-source.html 88 2016-01-12 00:11:29Z reddawg $</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">*****************************************************************************************/</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include <<a class="code" href="spinlock_8h.html">ubixos/spinlock.h</a>></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <<a class="code" href="sched_8h.html">ubixos/sched.h</a>></span>
<a name="l00032"></a>00032
<a name="l00033"></a><a class="code" href="spinlock_8c.html#2d24a3613a1841bfa55a7b235fb5d78f">00033</a> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#7092f143f66f5cab13a9d49ed42ab4d3">spinLockInit</a>(<a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> *lock) {
<a name="l00034"></a>00034 *lock = <a class="code" href="spinlock_8h.html#0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;
<a name="l00035"></a>00035 }
<a name="l00036"></a>00036
<a name="l00037"></a><a class="code" href="spinlock_8c.html#e29ab191c93f9ead066cb462dd2e7247">00037</a> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#dd996cbbb3b9826dd9c8cf02b66a4c65">spinUnlock</a>(<a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> *lock) {
<a name="l00038"></a>00038 *lock = 0x0;
<a name="l00039"></a>00039 <span class="comment">/*</span>
<a name="l00040"></a>00040 <span class="comment"> register int unlocked;</span>
<a name="l00041"></a>00041 <span class="comment"> asm volatile(</span>
<a name="l00042"></a>00042 <span class="comment"> "xchgl %0, %1"</span>
<a name="l00043"></a>00043 <span class="comment"> : "=&r" (unlocked), "=m" (*lock) : "0" (0)</span>
<a name="l00044"></a>00044 <span class="comment"> );</span>
<a name="l00045"></a>00045 <span class="comment"> */</span>
<a name="l00046"></a>00046 }
<a name="l00047"></a>00047
<a name="l00048"></a><a class="code" href="spinlock_8c.html#740766af5da58616f700fffab6768a78">00048</a> <span class="keywordtype">int</span> <a class="code" href="spinlock_8h.html#8f9173fadeddafa01754d6cbcc630198">spinTryLock</a>(<a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> *lock) {
<a name="l00049"></a>00049 <span class="keyword">register</span> <span class="keywordtype">int</span> locked;
<a name="l00050"></a>00050 <span class="keyword">asm</span> <span class="keyword">volatile</span>(<span class="stringliteral">"xchgl %0, %1"</span>
<a name="l00051"></a>00051 : <span class="stringliteral">"=&r"</span> (locked), <span class="stringliteral">"=m"</span> (*lock) : <span class="stringliteral">"0"</span> (1)
<a name="l00052"></a>00052 );
<a name="l00053"></a>00053 <span class="keywordflow">return</span>(!locked);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055
<a name="l00056"></a><a class="code" href="spinlock_8c.html#71f03d2ba55111c715b6068254847a53">00056</a> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#2cd9a4502680fb8e7f0fe6b029e558b1">spinLock</a>(<a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> *lock) {
<a name="l00057"></a>00057 <span class="keywordflow">while</span> (!<a class="code" href="spinlock_8h.html#8f9173fadeddafa01754d6cbcc630198">spinTryLock</a>(lock))
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 <span class="keywordflow">while</span> (*lock == 1)
<a name="l00060"></a>00060 <a class="code" href="sched_8h.html#08933fe6d593a1c78b9080359f15a0b7">sched_yield</a>();
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063
<a name="l00064"></a><a class="code" href="spinlock_8c.html#c208390343fe1dffbe7a192df35c329e">00064</a> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#4a5b56fc59f6a63a4d6cfac573889789">spinLock_scheduler</a>(<a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> *lock) {
<a name="l00065"></a>00065 <span class="keywordflow">while</span> (!<a class="code" href="spinlock_8h.html#8f9173fadeddafa01754d6cbcc630198">spinTryLock</a>(lock))
<a name="l00066"></a>00066 <span class="keywordflow">while</span> (*lock == 1);
<a name="l00067"></a>00067 }
<a name="l00068"></a>00068
<a name="l00069"></a>00069
<a name="l00070"></a><a class="code" href="spinlock_8c.html#6c0fe254de396873793ccc16915a6631">00070</a> <span class="keywordtype">int</span> <a class="code" href="spinlock_8h.html#cba75fe5ed894dc88030f7458b114a94">spinLockLocked</a>(<a class="code" href="spinlock_8h.html#a240e9404b4ede1e0d714610080d1176">spinLock_t</a> *lock) {
<a name="l00071"></a>00071 <span class="keywordflow">return</span>(*lock != 0);
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="comment">/***</span>
<a name="l00076"></a>00076 <span class="comment"> END</span>
<a name="l00077"></a>00077 <span class="comment"> ***/</span>
<a name="l00078"></a>00078
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Fri Dec 15 11:18:55 2006 for UbixOS V2 by
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