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<div class="title">thread/thread.cc</div> </div>
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<p>A glibmm thread example.</p>
<div class="fragment"><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00059.html">condition_variable</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00086.html">iostream</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00107.html">memory</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00110.html">mutex</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00119.html">queue</a>></span></div><div class="line"><span class="preprocessor">#include <<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a00158.html">thread</a>></span></div><div class="line"><span class="preprocessor">#if defined(_MSC_VER) && (_MSC_VER < 1900)</span></div><div class="line"><span class="comment">/* For using noexcept on Visual Studio 2013 */</span></div><div class="line"><span class="preprocessor">#include <glibmmconfig.h></span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"><span class="preprocessor">#include <glibmm/init.h></span></div><div class="line"><span class="preprocessor">#include <glibmm/random.h></span></div><div class="line"><span class="preprocessor">#include <glibmm/timer.h></span></div><div class="line"></div><div class="line"><span class="keyword">namespace</span></div><div class="line">{</div><div class="line"></div><div class="line"><span class="keyword">class </span>MessageQueue</div><div class="line">{</div><div class="line"><span class="keyword">public</span>:</div><div class="line"> MessageQueue();</div><div class="line"> ~MessageQueue();</div><div class="line"></div><div class="line"> <span class="keywordtype">void</span> producer();</div><div class="line"> <span class="keywordtype">void</span> consumer();</div><div class="line"></div><div class="line"><span class="keyword">private</span>:</div><div class="line"> <a name="_a0"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a06240.html">std::mutex</a> mutex_;</div><div class="line"> <a name="_a1"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02056.html">std::condition_variable</a> cond_push_;</div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02056.html">std::condition_variable</a> cond_pop_;</div><div class="line"> <a name="_a2"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a06760.html">std::queue<int></a> queue_;</div><div class="line">};</div><div class="line"></div><div class="line">MessageQueue::MessageQueue()</div><div class="line">{</div><div class="line">}</div><div class="line"></div><div class="line">MessageQueue::~MessageQueue()</div><div class="line">{</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span></div><div class="line">MessageQueue::producer()</div><div class="line">{</div><div class="line"> <a name="_a3"></a><a class="code" href="classGlib_1_1Rand.html">Glib::Rand</a> rand(1234);</div><div class="line"></div><div class="line"> <span class="keywordflow">for</span> (<span class="keyword">auto</span> i = 0; i < 200; ++i)</div><div class="line"> {</div><div class="line"> {</div><div class="line"> <a name="_a4"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a06260.html">std::unique_lock<std::mutex></a> <a name="a5"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#a82fa606b1427f731ac64bb8ac49221f3">lock</a>(mutex_);</div><div class="line"></div><div class="line"> cond_pop_.wait(lock, [<span class="keyword">this</span>]() -> <span class="keywordtype">bool</span> { <span class="keywordflow">return</span> queue_.size() < 64; });</div><div class="line"></div><div class="line"> queue_.push(i);</div><div class="line"> <a name="a6"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << <span class="charliteral">'*'</span>;</div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a>.<a name="a7"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02576.html#ab5155ad385b78192ef1436bf31a0cde0">flush</a>();</div><div class="line"></div><div class="line"> <span class="comment">// We unlock before notifying, because that is what the documentation suggests:</span></div><div class="line"> <span class="comment">// http://en.cppreference.com/w/cpp/thread/condition_variable</span></div><div class="line"> lock.unlock();</div><div class="line"> cond_push_.notify_one();</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (rand.<a name="a8"></a><a class="code" href="classGlib_1_1Rand.html#a4d90f1e3ef59d0b071efa0445b6fb469">get_bool</a>())</div><div class="line"> <span class="keywordflow">continue</span>;</div><div class="line"></div><div class="line"> <a name="a9"></a><a class="code" href="namespaceGlib.html#a5d75264c8b47f13fb33f973b0d4fc73e">Glib::usleep</a>(rand.<a name="a10"></a><a class="code" href="classGlib_1_1Rand.html#a182b9a36db153d316baf5efb1ece9fd7">get_int_range</a>(0, 100000));</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">void</span></div><div class="line">MessageQueue::consumer()</div><div class="line">{</div><div class="line"> <a class="code" href="classGlib_1_1Rand.html">Glib::Rand</a> rand(4567);</div><div class="line"></div><div class="line"> <span class="keywordflow">for</span> (;;)</div><div class="line"> {</div><div class="line"> {</div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a06260.html">std::unique_lock<std::mutex></a> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#a82fa606b1427f731ac64bb8ac49221f3">lock</a>(mutex_);</div><div class="line"></div><div class="line"> cond_push_.wait(lock, [<span class="keyword">this</span>]() -> <span class="keywordtype">bool</span> { <span class="keywordflow">return</span> !queue_.empty(); });</div><div class="line"></div><div class="line"> <span class="keyword">const</span> <span class="keywordtype">int</span> i = queue_.front();</div><div class="line"> queue_.pop();</div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << <span class="stringliteral">"\x08 \x08"</span>;</div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a>.<a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02576.html#ab5155ad385b78192ef1436bf31a0cde0">flush</a>();</div><div class="line"></div><div class="line"> <span class="comment">// We unlock before notifying, because that is what the documentation suggests:</span></div><div class="line"> <span class="comment">// http://en.cppreference.com/w/cpp/thread/condition_variable</span></div><div class="line"> lock.unlock();</div><div class="line"> cond_pop_.notify_one();</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (i >= 199)</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (rand.<a class="code" href="classGlib_1_1Rand.html#a4d90f1e3ef59d0b071efa0445b6fb469">get_bool</a>())</div><div class="line"> <span class="keywordflow">continue</span>;</div><div class="line"></div><div class="line"> <a class="code" href="namespaceGlib.html#a5d75264c8b47f13fb33f973b0d4fc73e">Glib::usleep</a>(rand.<a class="code" href="classGlib_1_1Rand.html#a182b9a36db153d316baf5efb1ece9fd7">get_int_range</a>(10000, 200000));</div><div class="line"> }</div><div class="line">}</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span></div><div class="line">main(<span class="keywordtype">int</span>, <span class="keywordtype">char</span>**)</div><div class="line">{</div><div class="line"> <a name="a11"></a><a class="code" href="namespaceGlib.html#ac90aee10d0b90e3d8a96a86b5394f87b">Glib::init</a>();</div><div class="line"></div><div class="line"> MessageQueue queue;</div><div class="line"></div><div class="line"> <span class="comment">// TODO: Use std::make_unique() when we use C++14:</span></div><div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> producer =</div><div class="line"> <a name="_a12"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a06956.html">std::unique_ptr<std::thread></a>(<span class="keyword">new</span> <a name="_a13"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02972.html">std::thread</a>(&MessageQueue::producer, &queue));</div><div class="line"></div><div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> consumer =</div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a06956.html">std::unique_ptr<std::thread></a>(<span class="keyword">new</span> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a02972.html">std::thread</a>(&MessageQueue::consumer, &queue));</div><div class="line"></div><div class="line"> producer->join();</div><div class="line"> consumer->join();</div><div class="line"></div><div class="line"> <a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#aaf93fdf0812752e0e02c501dea1b38f0">std::cout</a> << <a name="a14"></a><a class="codeRef" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01544.html#a8b3758bb8f17c440c7963363f42f69f3">std::endl</a>;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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