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<div class="title">kresolvermanager.cpp</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- C++ -*-</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2003-2005 Thiago Macieira <thiago.macieira@kdemail.net></span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining</span>
<a name="l00006"></a>00006 <span class="comment"> * a copy of this software and associated documentation files (the</span>
<a name="l00007"></a>00007 <span class="comment"> * "Software"), to deal in the Software without restriction, including</span>
<a name="l00008"></a>00008 <span class="comment"> * without limitation the rights to use, copy, modify, merge, publish,</span>
<a name="l00009"></a>00009 <span class="comment"> * distribute, sublicense, and/or sell copies of the Software, and to</span>
<a name="l00010"></a>00010 <span class="comment"> * permit persons to whom the Software is furnished to do so, subject to</span>
<a name="l00011"></a>00011 <span class="comment"> * the following conditions:</span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> * The above copyright notice and this permission notice shall be included </span>
<a name="l00014"></a>00014 <span class="comment"> * in all copies or substantial portions of the Software.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span>
<a name="l00017"></a>00017 <span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
<a name="l00018"></a>00018 <span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
<a name="l00019"></a>00019 <span class="comment"> * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE</span>
<a name="l00020"></a>00020 <span class="comment"> * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION</span>
<a name="l00021"></a>00021 <span class="comment"> * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
<a name="l00022"></a>00022 <span class="comment"> * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
<a name="l00023"></a>00023 <span class="comment"> */</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#include "config.h"</span>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="preprocessor">#include <sys/types.h></span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <netinet/in.h></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <limits.h></span>
<a name="l00030"></a>00030 <span class="preprocessor">#include <unistd.h></span> <span class="comment">// only needed for pid_t</span>
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="preprocessor">#ifdef HAVE_RES_INIT</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor"># include <sys/stat.h></span>
<a name="l00034"></a>00034 <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00035"></a>00035 <span class="preprocessor"># include <arpa/nameser.h></span>
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037 <span class="preprocessor"># include <time.h></span>
<a name="l00038"></a>00038 <span class="preprocessor"># include <resolv.h></span>
<a name="l00039"></a>00039 <span class="preprocessor">#endif</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span>
<a name="l00041"></a>00041 <span class="preprocessor">#include <qapplication.h></span>
<a name="l00042"></a>00042 <span class="preprocessor">#include <qstring.h></span>
<a name="l00043"></a>00043 <span class="preprocessor">#include <qcstring.h></span>
<a name="l00044"></a>00044 <span class="preprocessor">#include <qptrlist.h></span>
<a name="l00045"></a>00045 <span class="preprocessor">#include <qtimer.h></span>
<a name="l00046"></a>00046 <span class="preprocessor">#include <qmutex.h></span>
<a name="l00047"></a>00047 <span class="preprocessor">#include <qthread.h></span>
<a name="l00048"></a>00048 <span class="preprocessor">#include <qwaitcondition.h></span>
<a name="l00049"></a>00049 <span class="preprocessor">#include <qsemaphore.h></span>
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="preprocessor">#include <kde_file.h></span>
<a name="l00052"></a>00052 <span class="preprocessor">#include <kdebug.h></span>
<a name="l00053"></a>00053 <span class="preprocessor">#include "kresolver.h"</span>
<a name="l00054"></a>00054 <span class="preprocessor">#include "kresolver_p.h"</span>
<a name="l00055"></a>00055 <span class="preprocessor">#include "kresolverworkerbase.h"</span>
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="keyword">namespace </span>KNetwork
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 <span class="keyword">namespace </span>Internal
<a name="l00060"></a>00060 {
<a name="l00061"></a>00061 <span class="keywordtype">void</span> initSrvWorker();
<a name="l00062"></a>00062 <span class="keywordtype">void</span> initStandardWorkers();
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="keyword">using namespace </span>KNetwork;
<a name="l00067"></a>00067 <span class="keyword">using namespace </span>KNetwork::Internal;
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">/*</span>
<a name="l00070"></a>00070 <span class="comment"> * Explanation on how the resolver system works</span>
<a name="l00071"></a>00071 <span class="comment"></span>
<a name="l00072"></a>00072 <span class="comment"> When KResolver::start is called, it calls KResolverManager::enqueue to add</span>
<a name="l00073"></a>00073 <span class="comment"> an entry to the queue. KResolverManager::enqueue will verify the availability</span>
<a name="l00074"></a>00074 <span class="comment"> of a worker thread: if one is available, it will dispatch the request to it.</span>
<a name="l00075"></a>00075 <span class="comment"> If no threads are available, it will then decide whether to launch a thread</span>
<a name="l00076"></a>00076 <span class="comment"> or to queue for the future.</span>
<a name="l00077"></a>00077 <span class="comment"></span>
<a name="l00078"></a>00078 <span class="comment"> (This process is achieved by always queueing the new request, starting a</span>
<a name="l00079"></a>00079 <span class="comment"> new thread if necessary and then notifying of the availability of data</span>
<a name="l00080"></a>00080 <span class="comment"> to all worker threads).</span>
<a name="l00081"></a>00081 <span class="comment"></span>
<a name="l00082"></a>00082 <span class="comment"> * Worker thread</span>
<a name="l00083"></a>00083 <span class="comment"> A new thread, when started, will enter its event loop</span>
<a name="l00084"></a>00084 <span class="comment"> immediately. That is, it'll first try to acquire new data to</span>
<a name="l00085"></a>00085 <span class="comment"> process, which means it will lock and unlock the manager mutex in</span>
<a name="l00086"></a>00086 <span class="comment"> the process.</span>
<a name="l00087"></a>00087 <span class="comment"></span>
<a name="l00088"></a>00088 <span class="comment"> If it finds no new data, it'll wait on the feedWorkers condition</span>
<a name="l00089"></a>00089 <span class="comment"> for a certain maximum time. If that time expires and there's still</span>
<a name="l00090"></a>00090 <span class="comment"> no data, the thread will exit, in order to save system resources.</span>
<a name="l00091"></a>00091 <span class="comment"></span>
<a name="l00092"></a>00092 <span class="comment"> If it finds data, however, it'll set up and call the worker class</span>
<a name="l00093"></a>00093 <span class="comment"> that has been selected by the manager. Once that worker is done,</span>
<a name="l00094"></a>00094 <span class="comment"> the thread releases the data through KResolverManager::releaseData.</span>
<a name="l00095"></a>00095 <span class="comment"></span>
<a name="l00096"></a>00096 <span class="comment"> * Data requesting/releasing</span>
<a name="l00097"></a>00097 <span class="comment"> A worker thread always calls upon functions on the resolver manager</span>
<a name="l00098"></a>00098 <span class="comment"> in order to acquire and release data.</span>
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment"> When data is being requested, the KResolverManager::requestData</span>
<a name="l00101"></a>00101 <span class="comment"> function will look the currentRequests list and return the first</span>
<a name="l00102"></a>00102 <span class="comment"> Queued request it finds, while marking it to be InProgress.</span>
<a name="l00103"></a>00103 <span class="comment"></span>
<a name="l00104"></a>00104 <span class="comment"> When the worker class has returned, the worker thread will release</span>
<a name="l00105"></a>00105 <span class="comment"> that data through the KResolverManager::releaseData function. If the</span>
<a name="l00106"></a>00106 <span class="comment"> worker class has requested no further data (nRequests == 0), the</span>
<a name="l00107"></a>00107 <span class="comment"> request's status is marked to be Done. It'll then look at the</span>
<a name="l00108"></a>00108 <span class="comment"> requestor for that data: if it was requested by another worker,</span>
<a name="l00109"></a>00109 <span class="comment"> it'll decrement the requests count for that one and add the results</span>
<a name="l00110"></a>00110 <span class="comment"> to a list. And, finally, if the requests count for the requestor</span>
<a name="l00111"></a>00111 <span class="comment"> becomes 0, it'll repeat this process for the requestor as well</span>
<a name="l00112"></a>00112 <span class="comment"> (change status to Done, check for a requestor).</span>
<a name="l00113"></a>00113 <span class="comment"> */</span>
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="keyword">namespace</span>
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="comment">/*</span>
<a name="l00119"></a>00119 <span class="comment"> * This class is used to control the access to the</span>
<a name="l00120"></a>00120 <span class="comment"> * system's resolver API.</span>
<a name="l00121"></a>00121 <span class="comment"> *</span>
<a name="l00122"></a>00122 <span class="comment"> * It is necessary to periodically poll /etc/resolv.conf and reload</span>
<a name="l00123"></a>00123 <span class="comment"> * it if any changes are noticed. This class does exactly that.</span>
<a name="l00124"></a>00124 <span class="comment"> *</span>
<a name="l00125"></a>00125 <span class="comment"> * However, there's also the problem of reloading the structure while</span>
<a name="l00126"></a>00126 <span class="comment"> * some threads are in progress. Therefore, we keep a usage reference count.</span>
<a name="l00127"></a>00127 <span class="comment"> */</span>
<a name="l00128"></a>00128 <span class="keyword">class </span>ResInitUsage
<a name="l00129"></a>00129 {
<a name="l00130"></a>00130 <span class="keyword">public</span>:
<a name="l00131"></a>00131
<a name="l00132"></a>00132 <span class="preprocessor">#ifdef HAVE_RES_INIT</span>
<a name="l00133"></a>00133 <span class="preprocessor"></span> time_t mTime;
<a name="l00134"></a>00134 <span class="keywordtype">int</span> useCount;
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="preprocessor"># ifndef RES_INIT_THREADSAFE</span>
<a name="l00137"></a>00137 <span class="preprocessor"></span> <a class="codeRef" href="qwaitcondition.html">QWaitCondition</a> cond;
<a name="l00138"></a>00138 <a class="codeRef" href="qmutex.html">QMutex</a> mutex;
<a name="l00139"></a>00139 <span class="preprocessor"># endif</span>
<a name="l00140"></a>00140 <span class="preprocessor"></span>
<a name="l00141"></a>00141 <span class="keywordtype">bool</span> shouldResInit()
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 <span class="comment">// check if /etc/resolv.conf has changed </span>
<a name="l00144"></a>00144 KDE_struct_stat st;
<a name="l00145"></a>00145 <span class="keywordflow">if</span> (KDE_stat(<span class="stringliteral">"/etc/resolv.conf"</span>, &st) != 0)
<a name="l00146"></a>00146 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="keywordflow">if</span> (mTime != st.st_mtime)
<a name="l00149"></a>00149 {
<a name="l00150"></a>00150 kdDebug(179) << <span class="stringliteral">"shouldResInit: /etc/resolv.conf updated"</span> << <a class="code" href="group__kdebug.html#ga313d520ed8f8f6b46eeef22cfb3b082a" title="Does nothing.">endl</a>;
<a name="l00151"></a>00151 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00154"></a>00154 }
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="keywordtype">void</span> callResInit()
<a name="l00157"></a>00157 {
<a name="l00158"></a>00158 <span class="keywordflow">if</span> (mTime != 0)
<a name="l00159"></a>00159 {
<a name="l00160"></a>00160 <span class="comment">// don't call it the first time</span>
<a name="l00161"></a>00161 <span class="comment">// let it be initialised naturally</span>
<a name="l00162"></a>00162 kdDebug(179) << <span class="stringliteral">"callResInit: calling res_init()"</span> << <a class="code" href="group__kdebug.html#ga313d520ed8f8f6b46eeef22cfb3b082a" title="Does nothing.">endl</a>;
<a name="l00163"></a>00163 res_init();
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166 KDE_struct_stat st;
<a name="l00167"></a>00167 <span class="keywordflow">if</span> (KDE_stat(<span class="stringliteral">"/etc/resolv.conf"</span>, &st) == 0)
<a name="l00168"></a>00168 mTime = st.st_mtime;
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170
<a name="l00171"></a>00171 ResInitUsage()
<a name="l00172"></a>00172 : mTime(0), useCount(0)
<a name="l00173"></a>00173 { }
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="comment">/*</span>
<a name="l00176"></a>00176 <span class="comment"> * Marks the end of usage to the resolver tools</span>
<a name="l00177"></a>00177 <span class="comment"> */</span>
<a name="l00178"></a>00178 <span class="keywordtype">void</span> release()
<a name="l00179"></a>00179 {
<a name="l00180"></a>00180 <span class="preprocessor"># ifndef RES_INIT_THREADSAFE</span>
<a name="l00181"></a>00181 <span class="preprocessor"></span> <a class="codeRef" href="qmutexlocker.html">QMutexLocker</a> locker(&mutex);
<a name="l00182"></a>00182 <span class="keywordflow">if</span> (--useCount == 0)
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184 <span class="keywordflow">if</span> (shouldResInit())
<a name="l00185"></a>00185 callResInit();
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="comment">// we've reached 0, wake up anyone that's waiting to call res_init</span>
<a name="l00188"></a>00188 cond.wakeAll();
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 <span class="preprocessor"># else</span>
<a name="l00191"></a>00191 <span class="preprocessor"></span> <span class="comment">// do nothing</span>
<a name="l00192"></a>00192 <span class="preprocessor"># endif</span>
<a name="l00193"></a>00193 <span class="preprocessor"></span> }
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="comment">/*</span>
<a name="l00196"></a>00196 <span class="comment"> * Marks the beginning of usage of the resolver API</span>
<a name="l00197"></a>00197 <span class="comment"> */</span>
<a name="l00198"></a>00198 <span class="keywordtype">void</span> acquire()
<a name="l00199"></a>00199 {
<a name="l00200"></a>00200 <span class="preprocessor"># ifndef RES_INIT_THREADSAFE</span>
<a name="l00201"></a>00201 <span class="preprocessor"></span> mutex.lock();
<a name="l00202"></a>00202
<a name="l00203"></a>00203 <span class="keywordflow">if</span> (shouldResInit())
<a name="l00204"></a>00204 {
<a name="l00205"></a>00205 <span class="keywordflow">if</span> (useCount)
<a name="l00206"></a>00206 {
<a name="l00207"></a>00207 <span class="comment">// other threads are already using the API, so wait till</span>
<a name="l00208"></a>00208 <span class="comment">// it's all clear</span>
<a name="l00209"></a>00209 <span class="comment">// the thread that emits this condition will also call res_init</span>
<a name="l00210"></a>00210 <span class="comment">//qDebug("ResInitUsage: waiting for libresolv to be clear");</span>
<a name="l00211"></a>00211 cond.wait(&mutex);
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213 <span class="keywordflow">else</span>
<a name="l00214"></a>00214 <span class="comment">// we're clear</span>
<a name="l00215"></a>00215 callResInit();
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217 useCount++;
<a name="l00218"></a>00218 mutex.unlock();
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="preprocessor"># else</span>
<a name="l00221"></a>00221 <span class="preprocessor"></span> <span class="keywordflow">if</span> (shouldResInit())
<a name="l00222"></a>00222 callResInit();
<a name="l00223"></a>00223
<a name="l00224"></a>00224 <span class="preprocessor"># endif</span>
<a name="l00225"></a>00225 <span class="preprocessor"></span> }
<a name="l00226"></a>00226
<a name="l00227"></a>00227 <span class="preprocessor">#else</span>
<a name="l00228"></a>00228 <span class="preprocessor"></span> ResInitUsage()
<a name="l00229"></a>00229 { }
<a name="l00230"></a>00230
<a name="l00231"></a>00231 <span class="keywordtype">bool</span> shouldResInit()
<a name="l00232"></a>00232 { <span class="keywordflow">return</span> <span class="keyword">false</span>; }
<a name="l00233"></a>00233
<a name="l00234"></a>00234 <span class="keywordtype">void</span> acquire()
<a name="l00235"></a>00235 { }
<a name="l00236"></a>00236
<a name="l00237"></a>00237 <span class="keywordtype">void</span> release()
<a name="l00238"></a>00238 { }
<a name="l00239"></a>00239 <span class="preprocessor">#endif</span>
<a name="l00240"></a>00240 <span class="preprocessor"></span>
<a name="l00241"></a>00241 } resInit;
<a name="l00242"></a>00242
<a name="l00243"></a>00243 } <span class="comment">// anonymous namespace</span>
<a name="l00244"></a>00244
<a name="l00245"></a>00245 <span class="comment">/*</span>
<a name="l00246"></a>00246 <span class="comment"> * parameters</span>
<a name="l00247"></a>00247 <span class="comment"> */</span>
<a name="l00248"></a>00248 <span class="comment">// a thread will try maxThreadRetries to get data, waiting at most</span>
<a name="l00249"></a>00249 <span class="comment">// maxThreadWaitTime milliseconds between each attempt. After that, it'll</span>
<a name="l00250"></a>00250 <span class="comment">// exit</span>
<a name="l00251"></a>00251 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> maxThreadWaitTime = 2000; <span class="comment">// 2 seconds</span>
<a name="l00252"></a>00252 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> maxThreads = 5;
<a name="l00253"></a>00253
<a name="l00254"></a>00254 <span class="keyword">static</span> pid_t pid; <span class="comment">// FIXME -- disable when everything is ok</span>
<a name="l00255"></a>00255
<a name="l00256"></a>00256 KResolverThread::KResolverThread()
<a name="l00257"></a>00257 : data(0L)
<a name="l00258"></a>00258 {
<a name="l00259"></a>00259 }
<a name="l00260"></a>00260
<a name="l00261"></a>00261 <span class="comment">// remember! This function runs in a separate thread!</span>
<a name="l00262"></a>00262 <span class="keywordtype">void</span> KResolverThread::run()
<a name="l00263"></a>00263 {
<a name="l00264"></a>00264 <span class="comment">// initialisation</span>
<a name="l00265"></a>00265 <span class="comment">// enter the loop already</span>
<a name="l00266"></a>00266
<a name="l00267"></a>00267 <span class="comment">//qDebug("KResolverThread(thread %u/%p): started", pid, (void*)QThread::currentThread());</span>
<a name="l00268"></a>00268 KResolverManager::manager()->registerThread(<span class="keyword">this</span>);
<a name="l00269"></a>00269 <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00270"></a>00270 {
<a name="l00271"></a>00271 data = KResolverManager::manager()->requestData(<span class="keyword">this</span>, ::maxThreadWaitTime);
<a name="l00272"></a>00272 <span class="comment">//qDebug("KResolverThread(thread %u/%p) got data %p", KResolverManager::pid, </span>
<a name="l00273"></a>00273 <span class="comment">// (void*)QThread::currentThread(), (void*)data);</span>
<a name="l00274"></a>00274 <span class="keywordflow">if</span> (data)
<a name="l00275"></a>00275 {
<a name="l00276"></a>00276 <span class="comment">// yes, we got data</span>
<a name="l00277"></a>00277 <span class="comment">// process it!</span>
<a name="l00278"></a>00278
<a name="l00279"></a>00279 <span class="comment">// 1) set up</span>
<a name="l00280"></a>00280 ;
<a name="l00281"></a>00281
<a name="l00282"></a>00282 <span class="comment">// 2) run it</span>
<a name="l00283"></a>00283 data->worker->run();
<a name="l00284"></a>00284
<a name="l00285"></a>00285 <span class="comment">// 3) release data</span>
<a name="l00286"></a>00286 KResolverManager::manager()->releaseData(<span class="keyword">this</span>, data);
<a name="l00287"></a>00287
<a name="l00288"></a>00288 <span class="comment">// now go back to the loop</span>
<a name="l00289"></a>00289 }
<a name="l00290"></a>00290 <span class="keywordflow">else</span>
<a name="l00291"></a>00291 <span class="keywordflow">break</span>;
<a name="l00292"></a>00292 }
<a name="l00293"></a>00293
<a name="l00294"></a>00294 KResolverManager::manager()->unregisterThread(<span class="keyword">this</span>);
<a name="l00295"></a>00295 <span class="comment">//qDebug("KResolverThread(thread %u/%p): exiting", pid, (void*)QThread::currentThread());</span>
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297
<a name="l00298"></a>00298 <span class="keywordtype">bool</span> KResolverThread::checkResolver()
<a name="l00299"></a>00299 {
<a name="l00300"></a>00300 <span class="keywordflow">return</span> resInit.shouldResInit();
<a name="l00301"></a>00301 }
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="keywordtype">void</span> KResolverThread::acquireResolver()
<a name="l00304"></a>00304 {
<a name="l00305"></a>00305 <span class="preprocessor">#if defined(NEED_MUTEX) && !defined(Q_OS_FREEBSD)</span>
<a name="l00306"></a>00306 <span class="preprocessor"></span> getXXbyYYmutex.lock();
<a name="l00307"></a>00307 <span class="preprocessor">#endif</span>
<a name="l00308"></a>00308 <span class="preprocessor"></span>
<a name="l00309"></a>00309 resInit.acquire();
<a name="l00310"></a>00310 }
<a name="l00311"></a>00311
<a name="l00312"></a>00312 <span class="keywordtype">void</span> KResolverThread::releaseResolver()
<a name="l00313"></a>00313 {
<a name="l00314"></a>00314 <span class="preprocessor">#if defined(NEED_MUTEX) && !defined(Q_OS_FREEBSD)</span>
<a name="l00315"></a>00315 <span class="preprocessor"></span> getXXbyYYmutex.unlock();
<a name="l00316"></a>00316 <span class="preprocessor">#endif</span>
<a name="l00317"></a>00317 <span class="preprocessor"></span>
<a name="l00318"></a>00318 resInit.release();
<a name="l00319"></a>00319 }
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="keyword">static</span> KResolverManager *globalManager;
<a name="l00322"></a>00322
<a name="l00323"></a>00323 KResolverManager* KResolverManager::manager()
<a name="l00324"></a>00324 {
<a name="l00325"></a>00325 <span class="keywordflow">if</span> (globalManager == 0L)
<a name="l00326"></a>00326 <span class="keyword">new</span> KResolverManager();
<a name="l00327"></a>00327 <span class="keywordflow">return</span> globalManager;
<a name="l00328"></a>00328 }
<a name="l00329"></a>00329
<a name="l00330"></a>00330 KResolverManager::KResolverManager()
<a name="l00331"></a>00331 : runningThreads(0), availableThreads(0)
<a name="l00332"></a>00332 {
<a name="l00333"></a>00333 globalManager = <span class="keyword">this</span>;
<a name="l00334"></a>00334 workers.setAutoDelete(<span class="keyword">true</span>);
<a name="l00335"></a>00335 currentRequests.setAutoDelete(<span class="keyword">true</span>);
<a name="l00336"></a>00336 initSrvWorker();
<a name="l00337"></a>00337 initStandardWorkers();
<a name="l00338"></a>00338
<a name="l00339"></a>00339 pid = getpid();
<a name="l00340"></a>00340 }
<a name="l00341"></a>00341
<a name="l00342"></a>00342 KResolverManager::~KResolverManager()
<a name="l00343"></a>00343 {
<a name="l00344"></a>00344 <span class="comment">// this should never be called</span>
<a name="l00345"></a>00345
<a name="l00346"></a>00346 <span class="comment">// kill off running threads</span>
<a name="l00347"></a>00347 <span class="keywordflow">for</span> (workers.first(); workers.current(); workers.next())
<a name="l00348"></a>00348 workers.current()->terminate();
<a name="l00349"></a>00349 }
<a name="l00350"></a>00350
<a name="l00351"></a>00351 <span class="keywordtype">void</span> KResolverManager::registerThread(KResolverThread* )
<a name="l00352"></a>00352 {
<a name="l00353"></a>00353 }
<a name="l00354"></a>00354
<a name="l00355"></a>00355 <span class="keywordtype">void</span> KResolverManager::unregisterThread(KResolverThread*)
<a name="l00356"></a>00356 {
<a name="l00357"></a>00357 runningThreads--;
<a name="l00358"></a>00358 }
<a name="l00359"></a>00359
<a name="l00360"></a>00360 <span class="comment">// this function is called by KResolverThread::run</span>
<a name="l00361"></a>00361 RequestData* KResolverManager::requestData(KResolverThread *th, <span class="keywordtype">int</span> maxWaitTime)
<a name="l00362"></a>00362 {
<a name="l00364"></a>00364 <span class="comment">// This function is called in a worker thread!!</span>
<a name="l00366"></a>00366 <span class="comment"></span>
<a name="l00367"></a>00367 <span class="comment">// lock the mutex, so that the manager thread or other threads won't</span>
<a name="l00368"></a>00368 <span class="comment">// interfere.</span>
<a name="l00369"></a>00369 <a class="codeRef" href="qmutexlocker.html">QMutexLocker</a> locker(&mutex);
<a name="l00370"></a>00370 RequestData *data = findData(th);
<a name="l00371"></a>00371
<a name="l00372"></a>00372 <span class="keywordflow">if</span> (data)
<a name="l00373"></a>00373 <span class="comment">// it found something, that's good</span>
<a name="l00374"></a>00374 <span class="keywordflow">return</span> data;
<a name="l00375"></a>00375
<a name="l00376"></a>00376 <span class="comment">// nope, nothing found; sleep for a while</span>
<a name="l00377"></a>00377 availableThreads++;
<a name="l00378"></a>00378 feedWorkers.wait(&mutex, maxWaitTime);
<a name="l00379"></a>00379 availableThreads--;
<a name="l00380"></a>00380
<a name="l00381"></a>00381 data = findData(th);
<a name="l00382"></a>00382 <span class="keywordflow">return</span> data;
<a name="l00383"></a>00383 }
<a name="l00384"></a>00384
<a name="l00385"></a>00385 RequestData* KResolverManager::findData(KResolverThread* th)
<a name="l00386"></a>00386 {
<a name="l00388"></a>00388 <span class="comment">// This function is called by @ref requestData above and must</span>
<a name="l00389"></a>00389 <span class="comment">// always be called with a locked mutex</span>
<a name="l00391"></a>00391 <span class="comment"></span>
<a name="l00392"></a>00392 <span class="comment">// now find data to be processed</span>
<a name="l00393"></a>00393 <span class="keywordflow">for</span> (RequestData *curr = newRequests.first(); curr; curr = newRequests.next())
<a name="l00394"></a>00394 <span class="keywordflow">if</span> (!curr->worker->m_finished)
<a name="l00395"></a>00395 {
<a name="l00396"></a>00396 <span class="comment">// found one</span>
<a name="l00397"></a>00397 <span class="keywordflow">if</span> (curr->obj)
<a name="l00398"></a>00398 curr->obj->status = KResolver::InProgress;
<a name="l00399"></a>00399 curr->worker->th = th;
<a name="l00400"></a>00400
<a name="l00401"></a>00401 <span class="comment">// move it to the currentRequests list</span>
<a name="l00402"></a>00402 currentRequests.append(newRequests.take());
<a name="l00403"></a>00403
<a name="l00404"></a>00404 <span class="keywordflow">return</span> curr;
<a name="l00405"></a>00405 }
<a name="l00406"></a>00406
<a name="l00407"></a>00407 <span class="comment">// found nothing!</span>
<a name="l00408"></a>00408 <span class="keywordflow">return</span> 0L;
<a name="l00409"></a>00409 }
<a name="l00410"></a>00410
<a name="l00411"></a>00411 <span class="comment">// this function is called by KResolverThread::run</span>
<a name="l00412"></a>00412 <span class="keywordtype">void</span> KResolverManager::releaseData(KResolverThread *, RequestData* data)
<a name="l00413"></a>00413 {
<a name="l00415"></a>00415 <span class="comment">// This function is called in a worker thread!!</span>
<a name="l00417"></a>00417 <span class="comment"></span>
<a name="l00418"></a>00418 <span class="comment">//qDebug("KResolverManager::releaseData(%u/%p): %p has been released", pid, </span>
<a name="l00419"></a>00419 <span class="comment">// (void*)QThread::currentThread(), (void*)data);</span>
<a name="l00420"></a>00420
<a name="l00421"></a>00421 <span class="keywordflow">if</span> (data->obj)
<a name="l00422"></a>00422 {
<a name="l00423"></a>00423 data->obj->status = KResolver::PostProcessing;
<a name="l00424"></a>00424 }
<a name="l00425"></a>00425
<a name="l00426"></a>00426 data->worker->m_finished = <span class="keyword">true</span>;
<a name="l00427"></a>00427 data->worker->th = 0L; <span class="comment">// this releases the object</span>
<a name="l00428"></a>00428
<a name="l00429"></a>00429 <span class="comment">// handle finished requests</span>
<a name="l00430"></a>00430 handleFinished();
<a name="l00431"></a>00431 }
<a name="l00432"></a>00432
<a name="l00433"></a>00433 <span class="comment">// this function is called by KResolverManager::releaseData above</span>
<a name="l00434"></a>00434 <span class="keywordtype">void</span> KResolverManager::handleFinished()
<a name="l00435"></a>00435 {
<a name="l00436"></a>00436 <span class="keywordtype">bool</span> <a class="codeRef" doxygen="kdeui.tag:../../kdeui/html/" href="../../kdeui/html/namespaceKStdAction.html#ab2d0131e47297266537e778087afb7f0">redo</a> = <span class="keyword">false</span>;
<a name="l00437"></a>00437 <a class="codeRef" href="qptrqueue.html">QPtrQueue<RequestData></a> doneRequests;
<a name="l00438"></a>00438
<a name="l00439"></a>00439 mutex.lock();
<a name="l00440"></a>00440
<a name="l00441"></a>00441 <span class="comment">// loop over all items on the currently running list</span>
<a name="l00442"></a>00442 <span class="comment">// we loop from the last to the first so that we catch requests with "requestors" before</span>
<a name="l00443"></a>00443 <span class="comment">// we catch the requestor itself.</span>
<a name="l00444"></a>00444 RequestData *curr = currentRequests.last();
<a name="l00445"></a>00445 <span class="keywordflow">while</span> (curr)
<a name="l00446"></a>00446 {
<a name="l00447"></a>00447 <span class="keywordflow">if</span> (curr->worker->th == 0L)
<a name="l00448"></a>00448 {
<a name="l00449"></a>00449 <span class="keywordflow">if</span> (handleFinishedItem(curr))
<a name="l00450"></a>00450 {
<a name="l00451"></a>00451 doneRequests.<a class="codeRef" href="qptrqueue.html#enqueue">enqueue</a>(currentRequests.take());
<a name="l00452"></a>00452 <span class="keywordflow">if</span> (curr->requestor &&
<a name="l00453"></a>00453 curr->requestor->nRequests == 0 &&
<a name="l00454"></a>00454 curr->requestor->worker->m_finished)
<a name="l00455"></a>00455 <span class="comment">// there's a requestor that is now finished</span>
<a name="l00456"></a>00456 redo = <span class="keyword">true</span>;
<a name="l00457"></a>00457 }
<a name="l00458"></a>00458 }
<a name="l00459"></a>00459
<a name="l00460"></a>00460 curr = currentRequests.prev();
<a name="l00461"></a>00461 }
<a name="l00462"></a>00462
<a name="l00463"></a>00463 <span class="comment">//qDebug("KResolverManager::handleFinished(%u): %d requests to notify", pid, doneRequests.count());</span>
<a name="l00464"></a>00464 <span class="keywordflow">while</span> (RequestData *d = doneRequests.<a class="codeRef" href="qptrqueue.html#dequeue">dequeue</a>())
<a name="l00465"></a>00465 doNotifying(d);
<a name="l00466"></a>00466
<a name="l00467"></a>00467 mutex.unlock();
<a name="l00468"></a>00468
<a name="l00469"></a>00469 <span class="keywordflow">if</span> (redo)
<a name="l00470"></a>00470 {
<a name="l00471"></a>00471 <span class="comment">//qDebug("KResolverManager::handleFinished(%u): restarting processing to catch requestor",</span>
<a name="l00472"></a>00472 <span class="comment">// pid);</span>
<a name="l00473"></a>00473 handleFinished();
<a name="l00474"></a>00474 }
<a name="l00475"></a>00475 }
<a name="l00476"></a>00476
<a name="l00477"></a>00477 <span class="comment">// This function is called by KResolverManager::handleFinished above</span>
<a name="l00478"></a>00478 <span class="keywordtype">bool</span> KResolverManager::handleFinishedItem(RequestData* curr)
<a name="l00479"></a>00479
<a name="l00480"></a>00480 {
<a name="l00481"></a>00481 <span class="comment">// for all items that aren't currently running, remove from the list</span>
<a name="l00482"></a>00482 <span class="comment">// this includes all finished or cancelled requests</span>
<a name="l00483"></a>00483
<a name="l00484"></a>00484 <span class="keywordflow">if</span> (curr->worker->m_finished && curr->nRequests == 0)
<a name="l00485"></a>00485 {
<a name="l00486"></a>00486 <span class="comment">// this one has finished</span>
<a name="l00487"></a>00487 <span class="keywordflow">if</span> (curr->obj)
<a name="l00488"></a>00488 curr->obj->status = KResolver::PostProcessing; <span class="comment">// post-processing is run in doNotifying()</span>
<a name="l00489"></a>00489
<a name="l00490"></a>00490 <span class="keywordflow">if</span> (curr->requestor)
<a name="l00491"></a>00491 --curr->requestor->nRequests;
<a name="l00492"></a>00492
<a name="l00493"></a>00493 <span class="comment">//qDebug("KResolverManager::handleFinishedItem(%u): removing %p since it's done",</span>
<a name="l00494"></a>00494 <span class="comment">// pid, (void*)curr);</span>
<a name="l00495"></a>00495 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00496"></a>00496 }
<a name="l00497"></a>00497 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00498"></a>00498 }
<a name="l00499"></a>00499
<a name="l00500"></a>00500
<a name="l00501"></a>00501
<a name="l00502"></a>00502 <span class="keywordtype">void</span> KResolverManager::registerNewWorker(KResolverWorkerFactoryBase *factory)
<a name="l00503"></a>00503 {
<a name="l00504"></a>00504 workerFactories.append(factory);
<a name="l00505"></a>00505 }
<a name="l00506"></a>00506
<a name="l00507"></a>00507 KResolverWorkerBase* KResolverManager::findWorker(KResolverPrivate* p)
<a name="l00508"></a>00508 {
<a name="l00510"></a>00510 <span class="comment">// this function can be called on any user thread</span>
<a name="l00512"></a>00512 <span class="comment"></span>
<a name="l00513"></a>00513 <span class="comment">// this function is called with an unlocked mutex and it's expected to be </span>
<a name="l00514"></a>00514 <span class="comment">// thread-safe!</span>
<a name="l00515"></a>00515 <span class="comment">// but the factory list is expected not to be changed asynchronously</span>
<a name="l00516"></a>00516
<a name="l00517"></a>00517 <span class="comment">// This function is responsible for finding a suitable worker for the given</span>
<a name="l00518"></a>00518 <span class="comment">// input. That means we have to do a costly operation to create each worker</span>
<a name="l00519"></a>00519 <span class="comment">// class and call their preprocessing functions. The first one that</span>
<a name="l00520"></a>00520 <span class="comment">// says they can process (i.e., preprocess() returns true) will get the job.</span>
<a name="l00521"></a>00521
<a name="l00522"></a>00522 KResolverWorkerBase *worker;
<a name="l00523"></a>00523 <span class="keywordflow">for</span> (KResolverWorkerFactoryBase *factory = workerFactories.first(); factory;
<a name="l00524"></a>00524 factory = workerFactories.next())
<a name="l00525"></a>00525 {
<a name="l00526"></a>00526 worker = factory->create();
<a name="l00527"></a>00527
<a name="l00528"></a>00528 <span class="comment">// set up the data the worker needs to preprocess</span>
<a name="l00529"></a>00529 worker->input = &p->input;
<a name="l00530"></a>00530
<a name="l00531"></a>00531 <span class="keywordflow">if</span> (worker->preprocess())
<a name="l00532"></a>00532 {
<a name="l00533"></a>00533 <span class="comment">// good, this one says it can process</span>
<a name="l00534"></a>00534 <span class="keywordflow">if</span> (worker->m_finished)
<a name="l00535"></a>00535 p->status = KResolver::PostProcessing;
<a name="l00536"></a>00536 <span class="keywordflow">else</span>
<a name="l00537"></a>00537 p->status = KResolver::Queued;
<a name="l00538"></a>00538 <span class="keywordflow">return</span> worker;
<a name="l00539"></a>00539 }
<a name="l00540"></a>00540
<a name="l00541"></a>00541 <span class="comment">// no, try again</span>
<a name="l00542"></a>00542 <span class="keyword">delete</span> worker;
<a name="l00543"></a>00543 }
<a name="l00544"></a>00544
<a name="l00545"></a>00545 <span class="comment">// found no worker</span>
<a name="l00546"></a>00546 <span class="keywordflow">return</span> 0L;
<a name="l00547"></a>00547 }
<a name="l00548"></a>00548
<a name="l00549"></a>00549 <span class="keywordtype">void</span> KResolverManager::doNotifying(RequestData *p)
<a name="l00550"></a>00550 {
<a name="l00552"></a>00552 <span class="comment">// This function may be called on any thread</span>
<a name="l00553"></a>00553 <span class="comment">// any thread at all: user threads, GUI thread, manager thread or worker thread</span>
<a name="l00555"></a>00555 <span class="comment"></span>
<a name="l00556"></a>00556 <span class="comment">// Notification and finalisation</span>
<a name="l00557"></a>00557 <span class="comment">//</span>
<a name="l00558"></a>00558 <span class="comment">// Once a request has finished the normal processing, we call the</span>
<a name="l00559"></a>00559 <span class="comment">// post processing function.</span>
<a name="l00560"></a>00560 <span class="comment">//</span>
<a name="l00561"></a>00561 <span class="comment">// After that is done, we will consolidate all results in the object's</span>
<a name="l00562"></a>00562 <span class="comment">// KResolverResults and then post an event indicating that the signal</span>
<a name="l00563"></a>00563 <span class="comment">// be emitted</span>
<a name="l00564"></a>00564 <span class="comment">//</span>
<a name="l00565"></a>00565 <span class="comment">// In case we detect that the object is waiting for completion, we do not</span>
<a name="l00566"></a>00566 <span class="comment">// post the event, for KResolver::wait will take care of emitting the</span>
<a name="l00567"></a>00567 <span class="comment">// signal.</span>
<a name="l00568"></a>00568 <span class="comment">//</span>
<a name="l00569"></a>00569 <span class="comment">// Once we release the mutex on the object, we may no longer reference it</span>
<a name="l00570"></a>00570 <span class="comment">// for it might have been deleted.</span>
<a name="l00571"></a>00571
<a name="l00572"></a>00572 <span class="comment">// "User" objects are those that are not created by the manager. Note that</span>
<a name="l00573"></a>00573 <span class="comment">// objects created by worker threads are considered "user" objects. Objects</span>
<a name="l00574"></a>00574 <span class="comment">// created by the manager are those created for KResolver::resolveAsync.</span>
<a name="l00575"></a>00575 <span class="comment">// We should delete them.</span>
<a name="l00576"></a>00576
<a name="l00577"></a>00577 <span class="keywordflow">if</span> (p->obj)
<a name="l00578"></a>00578 {
<a name="l00579"></a>00579 <span class="comment">// lock the object</span>
<a name="l00580"></a>00580 p->obj->mutex.lock();
<a name="l00581"></a>00581 <a class="code" href="classKNetwork_1_1KResolver.html" title="Name and service resolution class.">KResolver</a>* parent = p->obj-><a class="codeRef" href="qobject.html#parent">parent</a>; <span class="comment">// is 0 for non-"user" objects</span>
<a name="l00582"></a>00582 <a class="code" href="classKNetwork_1_1KResolverResults.html" title="Name and service resolution results.">KResolverResults</a>& r = p->obj->results;
<a name="l00583"></a>00583
<a name="l00584"></a>00584 <span class="keywordflow">if</span> (p->obj->status == KResolver::Canceled)
<a name="l00585"></a>00585 {
<a name="l00586"></a>00586 p->obj->status = KResolver::Canceled;
<a name="l00587"></a>00587 p->obj->errorcode = KResolver::Canceled;
<a name="l00588"></a>00588 p->obj->syserror = 0;
<a name="l00589"></a>00589 r.<a class="code" href="classKNetwork_1_1KResolverResults.html#ade58b72e86192912c9fddd7882e705e9" title="Sets the error codes.">setError</a>(KResolver::Canceled, 0);
<a name="l00590"></a>00590 }
<a name="l00591"></a>00591 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (p->worker)
<a name="l00592"></a>00592 {
<a name="l00593"></a>00593 <span class="comment">// post processing</span>
<a name="l00594"></a>00594 p->worker->postprocess(); <span class="comment">// ignore the result</span>
<a name="l00595"></a>00595
<a name="l00596"></a>00596 <span class="comment">// copy the results from the worker thread to the final</span>
<a name="l00597"></a>00597 <span class="comment">// object</span>
<a name="l00598"></a>00598 r = p->worker->results;
<a name="l00599"></a>00599
<a name="l00600"></a>00600 <span class="comment">// reset address</span>
<a name="l00601"></a>00601 r.<a class="code" href="classKNetwork_1_1KResolverResults.html#a2cee4d36b36e81ffed8016071e79af3f" title="Sets the new nodename and service name.">setAddress</a>(p->input->node, p->input->service);
<a name="l00602"></a>00602
<a name="l00603"></a>00603 <span class="comment">//qDebug("KResolverManager::doNotifying(%u/%p): for %p whose status is %d and has %d results", </span>
<a name="l00604"></a>00604 <span class="comment">//pid, (void*)QThread::currentThread(), (void*)p, p->obj->status, r.count());</span>
<a name="l00605"></a>00605
<a name="l00606"></a>00606 p->obj->errorcode = r.<a class="code" href="classKNetwork_1_1KResolverResults.html#a066d3aa848ba40df7fe39db09b2515ef" title="Retrieves the error code associated with this resolution.">error</a>();
<a name="l00607"></a>00607 p->obj->syserror = r.<a class="code" href="classKNetwork_1_1KResolverResults.html#ac2d9a67b03227205143fdb0cdb369726" title="Retrieves the system error code, if any.">systemError</a>();
<a name="l00608"></a>00608 p->obj->status = !r.<a class="codeRef" href="qvaluelist.html#isEmpty">isEmpty</a>() ?
<a name="l00609"></a>00609 KResolver::Success : KResolver::Failed;
<a name="l00610"></a>00610 }
<a name="l00611"></a>00611 <span class="keywordflow">else</span>
<a name="l00612"></a>00612 {
<a name="l00613"></a>00613 r.<a class="codeRef" href="qvaluelist.html#empty">empty</a>();
<a name="l00614"></a>00614 r.<a class="code" href="classKNetwork_1_1KResolverResults.html#ade58b72e86192912c9fddd7882e705e9" title="Sets the error codes.">setError</a>(p->obj->errorcode, p->obj->syserror);
<a name="l00615"></a>00615 }
<a name="l00616"></a>00616
<a name="l00617"></a>00617 <span class="comment">// check whether there's someone waiting</span>
<a name="l00618"></a>00618 <span class="keywordflow">if</span> (!p->obj->waiting && parent)
<a name="l00619"></a>00619 <span class="comment">// no, so we must post an event requesting that the signal be emitted</span>
<a name="l00620"></a>00620 <span class="comment">// sorry for the C-style cast, but neither static nor reintepret cast work</span>
<a name="l00621"></a>00621 <span class="comment">// here; I'd have to do two casts</span>
<a name="l00622"></a>00622 <a class="codeRef" href="qapplication.html#postEvent">QApplication::postEvent</a>(parent, <span class="keyword">new</span> <a class="codeRef" href="qevent.html">QEvent</a>((QEvent::Type)(ResolutionCompleted)));
<a name="l00623"></a>00623
<a name="l00624"></a>00624 <span class="comment">// release the mutex</span>
<a name="l00625"></a>00625 p->obj->mutex.unlock();
<a name="l00626"></a>00626 }
<a name="l00627"></a>00627 <span class="keywordflow">else</span>
<a name="l00628"></a>00628 {
<a name="l00629"></a>00629 <span class="comment">// there's no object!</span>
<a name="l00630"></a>00630 <span class="keywordflow">if</span> (p->worker)
<a name="l00631"></a>00631 p->worker->postprocess();
<a name="l00632"></a>00632 }
<a name="l00633"></a>00633
<a name="l00634"></a>00634 <span class="keyword">delete</span> p->worker;
<a name="l00635"></a>00635
<a name="l00636"></a>00636 <span class="comment">// ignore p->requestor and p->nRequests</span>
<a name="l00637"></a>00637 <span class="comment">// they have been dealt with by the main loop</span>
<a name="l00638"></a>00638
<a name="l00639"></a>00639 <span class="keyword">delete</span> p;
<a name="l00640"></a>00640
<a name="l00641"></a>00641 <span class="comment">// notify any objects waiting in KResolver::wait</span>
<a name="l00642"></a>00642 notifyWaiters.wakeAll();
<a name="l00643"></a>00643 }
<a name="l00644"></a>00644
<a name="l00645"></a>00645 <span class="comment">// enqueue a new request</span>
<a name="l00646"></a>00646 <span class="comment">// this function is called from KResolver::start and </span>
<a name="l00647"></a>00647 <span class="comment">// from KResolverWorkerBase::enqueue</span>
<a name="l00648"></a>00648 <span class="keywordtype">void</span> KResolverManager::enqueue(<a class="code" href="classKNetwork_1_1KResolver.html" title="Name and service resolution class.">KResolver</a> *obj, RequestData *requestor)
<a name="l00649"></a>00649 {
<a name="l00650"></a>00650 RequestData *newrequest = <span class="keyword">new</span> RequestData;
<a name="l00651"></a>00651 newrequest->nRequests = 0;
<a name="l00652"></a>00652 newrequest->obj = obj->d;
<a name="l00653"></a>00653 newrequest->input = &obj->d->input;
<a name="l00654"></a>00654 newrequest->requestor = requestor;
<a name="l00655"></a>00655
<a name="l00656"></a>00656 <span class="comment">// when processing a new request, find the most</span>
<a name="l00657"></a>00657 <span class="comment">// suitable worker</span>
<a name="l00658"></a>00658 <span class="keywordflow">if</span> ((newrequest->worker = findWorker(obj->d)) == 0L)
<a name="l00659"></a>00659 {
<a name="l00660"></a>00660 <span class="comment">// oops, problem</span>
<a name="l00661"></a>00661 <span class="comment">// cannot find a worker class for this guy</span>
<a name="l00662"></a>00662 obj->d->status = KResolver::Failed;
<a name="l00663"></a>00663 obj->d->errorcode = KResolver::UnsupportedFamily;
<a name="l00664"></a>00664 obj->d->syserror = 0;
<a name="l00665"></a>00665
<a name="l00666"></a>00666 doNotifying(newrequest);
<a name="l00667"></a>00667 <span class="keywordflow">return</span>;
<a name="l00668"></a>00668 }
<a name="l00669"></a>00669
<a name="l00670"></a>00670 <span class="comment">// no, queue it</span>
<a name="l00671"></a>00671 <span class="comment">// p->status was set in findWorker!</span>
<a name="l00672"></a>00672 <span class="keywordflow">if</span> (requestor)
<a name="l00673"></a>00673 requestor->nRequests++;
<a name="l00674"></a>00674
<a name="l00675"></a>00675 <span class="keywordflow">if</span> (!newrequest->worker->m_finished)
<a name="l00676"></a>00676 dispatch(newrequest);
<a name="l00677"></a>00677 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (newrequest->nRequests > 0)
<a name="l00678"></a>00678 {
<a name="l00679"></a>00679 mutex.lock();
<a name="l00680"></a>00680 currentRequests.append(newrequest);
<a name="l00681"></a>00681 mutex.unlock();
<a name="l00682"></a>00682 }
<a name="l00683"></a>00683 <span class="keywordflow">else</span>
<a name="l00684"></a>00684 <span class="comment">// already done</span>
<a name="l00685"></a>00685 doNotifying(newrequest);
<a name="l00686"></a>00686 }
<a name="l00687"></a>00687
<a name="l00688"></a>00688 <span class="comment">// a new request has been created</span>
<a name="l00689"></a>00689 <span class="comment">// dispatch it</span>
<a name="l00690"></a>00690 <span class="keywordtype">void</span> KResolverManager::dispatch(RequestData *data)
<a name="l00691"></a>00691 {
<a name="l00692"></a>00692 <span class="comment">// As stated in the beginning of the file, this function</span>
<a name="l00693"></a>00693 <span class="comment">// is supposed to verify the availability of threads, start</span>
<a name="l00694"></a>00694 <span class="comment">// any if necessary</span>
<a name="l00695"></a>00695
<a name="l00696"></a>00696 <a class="codeRef" href="qmutexlocker.html">QMutexLocker</a> locker(&mutex);
<a name="l00697"></a>00697
<a name="l00698"></a>00698 <span class="comment">// add to the queue</span>
<a name="l00699"></a>00699 newRequests.append(data);
<a name="l00700"></a>00700
<a name="l00701"></a>00701 <span class="comment">// check if we need to start a new thread</span>
<a name="l00702"></a>00702 <span class="comment">//</span>
<a name="l00703"></a>00703 <span class="comment">// we depend on the variables availableThreads and runningThreads to</span>
<a name="l00704"></a>00704 <span class="comment">// know if we are supposed to start any threads:</span>
<a name="l00705"></a>00705 <span class="comment">// - if availableThreads > 0, then there is at least one thread waiting,</span>
<a name="l00706"></a>00706 <span class="comment">// blocked in KResolverManager::requestData. It can't unblock</span>
<a name="l00707"></a>00707 <span class="comment">// while we are holding the mutex locked, therefore we are sure that</span>
<a name="l00708"></a>00708 <span class="comment">// our event will be handled</span>
<a name="l00709"></a>00709 <span class="comment">// - if availableThreads == 0:</span>
<a name="l00710"></a>00710 <span class="comment">// - if runningThreads < maxThreads</span>
<a name="l00711"></a>00711 <span class="comment">// we will start a new thread, which will certainly block in</span>
<a name="l00712"></a>00712 <span class="comment">// KResolverManager::requestData because we are holding the mutex locked</span>
<a name="l00713"></a>00713 <span class="comment">// - if runningThreads == maxThreads</span>
<a name="l00714"></a>00714 <span class="comment">// This situation generally means that we have already maxThreads running</span>
<a name="l00715"></a>00715 <span class="comment">// and that all of them are processing. We will not start any new threads,</span>
<a name="l00716"></a>00716 <span class="comment">// but will instead wait for one to finish processing and request new data</span>
<a name="l00717"></a>00717 <span class="comment">//</span>
<a name="l00718"></a>00718 <span class="comment">// There's a possible race condition here, which goes unhandled: if one of</span>
<a name="l00719"></a>00719 <span class="comment">// threads has timed out waiting for new data and is in the process of</span>
<a name="l00720"></a>00720 <span class="comment">// exiting. In that case, availableThreads == 0 and runningThreads will not</span>
<a name="l00721"></a>00721 <span class="comment">// have decremented yet. This means that we will not start a new thread</span>
<a name="l00722"></a>00722 <span class="comment">// that we could have. However, since there are other threads working, our</span>
<a name="l00723"></a>00723 <span class="comment">// event should be handled soon.</span>
<a name="l00724"></a>00724 <span class="comment">// It won't be handled if and only if ALL threads are in the process of </span>
<a name="l00725"></a>00725 <span class="comment">// exiting. That situation is EXTREMELY unlikely and is not handled either.</span>
<a name="l00726"></a>00726 <span class="comment">//</span>
<a name="l00727"></a>00727 <span class="keywordflow">if</span> (availableThreads == 0 && runningThreads < maxThreads)
<a name="l00728"></a>00728 {
<a name="l00729"></a>00729 <span class="comment">// yes, a new thread should be started</span>
<a name="l00730"></a>00730
<a name="l00731"></a>00731 <span class="comment">// find if there's a finished one</span>
<a name="l00732"></a>00732 KResolverThread *th = workers.first();
<a name="l00733"></a>00733 <span class="keywordflow">while</span> (th && th->running())
<a name="l00734"></a>00734 th = workers.next();
<a name="l00735"></a>00735
<a name="l00736"></a>00736 <span class="keywordflow">if</span> (th == 0L)
<a name="l00737"></a>00737 <span class="comment">// no, create one</span>
<a name="l00738"></a>00738 th = <span class="keyword">new</span> KResolverThread;
<a name="l00739"></a>00739 <span class="keywordflow">else</span>
<a name="l00740"></a>00740 workers.take();
<a name="l00741"></a>00741
<a name="l00742"></a>00742 th->start();
<a name="l00743"></a>00743 workers.append(th);
<a name="l00744"></a>00744 runningThreads++;
<a name="l00745"></a>00745 }
<a name="l00746"></a>00746
<a name="l00747"></a>00747 feedWorkers.wakeAll();
<a name="l00748"></a>00748
<a name="l00749"></a>00749 <span class="comment">// clean up idle threads</span>
<a name="l00750"></a>00750 workers.first();
<a name="l00751"></a>00751 <span class="keywordflow">while</span> (workers.current())
<a name="l00752"></a>00752 {
<a name="l00753"></a>00753 <span class="keywordflow">if</span> (!workers.current()->running())
<a name="l00754"></a>00754 workers.remove();
<a name="l00755"></a>00755 <span class="keywordflow">else</span>
<a name="l00756"></a>00756 workers.next();
<a name="l00757"></a>00757 }
<a name="l00758"></a>00758 }
<a name="l00759"></a>00759
<a name="l00760"></a>00760 <span class="comment">// this function is called by KResolverManager::dequeue</span>
<a name="l00761"></a>00761 <span class="keywordtype">bool</span> KResolverManager::dequeueNew(<a class="code" href="classKNetwork_1_1KResolver.html" title="Name and service resolution class.">KResolver</a>* obj)
<a name="l00762"></a>00762 {
<a name="l00763"></a>00763 <span class="comment">// This function must be called with a locked mutex</span>
<a name="l00764"></a>00764 <span class="comment">// Deadlock warning:</span>
<a name="l00765"></a>00765 <span class="comment">// always lock the global mutex first if both mutexes must be locked</span>
<a name="l00766"></a>00766
<a name="l00767"></a>00767 KResolverPrivate *d = obj->d;
<a name="l00768"></a>00768
<a name="l00769"></a>00769 <span class="comment">// check if it's in the new request list</span>
<a name="l00770"></a>00770 RequestData *curr = newRequests.first();
<a name="l00771"></a>00771 <span class="keywordflow">while</span> (curr)
<a name="l00772"></a>00772 <span class="keywordflow">if</span> (curr->obj == d)
<a name="l00773"></a>00773 {
<a name="l00774"></a>00774 <span class="comment">// yes, this object is still in the list</span>
<a name="l00775"></a>00775 <span class="comment">// but it has never been processed</span>
<a name="l00776"></a>00776 d->status = KResolver::Canceled;
<a name="l00777"></a>00777 d->errorcode = KResolver::Canceled;
<a name="l00778"></a>00778 d->syserror = 0;
<a name="l00779"></a>00779 newRequests.take();
<a name="l00780"></a>00780
<a name="l00781"></a>00781 <span class="keyword">delete</span> curr->worker;
<a name="l00782"></a>00782 <span class="keyword">delete</span> curr;
<a name="l00783"></a>00783
<a name="l00784"></a>00784 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00785"></a>00785 }
<a name="l00786"></a>00786 <span class="keywordflow">else</span>
<a name="l00787"></a>00787 curr = newRequests.next();
<a name="l00788"></a>00788
<a name="l00789"></a>00789 <span class="comment">// check if it's running</span>
<a name="l00790"></a>00790 curr = currentRequests.first();
<a name="l00791"></a>00791 <span class="keywordflow">while</span> (curr)
<a name="l00792"></a>00792 <span class="keywordflow">if</span> (curr->obj == d)
<a name="l00793"></a>00793 {
<a name="l00794"></a>00794 <span class="comment">// it's running. We cannot simply take it out of the list.</span>
<a name="l00795"></a>00795 <span class="comment">// it will be handled when the thread that is working on it finishes</span>
<a name="l00796"></a>00796 d->mutex.lock();
<a name="l00797"></a>00797
<a name="l00798"></a>00798 d->status = KResolver::Canceled;
<a name="l00799"></a>00799 d->errorcode = KResolver::Canceled;
<a name="l00800"></a>00800 d->syserror = 0;
<a name="l00801"></a>00801
<a name="l00802"></a>00802 <span class="comment">// disengage from the running threads</span>
<a name="l00803"></a>00803 curr->obj = 0L;
<a name="l00804"></a>00804 curr->input = 0L;
<a name="l00805"></a>00805 <span class="keywordflow">if</span> (curr->worker)
<a name="l00806"></a>00806 curr->worker->input = 0L;
<a name="l00807"></a>00807
<a name="l00808"></a>00808 d->mutex.unlock();
<a name="l00809"></a>00809 }
<a name="l00810"></a>00810 <span class="keywordflow">else</span>
<a name="l00811"></a>00811 curr = currentRequests.next();
<a name="l00812"></a>00812
<a name="l00813"></a>00813 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00814"></a>00814 }
<a name="l00815"></a>00815
<a name="l00816"></a>00816 <span class="comment">// this function is called by KResolver::cancel</span>
<a name="l00817"></a>00817 <span class="comment">// it's expected to be thread-safe</span>
<a name="l00818"></a>00818 <span class="keywordtype">void</span> KResolverManager::dequeue(<a class="code" href="classKNetwork_1_1KResolver.html" title="Name and service resolution class.">KResolver</a> *obj)
<a name="l00819"></a>00819 {
<a name="l00820"></a>00820 <a class="codeRef" href="qmutexlocker.html">QMutexLocker</a> locker(&mutex);
<a name="l00821"></a>00821 dequeueNew(obj);
<a name="l00822"></a>00822 }
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