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<div class="title">threadpool.cc</div> </div>
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<a href="threadpool_8cc.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">// Copyright 2010-2018 Google LLC</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// You may obtain a copy of the License at</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// See the License for the specific language governing permissions and</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// limitations under the License.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "<a class="code" href="threadpool_8h.html">ortools/base/threadpool.h</a>"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "<a class="code" href="base_2logging_8h.html">ortools/base/logging.h</a>"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="namespaceoperations__research.html#a08b84c3f7aa7f7488210416a1a6530f9"> 19</a></span> <span class="keywordtype">void</span> <a class="code" href="namespaceoperations__research.html#a08b84c3f7aa7f7488210416a1a6530f9">RunWorker</a>(<span class="keywordtype">void</span>* data) {</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <a class="code" href="classoperations__research_1_1ThreadPool.html">ThreadPool</a>* <span class="keyword">const</span> thread_pool = <span class="keyword">reinterpret_cast<</span><a class="code" href="classoperations__research_1_1ThreadPool.html">ThreadPool</a>*<span class="keyword">></span>(data);</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  std::function<void()> work = thread_pool-><a class="code" href="classoperations__research_1_1ThreadPool.html#a574a58759834205c815d601debc67636">GetNextTask</a>();</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">while</span> (work != NULL) {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  work();</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  work = thread_pool-><a class="code" href="classoperations__research_1_1ThreadPool.html#a574a58759834205c815d601debc67636">GetNextTask</a>();</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  }</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> }</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classoperations__research_1_1ThreadPool.html#a0c44e22f9dfc275e181be84bf4e66523"> 28</a></span> <a class="code" href="classoperations__research_1_1ThreadPool.html#a0c44e22f9dfc275e181be84bf4e66523">ThreadPool::ThreadPool</a>(<span class="keyword">const</span> std::string& prefix, <span class="keywordtype">int</span> num_workers)</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  : num_workers_(num_workers) {}</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
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<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="classoperations__research_1_1ThreadPool.html#ad41a30b11a0c9d8566ca1a53b4cf43f6"> 31</a></span> <a class="code" href="classoperations__research_1_1ThreadPool.html#ad41a30b11a0c9d8566ca1a53b4cf43f6">ThreadPool::~ThreadPool</a>() {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">if</span> (started_) {</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  std::unique_lock<std::mutex> mutex_lock(mutex_);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  waiting_to_finish_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  mutex_lock.unlock();</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  condition_.notify_all();</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < num_workers_; ++i) {</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  all_workers_[i].join();</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  }</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  }</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
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<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="classoperations__research_1_1ThreadPool.html#a427fdcf2864e6a3bccc87dcb2d9eaeff"> 43</a></span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1ThreadPool.html#a427fdcf2864e6a3bccc87dcb2d9eaeff">ThreadPool::SetQueueCapacity</a>(<span class="keywordtype">int</span> <a class="code" href="routing__flow_8cc.html#adf3be22c64f10c0783c0cf277e857adf">capacity</a>) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  CHECK_GT(<a class="code" href="routing__flow_8cc.html#adf3be22c64f10c0783c0cf277e857adf">capacity</a>, num_workers_);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  CHECK(!started_);</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  queue_capacity_ = <a class="code" href="routing__flow_8cc.html#adf3be22c64f10c0783c0cf277e857adf">capacity</a>;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> }</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
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<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="classoperations__research_1_1ThreadPool.html#a176534e56452aa8789f0d4200975dc70"> 49</a></span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1ThreadPool.html#a176534e56452aa8789f0d4200975dc70">ThreadPool::StartWorkers</a>() {</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  started_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < num_workers_; ++i) {</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  all_workers_.push_back(std::thread(&<a class="code" href="namespaceoperations__research.html#a08b84c3f7aa7f7488210416a1a6530f9">RunWorker</a>, <span class="keyword">this</span>));</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
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<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="classoperations__research_1_1ThreadPool.html#a574a58759834205c815d601debc67636"> 56</a></span> std::function<void()> <a class="code" href="classoperations__research_1_1ThreadPool.html#a574a58759834205c815d601debc67636">ThreadPool::GetNextTask</a>() {</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  std::unique_lock<std::mutex> lock(mutex_);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">for</span> (;;) {</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span> (!tasks_.empty()) {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  std::function<void()> task = tasks_.front();</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  tasks_.pop_front();</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (tasks_.size() < queue_capacity_ && waiting_for_capacity_) {</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  waiting_for_capacity_ = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  capacity_condition_.notify_all();</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">return</span> task;</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (waiting_to_finish_) {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  condition_.wait(lock);</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> }</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  </div>
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<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="classoperations__research_1_1ThreadPool.html#aac78d8770b03a18532d00104cd2bce0e"> 77</a></span> <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1ThreadPool.html#aac78d8770b03a18532d00104cd2bce0e">ThreadPool::Schedule</a>(std::function<<span class="keywordtype">void</span>()> closure) {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  std::unique_lock<std::mutex> lock(mutex_);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">while</span> (tasks_.size() >= queue_capacity_) {</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  waiting_for_capacity_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  capacity_condition_.wait(lock);</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  tasks_.push_back(closure);</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span> (started_) {</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  lock.unlock();</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  condition_.notify_all();</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> } <span class="comment">// namespace operations_research</span></div>
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</div><!-- fragment --></div><!-- contents -->
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</div><!-- doc-content -->
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html_ad41a30b11a0c9d8566ca1a53b4cf43f6"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html#ad41a30b11a0c9d8566ca1a53b4cf43f6">operations_research::ThreadPool::~ThreadPool</a></div><div class="ttdeci">~ThreadPool()</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00031">threadpool.cc:31</a></div></div>
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<div class="ttc" id="athreadpool_8h_html"><div class="ttname"><a href="threadpool_8h.html">threadpool.h</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html_aac78d8770b03a18532d00104cd2bce0e"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html#aac78d8770b03a18532d00104cd2bce0e">operations_research::ThreadPool::Schedule</a></div><div class="ttdeci">void Schedule(std::function< void()> closure)</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00077">threadpool.cc:77</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html">operations_research::ThreadPool</a></div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8h_source.html#l00026">threadpool.h:26</a></div></div>
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<div class="ttc" id="abase_2logging_8h_html"><div class="ttname"><a href="base_2logging_8h.html">logging.h</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_html"><div class="ttname"><a href="namespaceoperations__research.html">operations_research</a></div><div class="ttdoc">The vehicle routing library lets one model and solve generic vehicle routing problems ranging from th...</div><div class="ttdef"><b>Definition:</b> <a href="dense__doubly__linked__list_8h_source.html#l00021">dense_doubly_linked_list.h:21</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html_a0c44e22f9dfc275e181be84bf4e66523"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html#a0c44e22f9dfc275e181be84bf4e66523">operations_research::ThreadPool::ThreadPool</a></div><div class="ttdeci">ThreadPool(const std::string &prefix, int num_threads)</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00028">threadpool.cc:28</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html_a176534e56452aa8789f0d4200975dc70"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html#a176534e56452aa8789f0d4200975dc70">operations_research::ThreadPool::StartWorkers</a></div><div class="ttdeci">void StartWorkers()</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00049">threadpool.cc:49</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_html_a08b84c3f7aa7f7488210416a1a6530f9"><div class="ttname"><a href="namespaceoperations__research.html#a08b84c3f7aa7f7488210416a1a6530f9">operations_research::RunWorker</a></div><div class="ttdeci">void RunWorker(void *data)</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00019">threadpool.cc:19</a></div></div>
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<div class="ttc" id="arouting__flow_8cc_html_adf3be22c64f10c0783c0cf277e857adf"><div class="ttname"><a href="routing__flow_8cc.html#adf3be22c64f10c0783c0cf277e857adf">capacity</a></div><div class="ttdeci">int64 capacity</div><div class="ttdef"><b>Definition:</b> <a href="routing__flow_8cc_source.html#l00129">routing_flow.cc:129</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html_a427fdcf2864e6a3bccc87dcb2d9eaeff"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html#a427fdcf2864e6a3bccc87dcb2d9eaeff">operations_research::ThreadPool::SetQueueCapacity</a></div><div class="ttdeci">void SetQueueCapacity(int capacity)</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00043">threadpool.cc:43</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1ThreadPool_html_a574a58759834205c815d601debc67636"><div class="ttname"><a href="classoperations__research_1_1ThreadPool.html#a574a58759834205c815d601debc67636">operations_research::ThreadPool::GetNextTask</a></div><div class="ttdeci">std::function< void()> GetNextTask()</div><div class="ttdef"><b>Definition:</b> <a href="threadpool_8cc_source.html#l00056">threadpool.cc:56</a></div></div>
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