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<h1>JackShmMem.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 "JackError.h"</span>
<a name="l00021"></a>00021 <span class="preprocessor">#include "JackShmMem.h"</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <stdio.h></span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="keyword">namespace </span>Jack
<a name="l00025"></a>00025 {
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> fSegmentNum = 0;
<a name="l00028"></a>00028 <span class="keyword">static</span> <a class="code" href="struct__jack__shm__info.html">jack_shm_info_t</a> gInfo;
<a name="l00029"></a>00029 <span class="keywordtype">size_t</span> JackMem::gSize = 0;
<a name="l00030"></a>00030
<a name="l00031"></a>00031 JackShmMem::JackShmMem()
<a name="l00032"></a>00032 {
<a name="l00033"></a>00033 JackShmMemAble::Init();
<a name="l00034"></a>00034 LockMemory();
<a name="l00035"></a>00035 }
<a name="l00036"></a>00036
<a name="l00037"></a>00037 JackShmMem::~JackShmMem()
<a name="l00038"></a>00038 {
<a name="l00039"></a>00039 UnlockMemory();
<a name="l00040"></a>00040 }
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="keywordtype">void</span> JackShmMemAble::Init()
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 fInfo.index = gInfo.index;
<a name="l00045"></a>00045 fInfo.ptr.attached_at = gInfo.ptr.attached_at;
<a name="l00046"></a>00046 fInfo.size = gInfo.size;
<a name="l00047"></a>00047 }
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keywordtype">void</span>* JackShmMem::operator new(<span class="keywordtype">size_t</span> size, <span class="keywordtype">void</span>* memory)
<a name="l00050"></a>00050 {
<a name="l00051"></a>00051 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackShmMem::new placement size = %ld"</span>, size);
<a name="l00052"></a>00052 <span class="keywordflow">return</span> memory;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keywordtype">void</span>* JackShmMem::operator new(<span class="keywordtype">size_t</span> size)
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 <a class="code" href="struct__jack__shm__info.html">jack_shm_info_t</a> info;
<a name="l00058"></a>00058 JackShmMem* obj;
<a name="l00059"></a>00059 <span class="keywordtype">char</span> name[64];
<a name="l00060"></a>00060
<a name="l00061"></a>00061 snprintf(name, <span class="keyword">sizeof</span>(name), <span class="stringliteral">"/jack_shared%d"</span>, fSegmentNum++);
<a name="l00062"></a>00062
<a name="l00063"></a>00063 <span class="keywordflow">if</span> (jack_shmalloc(name, size, &info)) {
<a name="l00064"></a>00064 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"cannot create shared memory segment of size = %d"</span>, size, strerror(errno));
<a name="l00065"></a>00065 <span class="keywordflow">goto</span> error;
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keywordflow">if</span> (jack_attach_shm(&info)) {
<a name="l00069"></a>00069 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"cannot attach shared memory segment name = %s err = %s"</span>, name, strerror(errno));
<a name="l00070"></a>00070 jack_destroy_shm(&info);
<a name="l00071"></a>00071 <span class="keywordflow">goto</span> error;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074 obj = (JackShmMem*)jack_shm_addr(&info);
<a name="l00075"></a>00075 <span class="comment">// It is unsafe to set object fields directly (may be overwritten during object initialization),</span>
<a name="l00076"></a>00076 <span class="comment">// so use an intermediate global data</span>
<a name="l00077"></a>00077 gInfo.index = info.index;
<a name="l00078"></a>00078 gInfo.size = size;
<a name="l00079"></a>00079 gInfo.ptr.attached_at = info.ptr.attached_at;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackShmMem::new index = %ld attached = %x size = %ld "</span>, info.index, info.ptr.attached_at, size);
<a name="l00082"></a>00082 <span class="keywordflow">return</span> obj;
<a name="l00083"></a>00083
<a name="l00084"></a>00084 error:
<a name="l00085"></a>00085 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"JackShmMem::new bad alloc"</span>, size);
<a name="l00086"></a>00086 <span class="keywordflow">throw</span> std::bad_alloc();
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="keywordtype">void</span> JackShmMem::operator delete(<span class="keywordtype">void</span>* p, <span class="keywordtype">size_t</span> size)
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 <a class="code" href="struct__jack__shm__info.html">jack_shm_info_t</a> info;
<a name="l00092"></a>00092 JackShmMem* obj = (JackShmMem*)p;
<a name="l00093"></a>00093 info.index = obj->fInfo.index;
<a name="l00094"></a>00094 info.ptr.attached_at = obj->fInfo.ptr.attached_at;
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"JackShmMem::delete size = %ld index = %ld"</span>, size, info.index);
<a name="l00097"></a>00097
<a name="l00098"></a>00098 jack_release_shm(&info);
<a name="l00099"></a>00099 jack_destroy_shm(&info);
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="keywordtype">void</span> JackShmMem::operator delete(<span class="keywordtype">void</span>* obj)
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 <span class="keywordflow">if</span> (obj) {
<a name="l00105"></a>00105 JackShmMem::operator delete(obj, 0);
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107 }
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <span class="keywordtype">void</span> LockMemoryImp(<span class="keywordtype">void</span>* ptr, <span class="keywordtype">size_t</span> size)
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="keywordflow">if</span> (CHECK_MLOCK((<span class="keywordtype">char</span>*)ptr, size)) {
<a name="l00112"></a>00112 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"Succeeded in locking %u byte memory area"</span>, size);
<a name="l00113"></a>00113 } <span class="keywordflow">else</span> {
<a name="l00114"></a>00114 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Cannot lock down memory area (%s)"</span>, strerror(errno));
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="keywordtype">void</span> InitLockMemoryImp(<span class="keywordtype">void</span>* ptr, <span class="keywordtype">size_t</span> size)
<a name="l00119"></a>00119 {
<a name="l00120"></a>00120 <span class="keywordflow">if</span> (CHECK_MLOCK((<span class="keywordtype">char</span>*)ptr, size)) {
<a name="l00121"></a>00121 memset(ptr, 0, size);
<a name="l00122"></a>00122 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"Succeeded in locking %u byte memory area"</span>, size);
<a name="l00123"></a>00123 } <span class="keywordflow">else</span> {
<a name="l00124"></a>00124 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Cannot lock down memory area (%s)"</span>, strerror(errno));
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127
<a name="l00128"></a>00128 <span class="keywordtype">void</span> UnlockMemoryImp(<span class="keywordtype">void</span>* ptr, <span class="keywordtype">size_t</span> size)
<a name="l00129"></a>00129 {
<a name="l00130"></a>00130 <span class="keywordflow">if</span> (CHECK_MUNLOCK((<span class="keywordtype">char</span>*)ptr, size)) {
<a name="l00131"></a>00131 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"Succeeded in unlocking %u byte memory area"</span>, size);
<a name="l00132"></a>00132 } <span class="keywordflow">else</span> {
<a name="l00133"></a>00133 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Cannot unlock down memory area (%s)"</span>, strerror(errno));
<a name="l00134"></a>00134 }
<a name="l00135"></a>00135 }
<a name="l00136"></a>00136
<a name="l00137"></a>00137 <span class="keywordtype">void</span> LockAllMemory()
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (CHECK_MLOCKALL()) {
<a name="l00140"></a>00140 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"Succeeded in locking all memory"</span>);
<a name="l00141"></a>00141 } <span class="keywordflow">else</span> {
<a name="l00142"></a>00142 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Cannot lock all memory (%s)"</span>, strerror(errno));
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="keywordtype">void</span> UnlockAllMemory()
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 <span class="keywordflow">if</span> (CHECK_MUNLOCKALL()) {
<a name="l00149"></a>00149 <a class="code" href="group__ServerControl.html#ga35f69faaee3bb9b958ed8c9a5f62246c">jack_log</a>(<span class="stringliteral">"Succeeded in unlocking all memory"</span>);
<a name="l00150"></a>00150 } <span class="keywordflow">else</span> {
<a name="l00151"></a>00151 <a class="code" href="group__ServerControl.html#gac6448626e0b75fc6d9da1ccbdca0355e">jack_error</a>(<span class="stringliteral">"Cannot unlock all memory (%s)"</span>, strerror(errno));
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154
<a name="l00155"></a>00155
<a name="l00156"></a>00156 } <span class="comment">// end of namespace</span>
<a name="l00157"></a>00157
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