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<div class="title">spinlock.h</div> </div>
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<div class="contents">
<a href="spinlock_8h.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">#ifndef _UBIXOS_SPINLOCK_H</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#define _UBIXOS_SPINLOCK_H</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"> 32</span> <span class="preprocessor">#include <<a class="code" href="include_2sys_2types_8h.html">sys/types.h</a>></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="spinlock_8h.html#a00de8f7e0b615f88335573ba3909583d"> 34</a></span> <span class="preprocessor">#define LOCKED 1</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="spinlock_8h.html#af0591d953a49374b660c9de8964825fe"> 35</a></span> <span class="preprocessor">#define UNLOCKED 0</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="spinlock_8h.html#a0fe85a4f3642683148b25916d6c5eafd"> 36</a></span> <span class="preprocessor">#define SPIN_LOCK_INITIALIZER {NULL, 0}</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="spinlock_8h.html#aef31df4fa10911959af449d9f3ccf78f"> 37</a></span> <span class="preprocessor">#define LLOCK_FLAG 1</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">//typedef volatile int spinLock_t;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="structspinLock.html"> 41</a></span> <span class="keyword">struct </span><a class="code" href="structspinLock.html">spinLock</a> {</div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="structspinLock.html#af857b66019e1f2a923d48b0fba2e7746"> 42</a></span>  <span class="keyword">struct </span><a class="code" href="structspinLock.html">spinLock</a> *<a class="code" href="structspinLock.html#af857b66019e1f2a923d48b0fba2e7746">next</a>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847"> 43</a></span>  <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> <a class="code" href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847">locked</a>;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</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"><a class="line" href="spinlock_8h.html#a205601d674593c0fff0a54719d27465b"> 46</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structspinLock.html">spinLock</a> *<a class="code" href="spinlock_8h.html#a205601d674593c0fff0a54719d27465b">spinLock_t</a>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="keyword">extern</span> <span class="keyword">struct </span><a class="code" href="structspinLock.html">spinLock</a> <a class="code" href="spinlock_8h.html#a265ad04ec8650ad0a46179cdaa01dd98">Master</a>;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#a3ed033ffdc33d480e77190d424149415">spinLockInit</a>(<a class="code" href="structspinLock.html">spinLock_t</a>);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#a02e11882c06e98ee0e7ff1a9b4626fb3">spinUnlock</a>(<a class="code" href="structspinLock.html">spinLock_t</a>);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keywordtype">int</span> <a class="code" href="spinlock_8h.html#aed6e978dc2762fbf062e37670b8fa04d">spinTryLock</a>(<a class="code" href="structspinLock.html">spinLock_t</a>);</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#a623e97c04239abcce11cdd2826525f2e">spinLock</a>(<a class="code" href="structspinLock.html">spinLock_t</a>);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keywordtype">void</span> <a class="code" href="spinlock_8h.html#a4a5b56fc59f6a63a4d6cfac573889789">spinLock_scheduler</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *); <span class="comment">/* Only use this spinlock in the sched. */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keywordtype">int</span> <a class="code" href="spinlock_8h.html#acba75fe5ed894dc88030f7458b114a94">spinLockLocked</a>(<a class="code" href="structspinLock.html">spinLock_t</a> *);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">/* Atomic exchange (of various sizes) */</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">static</span> <span class="keyword">inline</span> <a class="code" href="include_2sys_2types_8h.html#a8f25a50daf29ce2cee1ec038a4d744ea">u_long</a> xchg_64(<span class="keyword">volatile</span> <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> *ptr, <a class="code" href="include_2sys_2types_8h.html#a8f25a50daf29ce2cee1ec038a4d744ea">u_long</a> x) {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  __asm__ __volatile__(<span class="stringliteral">"xchgq %1,%0"</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  :<span class="stringliteral">"+r"</span> (x),</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="stringliteral">"+m"</span> (*ptr));</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">return</span> x;</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> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> xchg_32(<span class="keyword">volatile</span> <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> *ptr, <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> x) {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  __asm__ __volatile__(<span class="stringliteral">"xchgl %1,%0"</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  :<span class="stringliteral">"+r"</span> (x),</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="stringliteral">"+m"</span> (*ptr));</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>  <span class="keywordflow">return</span> x;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> }</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> xchg_16(<span class="keyword">volatile</span> <a class="code" href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a> *ptr, <a class="code" href="include_2sys_2types_8h.html#a281b4b5562236420969a830503b0ba19">uint16_t</a> x) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  __asm__ __volatile__(<span class="stringliteral">"xchgw %1,%0"</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  :<span class="stringliteral">"+r"</span> (x),</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="stringliteral">"+m"</span> (*ptr));</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> x;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">/* Test and set a bit */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">char</span> atomic_bitsetandtest(<span class="keywordtype">void</span> *ptr, <span class="keywordtype">int</span> x) {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">char</span> out;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  __asm__ __volatile__(<span class="stringliteral">"lock; bts %2,%1\n"</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="stringliteral">"sbb %0,%0\n"</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  :<span class="stringliteral">"=r"</span> (out), <span class="stringliteral">"=m"</span> (*(<span class="keyword">volatile</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> *)ptr)</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  :<span class="stringliteral">"Ir"</span> (x)</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  :<span class="stringliteral">"memory"</span>);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> out;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="preprocessor">#endif</span></div>
</div><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="ainclude_2sys_2types_8h_html_a8f25a50daf29ce2cee1ec038a4d744ea"><div class="ttname"><a href="include_2sys_2types_8h.html#a8f25a50daf29ce2cee1ec038a4d744ea">u_long</a></div><div class="ttdeci">unsigned long u_long</div><div class="ttdef"><b>Definition:</b> <a href="include_2sys_2types_8h_source.html#l00073">types.h:73</a></div></div>
<div class="ttc" id="aspinlock_8h_html_a4a5b56fc59f6a63a4d6cfac573889789"><div class="ttname"><a href="spinlock_8h.html#a4a5b56fc59f6a63a4d6cfac573889789">spinLock_scheduler</a></div><div class="ttdeci">void spinLock_scheduler(spinLock_t *)</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_a243edf7f3d81de2a9c7e3852768e5847"><div class="ttname"><a href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847">spinLock::locked</a></div><div class="ttdeci">uint32_t locked</div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00043">spinlock.h:43</a></div></div>
<div class="ttc" id="aspinlock_8h_html_a02e11882c06e98ee0e7ff1a9b4626fb3"><div class="ttname"><a href="spinlock_8h.html#a02e11882c06e98ee0e7ff1a9b4626fb3">spinUnlock</a></div><div class="ttdeci">void spinUnlock(spinLock_t)</div><div class="ttdef"><b>Definition:</b> <a href="i386_2spinlock_8c_source.html#l00059">spinlock.c:59</a></div></div>
<div class="ttc" id="ainclude_2sys_2types_8h_html"><div class="ttname"><a href="include_2sys_2types_8h.html">types.h</a></div></div>
<div class="ttc" id="aspinlock_8h_html_aed6e978dc2762fbf062e37670b8fa04d"><div class="ttname"><a href="spinlock_8h.html#aed6e978dc2762fbf062e37670b8fa04d">spinTryLock</a></div><div class="ttdeci">int spinTryLock(spinLock_t)</div><div class="ttdef"><b>Definition:</b> <a href="i386_2spinlock_8c_source.html#l00051">spinlock.c:51</a></div></div>
<div class="ttc" id="aspinlock_8h_html_acba75fe5ed894dc88030f7458b114a94"><div class="ttname"><a href="spinlock_8h.html#acba75fe5ed894dc88030f7458b114a94">spinLockLocked</a></div><div class="ttdeci">int spinLockLocked(spinLock_t *)</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="aspinlock_8h_html_a265ad04ec8650ad0a46179cdaa01dd98"><div class="ttname"><a href="spinlock_8h.html#a265ad04ec8650ad0a46179cdaa01dd98">Master</a></div><div class="ttdeci">struct spinLock Master</div><div class="ttdef"><b>Definition:</b> <a href="syscall__posix_8c_source.html#l00040">syscall_posix.c:40</a></div></div>
<div class="ttc" id="ainclude_2sys_2types_8h_html_a281b4b5562236420969a830503b0ba19"><div class="ttname"><a href="include_2sys_2types_8h.html#a281b4b5562236420969a830503b0ba19">uint16_t</a></div><div class="ttdeci">__uint16_t uint16_t</div><div class="ttdef"><b>Definition:</b> <a href="include_2sys_2types_8h_source.html#l00045">types.h:45</a></div></div>
<div class="ttc" id="astructspinLock_html_af857b66019e1f2a923d48b0fba2e7746"><div class="ttname"><a href="structspinLock.html#af857b66019e1f2a923d48b0fba2e7746">spinLock::next</a></div><div class="ttdeci">struct spinLock * next</div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00042">spinlock.h:42</a></div></div>
<div class="ttc" id="ainclude_2sys_2types_8h_html_a0238af00180b6d9278fa1c6aa790fdf4"><div class="ttname"><a href="include_2sys_2types_8h.html#a0238af00180b6d9278fa1c6aa790fdf4">uint32_t</a></div><div class="ttdeci">__uint32_t uint32_t</div><div class="ttdef"><b>Definition:</b> <a href="include_2sys_2types_8h_source.html#l00046">types.h:46</a></div></div>
<div class="ttc" id="aspinlock_8h_html_a3ed033ffdc33d480e77190d424149415"><div class="ttname"><a href="spinlock_8h.html#a3ed033ffdc33d480e77190d424149415">spinLockInit</a></div><div class="ttdeci">void spinLockInit(spinLock_t)</div><div class="ttdef"><b>Definition:</b> <a href="i386_2spinlock_8c_source.html#l00047">spinlock.c:47</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="aspinlock_8h_html_a205601d674593c0fff0a54719d27465b"><div class="ttname"><a href="spinlock_8h.html#a205601d674593c0fff0a54719d27465b">spinLock_t</a></div><div class="ttdeci">struct spinLock * spinLock_t</div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00046">spinlock.h:46</a></div></div>
<div class="ttc" id="aspinlock_8h_html_a623e97c04239abcce11cdd2826525f2e"><div class="ttname"><a href="spinlock_8h.html#a623e97c04239abcce11cdd2826525f2e">spinLock</a></div><div class="ttdeci">void spinLock(spinLock_t)</div><div class="ttdef"><b>Definition:</b> <a href="i386_2spinlock_8c_source.html#l00064">spinlock.c:64</a></div></div>
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