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<h1>thread/dispatcher.cc</h1>A <a class="el" href="classGlib_1_1Dispatcher.html" title="Signal class for inter-thread communication.">Glib::Dispatcher</a> example.<p>
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Glib::Dispatcher example -- cross thread signalling</span>
<a name="l00003"></a>00003 <span class="comment"> * by Daniel Elstner <daniel.kitta@gmail.com></span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * modified to only use glibmm</span>
<a name="l00006"></a>00006 <span class="comment"> * by J. Abelardo Gutierrez <jabelardo@cantv.net></span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * Copyright (c) 2002-2003 Free Software Foundation</span>
<a name="l00009"></a>00009 <span class="comment"> */</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="preprocessor">#include <glibmm.h></span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="preprocessor">#include <<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/algorithm.html">algorithm</a>></span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/functional.html">functional</a>></span>
<a name="l00015"></a>00015 <span class="preprocessor">#include <<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/iostream.html">iostream</a>></span>
<a name="l00016"></a>00016 <span class="preprocessor">#include <<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/vector.html">vector</a>></span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="keyword">namespace</span>
<a name="l00019"></a>00019 {
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">/*</span>
<a name="l00022"></a>00022 <span class="comment"> * Note that it does not make sense for this class to inherit from</span>
<a name="l00023"></a>00023 <span class="comment"> * sigc::trackable, as doing so would only give a false sense of security.</span>
<a name="l00024"></a>00024 <span class="comment"> * Once the thread launch has been triggered, the object has to stay alive</span>
<a name="l00025"></a>00025 <span class="comment"> * until the thread has been joined again. The code running in the thread</span>
<a name="l00026"></a>00026 <span class="comment"> * assumes the existence of the object. If it is destroyed earlier, the</span>
<a name="l00027"></a>00027 <span class="comment"> * program will crash, with sigc::trackable or without it.</span>
<a name="l00028"></a>00028 <span class="comment"> */</span>
<a name="l00029"></a>00029 <span class="keyword">class </span>ThreadProgress
<a name="l00030"></a>00030 {
<a name="l00031"></a>00031 <span class="keyword">public</span>:
<a name="l00032"></a>00032 <span class="keyword">explicit</span> ThreadProgress(<span class="keywordtype">int</span> <span class="keywordtype">id</span>);
<a name="l00033"></a>00033 <span class="keyword">virtual</span> ~ThreadProgress();
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="keywordtype">int</span> id() <span class="keyword">const</span>;
<a name="l00036"></a>00036 <span class="keywordtype">void</span> launch();
<a name="l00037"></a>00037 <span class="keywordtype">void</span> join();
<a name="l00038"></a>00038 <span class="keywordtype">bool</span> unfinished() <span class="keyword">const</span>;
<a name="l00039"></a>00039
<a name="l00040"></a>00040 sigc::signal<void>& signal_finished();
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keyword">private</span>:
<a name="l00043"></a>00043 <span class="keyword">enum</span> { ITERATIONS = 100 };
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">// Note that the thread does not write to the member data at all. It only</span>
<a name="l00046"></a>00046 <span class="comment">// reads signal_increment_, which is only written to before the thread is</span>
<a name="l00047"></a>00047 <span class="comment">// lauched. Therefore, no locking is required.</span>
<a name="l00048"></a>00048 <a name="_a0"></a><a class="code" href="classGlib_1_1Thread.html" title="Represents a running thread.">Glib::Thread</a>* thread_;
<a name="l00049"></a>00049 <span class="keywordtype">int</span> id_;
<a name="l00050"></a>00050 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> progress_;
<a name="l00051"></a>00051 <a name="_a1"></a><a class="code" href="classGlib_1_1Dispatcher.html" title="Signal class for inter-thread communication.">Glib::Dispatcher</a> signal_increment_;
<a name="l00052"></a>00052 sigc::signal<void> signal_finished_;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keywordtype">void</span> progress_increment();
<a name="l00055"></a>00055 <span class="keywordtype">void</span> thread_function();
<a name="l00056"></a>00056 };
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keyword">class </span>Application : <span class="keyword">public</span> sigc::<a name="_a2"></a><a class="code" href="classsigc_1_1trackable.html">trackable</a>
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 <span class="keyword">public</span>:
<a name="l00061"></a>00061 Application();
<a name="l00062"></a>00062 <span class="keyword">virtual</span> ~Application();
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keywordtype">void</span> run();
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="keyword">private</span>:
<a name="l00067"></a>00067 <a name="_a3"></a><a class="code" href="classGlib_1_1RefPtr.html" title="RefPtr&lt;&gt; is a reference-counting shared smartpointer.">Glib::RefPtr<Glib::MainLoop></a> main_loop_;
<a name="l00068"></a>00068 <a name="_a4"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/classstd_1_1vector.html">std::vector<ThreadProgress*></a> progress_threads_;
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keywordtype">void</span> launch_threads();
<a name="l00071"></a>00071 <span class="keywordtype">void</span> on_progress_finished(ThreadProgress* thread_progress);
<a name="l00072"></a>00072 };
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="keyword">template</span> <<span class="keyword">class</span> T>
<a name="l00075"></a>00075 <span class="keyword">class </span>DeletePtr : <span class="keyword">public</span> std::unary_function<void, T>
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 <span class="keyword">public</span>:
<a name="l00078"></a>00078 <span class="keywordtype">void</span> <a class="code" href="bind__iterate_8h.html#a0">operator()</a>(T ptr)<span class="keyword"> const </span>{ <span class="keyword">delete</span> ptr; }
<a name="l00079"></a>00079 };
<a name="l00080"></a>00080
<a name="l00081"></a>00081 ThreadProgress::ThreadProgress(<span class="keywordtype">int</span> <span class="keywordtype">id</span>)
<a name="l00082"></a>00082 :
<a name="l00083"></a>00083 thread_ (0),
<a name="l00084"></a>00084 id_ (<span class="keywordtype">id</span>),
<a name="l00085"></a>00085 progress_ (0)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 <span class="comment">// Connect to the cross-thread signal.</span>
<a name="l00088"></a>00088 signal_increment_.connect(<a name="a5"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/group__s20__3__8__memadaptors.html#gga2">sigc::mem_fun</a>(*<span class="keyword">this</span>, &ThreadProgress::progress_increment));
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090
<a name="l00091"></a>00091 ThreadProgress::~ThreadProgress()
<a name="l00092"></a>00092 {
<a name="l00093"></a>00093 <span class="comment">// It is an error if the thread is still running at this point.</span>
<a name="l00094"></a>00094 g_return_if_fail(thread_ == 0);
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="keywordtype">int</span> ThreadProgress::id()<span class="keyword"> const</span>
<a name="l00098"></a>00098 <span class="keyword"></span>{
<a name="l00099"></a>00099 <span class="keywordflow">return</span> id_;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="keywordtype">void</span> ThreadProgress::launch()
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 <span class="comment">// Create a joinable thread.</span>
<a name="l00105"></a>00105 thread_ = <a name="a6"></a><a class="code" href="classGlib_1_1Thread.html#b165854ff2fc9b454ee4d97050485782" title="Creates a new thread with the priority THREAD_PRIORITY_NORMAL.">Glib::Thread::create</a>(<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/group__s20__3__8__memadaptors.html#gga2">sigc::mem_fun</a>(*<span class="keyword">this</span>, &ThreadProgress::thread_function), <span class="keyword">true</span>);
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="keywordtype">void</span> ThreadProgress::join()
<a name="l00109"></a>00109 {
<a name="l00110"></a>00110 thread_->join();
<a name="l00111"></a>00111 thread_ = 0;
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="keywordtype">bool</span> ThreadProgress::unfinished()<span class="keyword"> const</span>
<a name="l00115"></a>00115 <span class="keyword"></span>{
<a name="l00116"></a>00116 <span class="keywordflow">return</span> (progress_ < ITERATIONS);
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a>00119 sigc::signal<void>& ThreadProgress::signal_finished()
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121 <span class="keywordflow">return</span> signal_finished_;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="keywordtype">void</span> ThreadProgress::progress_increment()
<a name="l00125"></a>00125 {
<a name="l00126"></a>00126 ++progress_;
<a name="l00127"></a>00127 <a name="a7"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a81">std::cout</a> << <span class="stringliteral">"Thread "</span> << id_ << <span class="stringliteral">": "</span> << progress_ << <span class="charliteral">'%'</span> << <a name="a8"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a688">std::endl</a>;
<a name="l00128"></a>00128
<a name="l00129"></a>00129 <span class="keywordflow">if</span> (progress_ >= ITERATIONS)
<a name="l00130"></a>00130 signal_finished_();
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="keywordtype">void</span> ThreadProgress::thread_function()
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135 <a name="_a9"></a><a class="code" href="classGlib_1_1Rand.html">Glib::Rand</a> rand;
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < ITERATIONS; ++i)
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <a name="a10"></a><a class="code" href="namespaceGlib.html#5d75264c8b47f13fb33f973b0d4fc73e">Glib::usleep</a>(rand.<a name="a11"></a><a class="code" href="classGlib_1_1Rand.html#182b9a36db153d316baf5efb1ece9fd7">get_int_range</a>(2000, 20000));
<a name="l00140"></a>00140
<a name="l00141"></a>00141 <span class="comment">// Tell the main thread to increment the progress value.</span>
<a name="l00142"></a>00142 signal_increment_();
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145
<a name="l00146"></a>00146 Application::Application()
<a name="l00147"></a>00147 :
<a name="l00148"></a>00148 main_loop_ (<a name="a12"></a><a class="code" href="classGlib_1_1MainLoop.html#37a1dcf3cb167cf02260111f533d0b5b">Glib::MainLoop::create</a>()),
<a name="l00149"></a>00149 progress_threads_ (5)
<a name="l00150"></a>00150 {
<a name="l00151"></a>00151 <span class="comment">// Note that unless you're targetting an embedded platform, you can assume</span>
<a name="l00152"></a>00152 <span class="comment">// exceptions to be enabled. The #ifdef is only here to make the example</span>
<a name="l00153"></a>00153 <span class="comment">// compile in either case; you may ignore it otherwise.</span>
<a name="l00154"></a>00154 <span class="preprocessor">#ifdef GLIBMM_EXCEPTIONS_ENABLED</span>
<a name="l00155"></a>00155 <span class="preprocessor"></span> <span class="keywordflow">try</span>
<a name="l00156"></a>00156 <span class="preprocessor">#endif</span>
<a name="l00157"></a>00157 <span class="preprocessor"></span> {
<a name="l00158"></a>00158 <span class="keywordflow">for</span> (<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/classstd_1_1vector.html">std::vector<ThreadProgress*>::size_type</a> i = 0; i < progress_threads_.size(); ++i)
<a name="l00159"></a>00159 {
<a name="l00160"></a>00160 ThreadProgress *<span class="keyword">const</span> progress = <span class="keyword">new</span> ThreadProgress(i + 1);
<a name="l00161"></a>00161 progress_threads_[i] = progress;
<a name="l00162"></a>00162
<a name="l00163"></a>00163 progress->signal_finished().connect(
<a name="l00164"></a>00164 sigc::bind<1>(<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/group__s20__3__8__memadaptors.html#gga2">sigc::mem_fun</a>(*<span class="keyword">this</span>, &Application::on_progress_finished), progress));
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167 <span class="preprocessor">#ifdef GLIBMM_EXCEPTIONS_ENABLED</span>
<a name="l00168"></a>00168 <span class="preprocessor"></span> <span class="keywordflow">catch</span> (...)
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 <span class="comment">// In your own code, you should preferably use a smart pointer</span>
<a name="l00171"></a>00171 <span class="comment">// to ensure exception safety.</span>
<a name="l00172"></a>00172 <a name="a13"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a232">std::for_each</a>(progress_threads_.begin(), progress_threads_.end(),
<a name="l00173"></a>00173 DeletePtr<ThreadProgress*>());
<a name="l00174"></a>00174 <span class="keywordflow">throw</span>;
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176 <span class="preprocessor">#endif</span>
<a name="l00177"></a>00177 <span class="preprocessor"></span>}
<a name="l00178"></a>00178
<a name="l00179"></a>00179 Application::~Application()
<a name="l00180"></a>00180 {
<a name="l00181"></a>00181 <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a232">std::for_each</a>(progress_threads_.begin(), progress_threads_.end(),
<a name="l00182"></a>00182 DeletePtr<ThreadProgress*>());
<a name="l00183"></a>00183 }
<a name="l00184"></a>00184
<a name="l00185"></a>00185 <span class="keywordtype">void</span> Application::run()
<a name="l00186"></a>00186 {
<a name="l00187"></a>00187 <span class="comment">// Install a one-shot idle handler to launch the threads.</span>
<a name="l00188"></a>00188 <a name="a14"></a><a class="code" href="group__MainLoop.html#g76792522d9680a05e232d3519a25f98d" title="Convenience idle signal.">Glib::signal_idle</a>().connect(
<a name="l00189"></a>00189 sigc::bind_return(<a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/group__s20__3__8__memadaptors.html#gga2">sigc::mem_fun</a>(*<span class="keyword">this</span>, &Application::launch_threads), <span class="keyword">false</span>));
<a name="l00190"></a>00190
<a name="l00191"></a>00191 main_loop_->run();
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="keywordtype">void</span> Application::launch_threads()
<a name="l00195"></a>00195 {
<a name="l00196"></a>00196 <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a81">std::cout</a> << <span class="stringliteral">"Launching "</span> << progress_threads_.size() << <span class="stringliteral">" threads:"</span> << <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a688">std::endl</a>;
<a name="l00197"></a>00197
<a name="l00198"></a>00198 <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a232">std::for_each</a>(progress_threads_.begin(), progress_threads_.end(),
<a name="l00199"></a>00199 <a name="a15"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/group__s20__3__8__memadaptors.html#ga2">std::mem_fun</a>(&ThreadProgress::launch));
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="keywordtype">void</span> Application::on_progress_finished(ThreadProgress* thread_progress)
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204 thread_progress->join();
<a name="l00205"></a>00205
<a name="l00206"></a>00206 <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a81">std::cout</a> << <span class="stringliteral">"Thread "</span> << thread_progress->id() << <span class="stringliteral">": finished."</span> << <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a688">std::endl</a>;
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="comment">// Quit if it was the last thread to be joined.</span>
<a name="l00209"></a>00209 <span class="keywordflow">if</span> (<a name="a16"></a><a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/namespacestd.html#a238">std::find_if</a>(progress_threads_.begin(), progress_threads_.end(),
<a name="l00210"></a>00210 <a class="codeRef" doxygen="libstdc++.tag.xml:http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/" href="http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/group__s20__3__8__memadaptors.html#ga2">std::mem_fun</a>(&ThreadProgress::unfinished)) == progress_threads_.end())
<a name="l00211"></a>00211 {
<a name="l00212"></a>00212 main_loop_->quit();
<a name="l00213"></a>00213 }
<a name="l00214"></a>00214 }
<a name="l00215"></a>00215
<a name="l00216"></a>00216 } <span class="comment">// anonymous namespace</span>
<a name="l00217"></a>00217
<a name="l00218"></a>00218 <span class="keywordtype">int</span> main(<span class="keywordtype">int</span>, <span class="keywordtype">char</span>**)
<a name="l00219"></a>00219 {
<a name="l00220"></a>00220 <a name="a17"></a><a class="code" href="group__Threads.html#gb26d01c776801f1fff00753e97af4fc7" title="Initializes the GLib thread system.">Glib::thread_init</a>();
<a name="l00221"></a>00221
<a name="l00222"></a>00222 Application application;
<a name="l00223"></a>00223 application.run();
<a name="l00224"></a>00224
<a name="l00225"></a>00225 <span class="keywordflow">return</span> 0;
<a name="l00226"></a>00226 }
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