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<div class="title">spinlock.c</div> </div>
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<a href="armv6_2spinlock_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2002-2018 The UbixOS Project.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This was developed by Christopher W. Olsen for the UbixOS Project.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification, are permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * provided that the following conditions are met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * 1) Redistributions of source code must retain the above copyright notice, this list of</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * conditions, the following disclaimer and the list of authors.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * 2) Redistributions in binary form must reproduce the above copyright notice, this list of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * conditions, the following disclaimer and the list of authors in the documentation and/or</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * other materials provided with the distribution.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * endorse or promote products derived from this software without specific prior written</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * permission.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <<a class="code" href="spinlock_8h.html">ubixos/spinlock.h</a>></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <<a class="code" href="sched_8h.html">ubixos/sched.h</a>></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  </div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="armv6_2spinlock_8c.html#a2d24a3613a1841bfa55a7b235fb5d78f"> 32</a></span> <span class="keywordtype">void</span> <a class="code" href="armv6_2spinlock_8c.html#a2d24a3613a1841bfa55a7b235fb5d78f">spinLockInit</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *lock) {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  *lock = <a class="code" href="spinlock_8h.html#a0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a>;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  }</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="armv6_2spinlock_8c.html#ae29ab191c93f9ead066cb462dd2e7247"> 36</a></span> <span class="keywordtype">void</span> <a class="code" href="armv6_2spinlock_8c.html#ae29ab191c93f9ead066cb462dd2e7247">spinUnlock</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *lock) {</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  *lock = 0x0;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> register int unlocked;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> asm volatile(</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> "xchgl %0, %1"</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> : "=&r" (unlocked), "=m" (*lock) : "0" (0)</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> );</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="armv6_2spinlock_8c.html#a740766af5da58616f700fffab6768a78"> 47</a></span> <span class="keywordtype">int</span> <a class="code" href="armv6_2spinlock_8c.html#a740766af5da58616f700fffab6768a78">spinTryLock</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *lock) {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">register</span> <span class="keywordtype">int</span> locked;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">asm</span> <span class="keyword">volatile</span>(<span class="stringliteral">"xchgl %0, %1"</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  : <span class="stringliteral">"=&r"</span> (locked), <span class="stringliteral">"=m"</span> (*lock) : <span class="stringliteral">"0"</span> (1)</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  );</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span>(!locked);</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="armv6_2spinlock_8c.html#a71f03d2ba55111c715b6068254847a53"> 55</a></span> <span class="keywordtype">void</span> <a class="code" href="armv6_2spinlock_8c.html#a71f03d2ba55111c715b6068254847a53">spinLock</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *lock) {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">while</span> (!<a class="code" href="armv6_2spinlock_8c.html#a740766af5da58616f700fffab6768a78">spinTryLock</a>(lock))</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  {</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">while</span> (*lock == 1)</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="armv6_2sched_8c.html#a08933fe6d593a1c78b9080359f15a0b7">sched_yield</a>();</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  }</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> }</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="spinlock_8h.html#a4a5b56fc59f6a63a4d6cfac573889789"> 63</a></span> <span class="keywordtype">void</span> <a class="code" href="armv6_2spinlock_8c.html#ac208390343fe1dffbe7a192df35c329e">spinLock_scheduler</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *lock) {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">while</span> (!<a class="code" href="armv6_2spinlock_8c.html#a740766af5da58616f700fffab6768a78">spinTryLock</a>(lock))</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">while</span> (*lock == 1);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
<div class="line"><a name="l00069"></a><span class="lineno"><a class="line" href="spinlock_8h.html#acba75fe5ed894dc88030f7458b114a94"> 69</a></span> <span class="keywordtype">int</span> <a class="code" href="armv6_2spinlock_8c.html#a6c0fe254de396873793ccc16915a6631">spinLockLocked</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *lock) {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span>(*lock != 0);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">/***</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> END</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> ***/</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
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<div class="ttc" id="aarmv6_2spinlock_8c_html_a2d24a3613a1841bfa55a7b235fb5d78f"><div class="ttname"><a href="armv6_2spinlock_8c.html#a2d24a3613a1841bfa55a7b235fb5d78f">spinLockInit</a></div><div class="ttdeci">void spinLockInit(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2spinlock_8c_source.html#l00032">spinlock.c:32</a></div></div>
<div class="ttc" id="aspinlock_8h_html"><div class="ttname"><a href="spinlock_8h.html">spinlock.h</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_ae29ab191c93f9ead066cb462dd2e7247"><div class="ttname"><a href="armv6_2spinlock_8c.html#ae29ab191c93f9ead066cb462dd2e7247">spinUnlock</a></div><div class="ttdeci">void spinUnlock(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2spinlock_8c_source.html#l00036">spinlock.c:36</a></div></div>
<div class="ttc" id="aspinlock_8h_html_a0fe85a4f3642683148b25916d6c5eafd"><div class="ttname"><a href="spinlock_8h.html#a0fe85a4f3642683148b25916d6c5eafd">SPIN_LOCK_INITIALIZER</a></div><div class="ttdeci">#define SPIN_LOCK_INITIALIZER</div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00036">spinlock.h:36</a></div></div>
<div class="ttc" id="asched_8h_html"><div class="ttname"><a href="sched_8h.html">sched.h</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_a71f03d2ba55111c715b6068254847a53"><div class="ttname"><a href="armv6_2spinlock_8c.html#a71f03d2ba55111c715b6068254847a53">spinLock</a></div><div class="ttdeci">void spinLock(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2spinlock_8c_source.html#l00055">spinlock.c:55</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_a6c0fe254de396873793ccc16915a6631"><div class="ttname"><a href="armv6_2spinlock_8c.html#a6c0fe254de396873793ccc16915a6631">spinLockLocked</a></div><div class="ttdeci">int spinLockLocked(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2spinlock_8c_source.html#l00069">spinlock.c:69</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_ac208390343fe1dffbe7a192df35c329e"><div class="ttname"><a href="armv6_2spinlock_8c.html#ac208390343fe1dffbe7a192df35c329e">spinLock_scheduler</a></div><div class="ttdeci">void spinLock_scheduler(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2spinlock_8c_source.html#l00063">spinlock.c:63</a></div></div>
<div class="ttc" id="astructspinLock_html"><div class="ttname"><a href="structspinLock.html">spinLock</a></div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00041">spinlock.h:41</a></div></div>
<div class="ttc" id="aarmv6_2spinlock_8c_html_a740766af5da58616f700fffab6768a78"><div class="ttname"><a href="armv6_2spinlock_8c.html#a740766af5da58616f700fffab6768a78">spinTryLock</a></div><div class="ttdeci">int spinTryLock(spinLock_t *lock)</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2spinlock_8c_source.html#l00047">spinlock.c:47</a></div></div>
<div class="ttc" id="aarmv6_2sched_8c_html_a08933fe6d593a1c78b9080359f15a0b7"><div class="ttname"><a href="armv6_2sched_8c.html#a08933fe6d593a1c78b9080359f15a0b7">sched_yield</a></div><div class="ttdeci">void sched_yield()</div><div class="ttdef"><b>Definition:</b> <a href="armv6_2sched_8c_source.html#l00244">sched.c:244</a></div></div>
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