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<div class="title">spinlock.c</div> </div>
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<a href="i386_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="__null_8h.html">sys/_null.h</a>></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <<a class="code" href="spinlock_8h.html">ubixos/spinlock.h</a>></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <<a class="code" href="sched_8h.html">ubixos/sched.h</a>></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <<a class="code" href="string_8h.html">string.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="i386_2spinlock_8c.html#a97c020c88ee892bb5a3055d5a68c9788"> 34</a></span> <span class="preprocessor">#define atomic_xadd(P, V) __sync_fetch_and_add((P), (V))</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#a2ecfcce98539a0b972d6fa2586c4e67f"> 35</a></span> <span class="preprocessor">#define cmpxchg(P, O, N) __sync_val_compare_and_swap((P), (O), (N))</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#a45a583ebc7ce181c15688c871f955e98"> 36</a></span> <span class="preprocessor">#define atomic_inc(P) __sync_add_and_fetch((P), 1)</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#a59c16c0e6ca2a4509a89b4095897f29f"> 37</a></span> <span class="preprocessor">#define atomic_dec(P) __sync_add_and_fetch((P), -1)</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#a98eeefbec68bcb915a01f12e4ebdefd5"> 38</a></span> <span class="preprocessor">#define atomic_add(P, V) __sync_add_and_fetch((P), (V))</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#ac8aeecdc7ff00f1c46d5a91a73db87dd"> 39</a></span> <span class="preprocessor">#define atomic_set_bit(P, V) __sync_or_and_fetch((P), 1<<(V))</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#ac3b21a79504f9ee98f451f9f7092170d"> 40</a></span> <span class="preprocessor">#define atomic_clear_bit(P, V) __sync_and_and_fetch((P), ~(1<<(V)))</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#a53290ac2df2384738b8769c76622f803"> 42</a></span> <span class="preprocessor">#define barrier() asm volatile("": : :"memory")</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">/* Pause instruction to prevent excess processor bus usage */</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="i386_2spinlock_8c.html#a89af7a9ebf21399bcbd8e892b6f3d41a"> 45</a></span> <span class="preprocessor">#define cpu_relax() asm volatile("pause\n": : :"memory")</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="spinlock_8h.html#a3ed033ffdc33d480e77190d424149415"> 47</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="l00048"></a><span class="lineno"> 48</span>  <a class="code" href="string_8h.html#ace4b911463887af5e748326323e99a23">memset</a>(lock, 0x0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structspinLock.html">spinLock</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>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="spinlock_8h.html#aed6e978dc2762fbf062e37670b8fa04d"> 51</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="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">if</span> (!<a class="code" href="i386_2spinlock_8c.html#a2ecfcce98539a0b972d6fa2586c4e67f">cmpxchg</a>(&lock-><a class="code" href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847">locked</a>, <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, <a class="code" href="spinlock_8h.html#aef31df4fa10911959af449d9f3ccf78f">LLOCK_FLAG</a>))</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> 0;</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="comment">/* Failure! */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span> <a class="code" href="spinlock_8h.html#a00de8f7e0b615f88335573ba3909583d">LOCKED</a>;</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>  </div>
<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="spinlock_8h.html#a02e11882c06e98ee0e7ff1a9b4626fb3"> 59</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="l00060"></a><span class="lineno"> 60</span>  <a class="code" href="i386_2spinlock_8c.html#a53290ac2df2384738b8769c76622f803">barrier</a>();</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  lock-><a class="code" href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847">locked</a> = 0x0;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> }</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  </div>
<div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="spinlock_8h.html#a623e97c04239abcce11cdd2826525f2e"> 64</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="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">while</span> (1) {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span> (!xchg_32(&lock-><a class="code" href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847">locked</a>, <a class="code" href="spinlock_8h.html#a00de8f7e0b615f88335573ba3909583d">LOCKED</a>))</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">while</span> (lock-><a class="code" href="structspinLock.html#a243edf7f3d81de2a9c7e3852768e5847">locked</a> == 1)</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="armv6_2sched_8c.html#a08933fe6d593a1c78b9080359f15a0b7">sched_yield</a>();</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</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><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<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="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="astring_8h_html"><div class="ttname"><a href="string_8h.html">string.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_aef31df4fa10911959af449d9f3ccf78f"><div class="ttname"><a href="spinlock_8h.html#aef31df4fa10911959af449d9f3ccf78f">LLOCK_FLAG</a></div><div class="ttdeci">#define LLOCK_FLAG</div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00037">spinlock.h:37</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="aspinlock_8h_html_a00de8f7e0b615f88335573ba3909583d"><div class="ttname"><a href="spinlock_8h.html#a00de8f7e0b615f88335573ba3909583d">LOCKED</a></div><div class="ttdeci">#define LOCKED</div><div class="ttdef"><b>Definition:</b> <a href="spinlock_8h_source.html#l00034">spinlock.h:34</a></div></div>
<div class="ttc" id="ai386_2spinlock_8c_html_a2ecfcce98539a0b972d6fa2586c4e67f"><div class="ttname"><a href="i386_2spinlock_8c.html#a2ecfcce98539a0b972d6fa2586c4e67f">cmpxchg</a></div><div class="ttdeci">#define cmpxchg(P, O, N)</div><div class="ttdef"><b>Definition:</b> <a href="i386_2spinlock_8c_source.html#l00035">spinlock.c:35</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="ai386_2spinlock_8c_html_a53290ac2df2384738b8769c76622f803"><div class="ttname"><a href="i386_2spinlock_8c.html#a53290ac2df2384738b8769c76622f803">barrier</a></div><div class="ttdeci">#define barrier()</div><div class="ttdef"><b>Definition:</b> <a href="i386_2spinlock_8c_source.html#l00042">spinlock.c:42</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="astring_8h_html_ace4b911463887af5e748326323e99a23"><div class="ttname"><a href="string_8h.html#ace4b911463887af5e748326323e99a23">memset</a></div><div class="ttdeci">void * memset(void *dst, int c, size_t length)</div></div>
<div class="ttc" id="a__null_8h_html"><div class="ttname"><a href="__null_8h.html">_null.h</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>
<div class="ttc" id="afat__string_8h_html_a070d2ce7b6bb7e5c05602aa8c308d0c4"><div class="ttname"><a href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a></div><div class="ttdeci">#define NULL</div><div class="ttdef"><b>Definition:</b> <a href="fat__string_8h_source.html#l00017">fat_string.h:17</a></div></div>
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