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<a href="rwlock_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/**</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * @file rwlock.h</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * @brief Read/write lock synchronization primitive.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * @author plutoo, SciresM</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * @copyright libnx Authors</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> */</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &quot;../kernel/mutex.h&quot;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &quot;../kernel/condvar.h&quot;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"></span> </div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">/// Read/write lock structure.</span></div>
<div class="foldopen" id="foldopen00012" data-start="{" data-end="};">
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"><a class="line" href="structRwLock.html"> 12</a></span><span class="comment"></span><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> <a class="code hl_typedef" href="mutex_8h.html#a2d649c880d4330dc891cda67837eb897">Mutex</a> mutex;</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> <a class="code hl_typedef" href="condvar_8h.html#aae8dd0591cb6fe4a1077118947220f55">CondVar</a> condvar_reader_wait;</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> <a class="code hl_typedef" href="condvar_8h.html#aae8dd0591cb6fe4a1077118947220f55">CondVar</a> condvar_writer_wait;</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> <a class="code hl_typedef" href="types_8h.html#afaa62991928fb9fb18ff0db62a040aba">u32</a> read_lock_count;</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <a class="code hl_typedef" href="types_8h.html#afaa62991928fb9fb18ff0db62a040aba">u32</a> read_waiter_count;</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <a class="code hl_typedef" href="types_8h.html#afaa62991928fb9fb18ff0db62a040aba">u32</a> write_lock_count;</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> <a class="code hl_typedef" href="types_8h.html#afaa62991928fb9fb18ff0db62a040aba">u32</a> write_waiter_count;</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span> <a class="code hl_typedef" href="types_8h.html#afaa62991928fb9fb18ff0db62a040aba">u32</a> write_owner_tag;</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span>} <a class="code hl_struct" href="structRwLock.html">RwLock</a>;</div>
</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment"></span> </div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">/**</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment"> * @brief Initializes the read/write lock.</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment"> */</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="rwlock_8h.html#aefbfc9e21aa88c421ca09d0c1cacaf91"> 27</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="rwlock_8h.html#aefbfc9e21aa88c421ca09d0c1cacaf91">rwlockInit</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment"></span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment">/**</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment"> * @brief Locks the read/write lock for reading.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment"> */</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"><a class="line" href="rwlock_8h.html#af4686bff28dba24ce1b9aa552109f740"> 33</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="rwlock_8h.html#af4686bff28dba24ce1b9aa552109f740">rwlockReadLock</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment"></span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="comment">/**</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="comment"> * @brief Attempts to lock the read/write lock for reading without waiting.</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment"> * @return 1 if the mutex has been acquired successfully, and 0 on contention.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment"> */</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="rwlock_8h.html#a4a743ae934e413693e20a2e38ec0569d"> 40</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="rwlock_8h.html#a4a743ae934e413693e20a2e38ec0569d">rwlockTryReadLock</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment"></span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">/**</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment"> * @brief Unlocks the read/write lock for reading.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment"> */</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"><a class="line" href="rwlock_8h.html#aaedf3ac67e4ff6bd8407d530ce6579bb"> 46</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="rwlock_8h.html#aaedf3ac67e4ff6bd8407d530ce6579bb">rwlockReadUnlock</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment"></span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">/**</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment"> * @brief Locks the read/write lock for writing.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment"> */</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"><a class="line" href="rwlock_8h.html#a8d4224ba82b14a7df4f102e9c4d3f36a"> 52</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="rwlock_8h.html#a8d4224ba82b14a7df4f102e9c4d3f36a">rwlockWriteLock</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment"></span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">/**</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment"> * @brief Attempts to lock the read/write lock for writing without waiting.</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment"> * @return 1 if the mutex has been acquired successfully, and 0 on contention.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment"> */</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="rwlock_8h.html#a1e947b119ba2e6a120f37d79a605baf0"> 59</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="rwlock_8h.html#a1e947b119ba2e6a120f37d79a605baf0">rwlockTryWriteLock</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment"></span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">/**</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment"> * @brief Unlocks the read/write lock for writing.</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment"> */</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"><a class="line" href="rwlock_8h.html#a14f75537e3015e7031cdac05914da56e"> 65</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="rwlock_8h.html#a14f75537e3015e7031cdac05914da56e">rwlockWriteUnlock</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment"></span> </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">/**</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment"> * @brief Checks if the write lock is held by the current thread.</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment"> * @return 1 if the current hold holds the write lock, and 0 if it does not.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment"> */</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"><a class="line" href="rwlock_8h.html#ae187bd2b121b65d1c4b7c94ec8f925a5"> 72</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="rwlock_8h.html#ae187bd2b121b65d1c4b7c94ec8f925a5">rwlockIsWriteLockHeldByCurrentThread</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment"></span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">/**</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment"> * @brief Checks if the read/write lock is owned by the current thread.</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment"> * @param r Read/write lock object.</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment"> * @return 1 if the current hold holds the write lock or if it holds read locks acquired</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment"> * while it held the write lock, and 0 if it does not.</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment"> */</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"><a class="line" href="rwlock_8h.html#a657d397c411d02fe8eeef33fe37245f4"> 80</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="rwlock_8h.html#a657d397c411d02fe8eeef33fe37245f4">rwlockIsOwnedByCurrentThread</a>(<a class="code hl_struct" href="structRwLock.html">RwLock</a>* r);</div>
<div class="ttc" id="acondvar_8h_html_aae8dd0591cb6fe4a1077118947220f55"><div class="ttname"><a href="condvar_8h.html#aae8dd0591cb6fe4a1077118947220f55">CondVar</a></div><div class="ttdeci">u32 CondVar</div><div class="ttdoc">Condition variable.</div><div class="ttdef"><b>Definition</b> condvar.h:13</div></div>
<div class="ttc" id="amutex_8h_html_a2d649c880d4330dc891cda67837eb897"><div class="ttname"><a href="mutex_8h.html#a2d649c880d4330dc891cda67837eb897">Mutex</a></div><div class="ttdeci">_LOCK_T Mutex</div><div class="ttdoc">Mutex datatype, defined in newlib.</div><div class="ttdef"><b>Definition</b> mutex.h:12</div></div>
<div class="ttc" id="arwlock_8h_html_a14f75537e3015e7031cdac05914da56e"><div class="ttname"><a href="rwlock_8h.html#a14f75537e3015e7031cdac05914da56e">rwlockWriteUnlock</a></div><div class="ttdeci">void rwlockWriteUnlock(RwLock *r)</div><div class="ttdoc">Unlocks the read/write lock for writing.</div></div>
<div class="ttc" id="arwlock_8h_html_a1e947b119ba2e6a120f37d79a605baf0"><div class="ttname"><a href="rwlock_8h.html#a1e947b119ba2e6a120f37d79a605baf0">rwlockTryWriteLock</a></div><div class="ttdeci">bool rwlockTryWriteLock(RwLock *r)</div><div class="ttdoc">Attempts to lock the read/write lock for writing without waiting.</div></div>
<div class="ttc" id="arwlock_8h_html_a4a743ae934e413693e20a2e38ec0569d"><div class="ttname"><a href="rwlock_8h.html#a4a743ae934e413693e20a2e38ec0569d">rwlockTryReadLock</a></div><div class="ttdeci">bool rwlockTryReadLock(RwLock *r)</div><div class="ttdoc">Attempts to lock the read/write lock for reading without waiting.</div></div>
<div class="ttc" id="arwlock_8h_html_a657d397c411d02fe8eeef33fe37245f4"><div class="ttname"><a href="rwlock_8h.html#a657d397c411d02fe8eeef33fe37245f4">rwlockIsOwnedByCurrentThread</a></div><div class="ttdeci">bool rwlockIsOwnedByCurrentThread(RwLock *r)</div><div class="ttdoc">Checks if the read/write lock is owned by the current thread.</div></div>
<div class="ttc" id="arwlock_8h_html_a8d4224ba82b14a7df4f102e9c4d3f36a"><div class="ttname"><a href="rwlock_8h.html#a8d4224ba82b14a7df4f102e9c4d3f36a">rwlockWriteLock</a></div><div class="ttdeci">void rwlockWriteLock(RwLock *r)</div><div class="ttdoc">Locks the read/write lock for writing.</div></div>
<div class="ttc" id="arwlock_8h_html_aaedf3ac67e4ff6bd8407d530ce6579bb"><div class="ttname"><a href="rwlock_8h.html#aaedf3ac67e4ff6bd8407d530ce6579bb">rwlockReadUnlock</a></div><div class="ttdeci">void rwlockReadUnlock(RwLock *r)</div><div class="ttdoc">Unlocks the read/write lock for reading.</div></div>
<div class="ttc" id="arwlock_8h_html_ae187bd2b121b65d1c4b7c94ec8f925a5"><div class="ttname"><a href="rwlock_8h.html#ae187bd2b121b65d1c4b7c94ec8f925a5">rwlockIsWriteLockHeldByCurrentThread</a></div><div class="ttdeci">bool rwlockIsWriteLockHeldByCurrentThread(RwLock *r)</div><div class="ttdoc">Checks if the write lock is held by the current thread.</div></div>
<div class="ttc" id="arwlock_8h_html_aefbfc9e21aa88c421ca09d0c1cacaf91"><div class="ttname"><a href="rwlock_8h.html#aefbfc9e21aa88c421ca09d0c1cacaf91">rwlockInit</a></div><div class="ttdeci">void rwlockInit(RwLock *r)</div><div class="ttdoc">Initializes the read/write lock.</div></div>
<div class="ttc" id="arwlock_8h_html_af4686bff28dba24ce1b9aa552109f740"><div class="ttname"><a href="rwlock_8h.html#af4686bff28dba24ce1b9aa552109f740">rwlockReadLock</a></div><div class="ttdeci">void rwlockReadLock(RwLock *r)</div><div class="ttdoc">Locks the read/write lock for reading.</div></div>
<div class="ttc" id="astructRwLock_html"><div class="ttname"><a href="structRwLock.html">RwLock</a></div><div class="ttdoc">Read/write lock structure.</div><div class="ttdef"><b>Definition</b> rwlock.h:12</div></div>
<div class="ttc" id="atypes_8h_html_afaa62991928fb9fb18ff0db62a040aba"><div class="ttname"><a href="types_8h.html#afaa62991928fb9fb18ff0db62a040aba">u32</a></div><div class="ttdeci">uint32_t u32</div><div class="ttdoc">32-bit unsigned integer.</div><div class="ttdef"><b>Definition</b> types.h:21</div></div>
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