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<h1>JackPosixSemaphore.cpp</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">Copyright (C) 2004-2008 Grame</span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment">This program is free software; you can redistribute it and/or modify</span>
<a name="l00005"></a>00005 <span class="comment">it under the terms of the GNU Lesser General Public License as published by</span>
<a name="l00006"></a>00006 <span class="comment">the Free Software Foundation; either version 2.1 of the License, or</span>
<a name="l00007"></a>00007 <span class="comment">(at your option) any later version.</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment">This program is distributed in the hope that it will be useful,</span>
<a name="l00010"></a>00010 <span class="comment">but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00011"></a>00011 <span class="comment">MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00012"></a>00012 <span class="comment">GNU Lesser General Public License for more details.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">You should have received a copy of the GNU Lesser General Public License</span>
<a name="l00015"></a>00015 <span class="comment">along with this program; if not, write to the Free Software</span>
<a name="l00016"></a>00016 <span class="comment">Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</span>
<a name="l00017"></a>00017 <span class="comment"></span>
<a name="l00018"></a>00018 <span class="comment">*/</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#include "JackPosixSemaphore.h"</span>
<a name="l00021"></a>00021 <span class="preprocessor">#include "JackTools.h"</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include "JackConstants.h"</span>
<a name="l00023"></a>00023 <span class="preprocessor">#include "JackError.h"</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <fcntl.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <stdio.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <sys/time.h></span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="keyword">namespace </span>Jack
<a name="l00029"></a>00029 {
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="keywordtype">void</span> JackPosixSemaphore::BuildName(<span class="keyword">const</span> <span class="keywordtype">char</span>* client_name, <span class="keyword">const</span> <span class="keywordtype">char</span>* server_name, <span class="keywordtype">char</span>* res)
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033 <span class="keywordtype">char</span> ext_client_name[JACK_CLIENT_NAME_SIZE + 1];
<a name="l00034"></a>00034 JackTools::RewriteName(client_name, ext_client_name);
<a name="l00035"></a>00035 sprintf(res, <span class="stringliteral">"jack_sem.%d_%s_%s"</span>, JackTools::GetUID(), server_name, ext_client_name);
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keywordtype">bool</span> JackPosixSemaphore::Signal()
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 <span class="keywordtype">int</span> res;
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keywordflow">if</span> (!fSemaphore) {
<a name="l00043"></a>00043 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::Signal name = %s already desallocated!!"</span>, fName);
<a name="l00044"></a>00044 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00045"></a>00045 }
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="keywordflow">if</span> (fFlush)
<a name="l00048"></a>00048 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordflow">if</span> ((res = sem_post(fSemaphore)) != 0) {
<a name="l00051"></a>00051 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::Signal name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053 <span class="keywordflow">return</span> (res == 0);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="keywordtype">bool</span> JackPosixSemaphore::SignalAll()
<a name="l00057"></a>00057 {
<a name="l00058"></a>00058 <span class="keywordtype">int</span> res;
<a name="l00059"></a>00059
<a name="l00060"></a>00060 <span class="keywordflow">if</span> (!fSemaphore) {
<a name="l00061"></a>00061 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::SignalAll name = %s already desallocated!!"</span>, fName);
<a name="l00062"></a>00062 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keywordflow">if</span> (fFlush)
<a name="l00066"></a>00066 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keywordflow">if</span> ((res = sem_post(fSemaphore)) != 0) {
<a name="l00069"></a>00069 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::SignalAll name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071 <span class="keywordflow">return</span> (res == 0);
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="comment">/*</span>
<a name="l00075"></a>00075 <span class="comment">bool JackPosixSemaphore::Wait()</span>
<a name="l00076"></a>00076 <span class="comment">{</span>
<a name="l00077"></a>00077 <span class="comment"> int res;</span>
<a name="l00078"></a>00078 <span class="comment"></span>
<a name="l00079"></a>00079 <span class="comment"> if (!fSemaphore) {</span>
<a name="l00080"></a>00080 <span class="comment"> jack_error("JackPosixSemaphore::Wait name = %s already desallocated!!", fName);</span>
<a name="l00081"></a>00081 <span class="comment"> return false;</span>
<a name="l00082"></a>00082 <span class="comment"> }</span>
<a name="l00083"></a>00083 <span class="comment"></span>
<a name="l00084"></a>00084 <span class="comment"> if ((res = sem_wait(fSemaphore)) != 0) {</span>
<a name="l00085"></a>00085 <span class="comment"> jack_error("JackPosixSemaphore::Wait name = %s err = %s", fName, strerror(errno));</span>
<a name="l00086"></a>00086 <span class="comment"> }</span>
<a name="l00087"></a>00087 <span class="comment"> return (res == 0);</span>
<a name="l00088"></a>00088 <span class="comment">}</span>
<a name="l00089"></a>00089 <span class="comment">*/</span>
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keywordtype">bool</span> JackPosixSemaphore::Wait()
<a name="l00092"></a>00092 {
<a name="l00093"></a>00093 <span class="keywordtype">int</span> res;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keywordflow">while</span> ((res = sem_wait(fSemaphore) < 0)) {
<a name="l00096"></a>00096 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::Wait name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00097"></a>00097 <span class="keywordflow">if</span> (errno != EINTR)
<a name="l00098"></a>00098 <span class="keywordflow">break</span>;
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100 <span class="keywordflow">return</span> (res == 0);
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="preprocessor">#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) // glibc feature test</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span>
<a name="l00105"></a>00105 <span class="keywordtype">bool</span> JackPosixSemaphore::TimedWait(<span class="keywordtype">long</span> usec)
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107 <span class="keywordtype">int</span> res;
<a name="l00108"></a>00108 <span class="keyword">struct </span>timeval now;
<a name="l00109"></a>00109 timespec time;
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="keywordflow">if</span> (!fSemaphore) {
<a name="l00112"></a>00112 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::TimedWait name = %s already desallocated!!"</span>, fName);
<a name="l00113"></a>00113 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115 gettimeofday(&now, 0);
<a name="l00116"></a>00116 time.tv_sec = now.tv_sec + usec / 1000000;
<a name="l00117"></a>00117 <span class="keywordtype">long</span> tv_usec = (now.tv_usec + (usec % 1000000));
<a name="l00118"></a>00118 time.tv_sec += tv_usec / 1000000;
<a name="l00119"></a>00119 time.tv_nsec = (tv_usec % 1000000) * 1000;
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="keywordflow">while</span> ((res = sem_timedwait(fSemaphore, &time)) < 0) {
<a name="l00122"></a>00122 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::TimedWait err = %s"</span>, strerror(errno));
<a name="l00123"></a>00123 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"now %ld %ld "</span>, now.tv_sec, now.tv_usec);
<a name="l00124"></a>00124 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"next %ld %ld "</span>, time.tv_sec, time.tv_nsec/1000);
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (errno != EINTR)
<a name="l00126"></a>00126 <span class="keywordflow">break</span>;
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128 <span class="keywordflow">return</span> (res == 0);
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="preprocessor">#else</span>
<a name="l00132"></a>00132 <span class="preprocessor"></span><span class="preprocessor">#warning "JackPosixSemaphore::TimedWait is not supported: Jack in SYNC mode with JackPosixSemaphore will not run properly !!"</span>
<a name="l00133"></a>00133 <span class="preprocessor"></span>
<a name="l00134"></a>00134 <span class="keywordtype">bool</span> JackPosixSemaphore::TimedWait(<span class="keywordtype">long</span> usec)
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136 <span class="keywordflow">return</span> Wait();
<a name="l00137"></a>00137 }
<a name="l00138"></a>00138 <span class="preprocessor">#endif</span>
<a name="l00139"></a>00139 <span class="preprocessor"></span>
<a name="l00140"></a>00140 <span class="comment">// Server side : publish the semaphore in the global namespace</span>
<a name="l00141"></a>00141 <span class="keywordtype">bool</span> JackPosixSemaphore::Allocate(<span class="keyword">const</span> <span class="keywordtype">char</span>* name, <span class="keyword">const</span> <span class="keywordtype">char</span>* server_name, <span class="keywordtype">int</span> value)
<a name="l00142"></a>00142 {
<a name="l00143"></a>00143 BuildName(name, server_name, fName);
<a name="l00144"></a>00144 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackPosixSemaphore::Allocate name = %s val = %ld"</span>, fName, value);
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="keywordflow">if</span> ((fSemaphore = sem_open(fName, O_CREAT, 0777, value)) == (sem_t*)SEM_FAILED) {
<a name="l00147"></a>00147 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Allocate: can't check in named semaphore name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00148"></a>00148 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00149"></a>00149 } <span class="keywordflow">else</span> {
<a name="l00150"></a>00150 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="comment">// Client side : get the published semaphore from server</span>
<a name="l00155"></a>00155 <span class="keywordtype">bool</span> JackPosixSemaphore::ConnectInput(<span class="keyword">const</span> <span class="keywordtype">char</span>* name, <span class="keyword">const</span> <span class="keywordtype">char</span>* server_name)
<a name="l00156"></a>00156 {
<a name="l00157"></a>00157 BuildName(name, server_name, fName);
<a name="l00158"></a>00158 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackPosixSemaphore::Connect %s"</span>, fName);
<a name="l00159"></a>00159
<a name="l00160"></a>00160 <span class="comment">// Temporary...</span>
<a name="l00161"></a>00161 <span class="keywordflow">if</span> (fSemaphore) {
<a name="l00162"></a>00162 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"Already connected name = %s"</span>, name);
<a name="l00163"></a>00163 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166 <span class="keywordflow">if</span> ((fSemaphore = sem_open(fName, O_CREAT)) == (sem_t*)SEM_FAILED) {
<a name="l00167"></a>00167 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Connect: can't connect named semaphore name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00168"></a>00168 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00169"></a>00169 } <span class="keywordflow">else</span> {
<a name="l00170"></a>00170 <span class="keywordtype">int</span> val = 0;
<a name="l00171"></a>00171 sem_getvalue(fSemaphore, &val);
<a name="l00172"></a>00172 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackPosixSemaphore::Connect sem_getvalue %ld"</span>, val);
<a name="l00173"></a>00173 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 }
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="keywordtype">bool</span> JackPosixSemaphore::Connect(<span class="keyword">const</span> <span class="keywordtype">char</span>* name, <span class="keyword">const</span> <span class="keywordtype">char</span>* server_name)
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 <span class="keywordflow">return</span> ConnectInput(name, server_name);
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181
<a name="l00182"></a>00182 <span class="keywordtype">bool</span> JackPosixSemaphore::ConnectOutput(<span class="keyword">const</span> <span class="keywordtype">char</span>* name, <span class="keyword">const</span> <span class="keywordtype">char</span>* server_name)
<a name="l00183"></a>00183 {
<a name="l00184"></a>00184 <span class="keywordflow">return</span> ConnectInput(name, server_name);
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186
<a name="l00187"></a>00187 <span class="keywordtype">bool</span> JackPosixSemaphore::Disconnect()
<a name="l00188"></a>00188 {
<a name="l00189"></a>00189 <span class="keywordflow">if</span> (fSemaphore) {
<a name="l00190"></a>00190 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackPosixSemaphore::Disconnect %s"</span>, fName);
<a name="l00191"></a>00191 <span class="keywordflow">if</span> (sem_close(fSemaphore) != 0) {
<a name="l00192"></a>00192 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Disconnect: can't disconnect named semaphore name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00193"></a>00193 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00194"></a>00194 } <span class="keywordflow">else</span> {
<a name="l00195"></a>00195 fSemaphore = NULL;
<a name="l00196"></a>00196 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198 } <span class="keywordflow">else</span> {
<a name="l00199"></a>00199 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201 }
<a name="l00202"></a>00202
<a name="l00203"></a>00203 <span class="comment">// Server side : destroy the semaphore</span>
<a name="l00204"></a>00204 <span class="keywordtype">void</span> JackPosixSemaphore::Destroy()
<a name="l00205"></a>00205 {
<a name="l00206"></a>00206 <span class="keywordflow">if</span> (fSemaphore != NULL) {
<a name="l00207"></a>00207 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackPosixSemaphore::Destroy"</span>);
<a name="l00208"></a>00208 sem_unlink(fName);
<a name="l00209"></a>00209 <span class="keywordflow">if</span> (sem_close(fSemaphore) != 0) {
<a name="l00210"></a>00210 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Destroy: can't destroy semaphore name = %s err = %s"</span>, fName, strerror(errno));
<a name="l00211"></a>00211 }
<a name="l00212"></a>00212 fSemaphore = NULL;
<a name="l00213"></a>00213 } <span class="keywordflow">else</span> {
<a name="l00214"></a>00214 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackPosixSemaphore::Destroy semaphore == NULL"</span>);
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216 }
<a name="l00217"></a>00217
<a name="l00218"></a>00218 } <span class="comment">// end of namespace</span>
<a name="l00219"></a>00219
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