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 113 <div class="header">
 114   <div class="headertitle">
 115 <div class="title">Semaphore.h</div>  </div>
 116 </div><!--header-->
 117 <div class="contents">
 118 <a href="_semaphore_8h.xhtml">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
 119 <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) 2017 ARM Limited.</span></div>
 120 <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div>
 121 <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * SPDX-License-Identifier: MIT</span></div>
 122 <div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *</span></div>
 123 <div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span></div>
 124 <div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * of this software and associated documentation files (the &quot;Software&quot;), to</span></div>
 125 <div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * deal in the Software without restriction, including without limitation the</span></div>
 126 <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or</span></div>
 127 <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * sell copies of the Software, and to permit persons to whom the Software is</span></div>
 128 <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * furnished to do so, subject to the following conditions:</span></div>
 129 <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> *</span></div>
 130 <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * The above copyright notice and this permission notice shall be included in all</span></div>
 131 <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * copies or substantial portions of the Software.</span></div>
 132 <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> *</span></div>
 133 <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
 134 <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
 135 <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
 136 <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
 137 <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div>
 138 <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span></div>
 139 <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> * SOFTWARE.</span></div>
 140 <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> */</span></div>
 141 <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#ifndef __ARM_COMPUTE_UTILS_SEMAMPHORE_H__</span></div>
 142 <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define __ARM_COMPUTE_UTILS_SEMAMPHORE_H__</span></div>
 143 <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor"></span></div>
 144 <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="_mutex_8h.xhtml">Mutex.h</a>&quot;</span></div>
 145 <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="_mutex_8h.xhtml">support/Mutex.h</a>&quot;</span></div>
 146 <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="preprocessor">#include &lt;condition_variable&gt;</span></div>
 147 <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div>
 148 <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="keyword">namespace </span>arm_compute</div>
 149 <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;{</div>
 150 <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#ifndef NO_MULTI_THREADING</span></div>
 151 <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor"></span></div>
 152 <div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classarm__compute_1_1_semaphore.xhtml">   35</a></span>&#160;<span class="keyword">class </span><a class="code" href="classarm__compute_1_1_semaphore.xhtml">Semaphore</a></div>
 153 <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;{</div>
 154 <div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="keyword">public</span>:</div>
 155 <div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classarm__compute_1_1_semaphore.xhtml#a5d450aa70997a73d56a0400cee4e539d">   42</a></span>&#160;    <a class="code" href="classarm__compute_1_1_semaphore.xhtml#a5d450aa70997a73d56a0400cee4e539d">Semaphore</a>(<span class="keywordtype">int</span> <a class="code" href="hwc_8hpp.xhtml#a0f61d63b009d0880a89c843bd50d8d76">value</a> = 0)</div>
 156 <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        : _value(<a class="code" href="hwc_8hpp.xhtml#a0f61d63b009d0880a89c843bd50d8d76">value</a>), _m(), _cv()</div>
 157 <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    {</div>
 158 <div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    }</div>
 159 <div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="classarm__compute_1_1_semaphore.xhtml#a2a0f4bfac2f24aa0a07de86141381aec">   47</a></span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classarm__compute_1_1_semaphore.xhtml#a2a0f4bfac2f24aa0a07de86141381aec">signal</a>()</div>
 160 <div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    {</div>
 161 <div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        std::unique_lock&lt;std::mutex&gt; lock(_m);</div>
 162 <div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        ++_value;</div>
 163 <div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        _cv.notify_one();</div>
 164 <div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    }</div>
 165 <div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="classarm__compute_1_1_semaphore.xhtml#aa3b21853f890838c88d047d6c2786917">   54</a></span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classarm__compute_1_1_semaphore.xhtml#aa3b21853f890838c88d047d6c2786917">wait</a>()</div>
 166 <div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    {</div>
 167 <div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        std::unique_lock&lt;std::mutex&gt; lock(_m);</div>
 168 <div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        _cv.wait(lock, [<span class="keyword">this</span>]()</div>
 169 <div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        {</div>
 170 <div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            <span class="keywordflow">return</span> _value &gt; 0;</div>
 171 <div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        });</div>
 172 <div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        --_value;</div>
 173 <div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    }</div>
 174 <div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div>
 175 <div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="keyword">private</span>:</div>
 176 <div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="keywordtype">int</span>                     _value;</div>
 177 <div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <a class="code" href="namespacearm__compute.xhtml#acded863dbfdd730829d4188d67eefcf0">arm_compute::Mutex</a>      _m;</div>
 178 <div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    std::condition_variable _cv;</div>
 179 <div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;};</div>
 180 <div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="preprocessor">#else  </span><span class="comment">/* NO_MULTI_THREADING */</span><span class="preprocessor"></span></div>
 181 <div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="preprocessor"></span></div>
 182 <div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="keyword">class </span>Semaphore</div>
 183 <div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;{</div>
 184 <div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keyword">public</span>:</div>
 185 <div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <a class="code" href="classarm__compute_1_1_semaphore.xhtml#a5d450aa70997a73d56a0400cee4e539d">Semaphore</a>(<span class="keywordtype">int</span> <a class="code" href="hwc_8hpp.xhtml#a0f61d63b009d0880a89c843bd50d8d76">value</a> = 0)</div>
 186 <div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;        : _value(<a class="code" href="hwc_8hpp.xhtml#a0f61d63b009d0880a89c843bd50d8d76">value</a>)</div>
 187 <div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    {</div>
 188 <div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    }</div>
 189 <div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classarm__compute_1_1_semaphore.xhtml#a2a0f4bfac2f24aa0a07de86141381aec">signal</a>()</div>
 190 <div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    {</div>
 191 <div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    }</div>
 192 <div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classarm__compute_1_1_semaphore.xhtml#aa3b21853f890838c88d047d6c2786917">wait</a>()</div>
 193 <div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    {</div>
 194 <div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    }</div>
 195 <div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;</div>
 196 <div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="keyword">private</span>:</div>
 197 <div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keywordtype">int</span> _value;</div>
 198 <div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;};</div>
 199 <div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* NO_MULTI_THREADING */</span><span class="preprocessor"></span></div>
 200 <div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="preprocessor"></span>} <span class="comment">// arm_compute</span></div>
 201 <div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* __ARM_COMPUTE_UTILS_SEMAMPHORE_H__ */</span><span class="preprocessor"></span></div>
 202 <div class="ttc" id="classarm__compute_1_1_semaphore_xhtml"><div class="ttname"><a href="classarm__compute_1_1_semaphore.xhtml">arm_compute::Semaphore</a></div><div class="ttdoc">Semamphore class. </div><div class="ttdef"><b>Definition:</b> <a href="_semaphore_8h_source.xhtml#l00035">Semaphore.h:35</a></div></div>
 203 <div class="ttc" id="classarm__compute_1_1_semaphore_xhtml_aa3b21853f890838c88d047d6c2786917"><div class="ttname"><a href="classarm__compute_1_1_semaphore.xhtml#aa3b21853f890838c88d047d6c2786917">arm_compute::Semaphore::wait</a></div><div class="ttdeci">void wait()</div><div class="ttdoc">Waits on a semaphore. </div><div class="ttdef"><b>Definition:</b> <a href="_semaphore_8h_source.xhtml#l00054">Semaphore.h:54</a></div></div>
 204 <div class="ttc" id="classarm__compute_1_1_semaphore_xhtml_a5d450aa70997a73d56a0400cee4e539d"><div class="ttname"><a href="classarm__compute_1_1_semaphore.xhtml#a5d450aa70997a73d56a0400cee4e539d">arm_compute::Semaphore::Semaphore</a></div><div class="ttdeci">Semaphore(int value=0)</div><div class="ttdoc">Default Constuctor. </div><div class="ttdef"><b>Definition:</b> <a href="_semaphore_8h_source.xhtml#l00042">Semaphore.h:42</a></div></div>
 205 <div class="ttc" id="_mutex_8h_xhtml"><div class="ttname"><a href="_mutex_8h.xhtml">Mutex.h</a></div></div>
 206 <div class="ttc" id="namespacearm__compute_xhtml_acded863dbfdd730829d4188d67eefcf0"><div class="ttname"><a href="namespacearm__compute.xhtml#acded863dbfdd730829d4188d67eefcf0">arm_compute::Mutex</a></div><div class="ttdeci">std::mutex Mutex</div><div class="ttdef"><b>Definition:</b> <a href="_mutex_8h_source.xhtml#l00032">Mutex.h:32</a></div></div>
 207 <div class="ttc" id="hwc_8hpp_xhtml_a0f61d63b009d0880a89c843bd50d8d76"><div class="ttname"><a href="hwc_8hpp.xhtml#a0f61d63b009d0880a89c843bd50d8d76">value</a></div><div class="ttdeci">void * value</div><div class="ttdef"><b>Definition:</b> <a href="hwc_8hpp_source.xhtml#l00269">hwc.hpp:269</a></div></div>
 208 <div class="ttc" id="classarm__compute_1_1_semaphore_xhtml_a2a0f4bfac2f24aa0a07de86141381aec"><div class="ttname"><a href="classarm__compute_1_1_semaphore.xhtml#a2a0f4bfac2f24aa0a07de86141381aec">arm_compute::Semaphore::signal</a></div><div class="ttdeci">void signal()</div><div class="ttdoc">Signals a semaphore. </div><div class="ttdef"><b>Definition:</b> <a href="_semaphore_8h_source.xhtml#l00047">Semaphore.h:47</a></div></div>
 209 </div><!-- fragment --></div><!-- contents -->
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 213   <ul>
 214     <li class="navelem"><a class="el" href="dir_ab9b6c35b410e86d27de6bef9bc73a27.xhtml">support</a></li><li class="navelem"><a class="el" href="_semaphore_8h.xhtml">Semaphore.h</a></li>
 215     <li class="footer">Generated on Thu Oct 12 2017 14:26:33 for Compute Library by
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