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authorneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
committerneodarz <neodarz@neodarz.net>2018-08-11 20:21:34 +0200
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+<hr><h1>time_nl.cpp</h1><a href="time__nl_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
+00007 <font class="comment">/* Copyright, 2000 Nevrax Ltd.</font>
+00008 <font class="comment"> *</font>
+00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
+00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
+00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
+00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
+00013 <font class="comment"> * any later version.</font>
+00014 <font class="comment"></font>
+00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
+00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
+00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
+00018 <font class="comment"> * General Public License for more details.</font>
+00019 <font class="comment"></font>
+00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
+00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
+00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
+00023 <font class="comment"> * MA 02111-1307, USA.</font>
+00024 <font class="comment"> */</font>
+00025
+00026 <font class="preprocessor">#include "<a class="code" href="stdmisc_8h.html">stdmisc.h</a>"</font>
+00027
+00028 <font class="preprocessor">#include &lt;time.h&gt;</font>
+00029
+00030 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00031 <font class="preprocessor"></font><font class="preprocessor"># include &lt;windows.h&gt;</font>
+00032 <font class="preprocessor">#elif defined (NL_OS_UNIX)</font>
+00033 <font class="preprocessor"></font><font class="preprocessor"># include &lt;sys/time.h&gt;</font>
+00034 <font class="preprocessor"># include &lt;<a class="code" href="unistd_8h.html">unistd.h</a>&gt;</font>
+00035 <font class="preprocessor">#endif</font>
+00036 <font class="preprocessor"></font>
+00037 <font class="preprocessor">#include "<a class="code" href="time__nl_8h.html">nel/misc/time_nl.h</a>"</font>
+00038
+00039 <font class="keyword">namespace </font>NLMISC
+00040 {
+00041
+00042 <font class="comment">/*</font>
+00043 <font class="comment"> *</font>
+00044 <font class="comment"> */</font>
+<a name="l00045"></a><a class="code" href="classNLMISC_1_1CTime.html#d0">00045</a> uint32 CTime::getSecondsSince1970 ()
+00046 {
+00047 <font class="keywordflow">return</font> (uint32) time (NULL);
+00048 }
+00049
+00050
+00051
+00052 <font class="comment">/*</font>
+00053 <font class="comment"> *</font>
+00054 <font class="comment"> */</font>
+<a name="l00055"></a><a class="code" href="classNLMISC_1_1CTime.html#d1">00055</a> <a class="code" href="namespaceNLMISC.html#a183">TTime</a> CTime::getLocalTime ()
+00056 {
+00057 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00058 <font class="preprocessor"></font>
+00059 <font class="keyword">static</font> <font class="keywordtype">bool</font> byperfcounter;
+00060 <font class="keyword">static</font> <font class="keywordtype">bool</font> initdone = <font class="keyword">false</font>;
+00061
+00062 <font class="comment">// Initialization</font>
+00063 <font class="keywordflow">if</font> ( ! initdone )
+00064 {
+00065 byperfcounter = (<a class="code" href="classNLMISC_1_1CTime.html#d2">getPerformanceTime</a>() != 0);
+00066 initdone = <font class="keyword">true</font>;
+00067 }
+00068
+00069 <font class="comment">/* Retrieve time is ms</font>
+00070 <font class="comment"> * Why do we prefer getPerformanceTime() to timeGetTime() ? Because on one dual-processor Win2k</font>
+00071 <font class="comment"> * PC, we have noticed that timeGetTime() slows down when the client is running !!!</font>
+00072 <font class="comment"> */</font>
+00073
+00074
+00075 <font class="comment">/* Now we have noticed that on all WinNT4 PC the getPerformanceTime can give us value that</font>
+00076 <font class="comment"> * are less than previous</font>
+00077 <font class="comment"> */</font>
+00078
+00079 <font class="comment">//if ( byperfcounter )</font>
+00080 <font class="comment">//{</font>
+00081 <font class="comment">// return (TTime)(ticksToSecond(getPerformanceTime()) * 1000.0f);</font>
+00082 <font class="comment">//}</font>
+00083 <font class="comment">//else</font>
+00084 <font class="comment">//{</font>
+00085 <font class="keywordflow">return</font> timeGetTime();
+00086 <font class="comment">//}</font>
+00087
+00088 <font class="preprocessor">#elif defined (NL_OS_UNIX)</font>
+00089 <font class="preprocessor"></font>
+00090 <font class="keyword">struct </font>timeval tv;
+00091
+00092 <font class="keywordflow">if</font> ( gettimeofday( &amp;tv, NULL) == -1 )
+00093 {
+00094 <a class="code" href="debug_8h.html#a3">nlerror</a> (<font class="stringliteral">"Cannot get time of day."</font>);
+00095 }
+00096 <font class="keywordflow">return</font> (TTime)tv.tv_sec * (TTime)1000 + (TTime)tv.tv_usec / (TTime)1000;
+00097
+00098 <font class="preprocessor">#endif</font>
+00099 <font class="preprocessor"></font>}
+00100
+00101
+00102 <font class="comment">/*</font>
+00103 <font class="comment"> *</font>
+00104 <font class="comment"> */</font>
+<a name="l00105"></a><a class="code" href="classNLMISC_1_1CTime.html#d2">00105</a> <a class="code" href="namespaceNLMISC.html#a184">TTicks</a> CTime::getPerformanceTime ()
+00106 {
+00107 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00108 <font class="preprocessor"></font> LARGE_INTEGER ret;
+00109 <font class="keywordflow">if</font> (QueryPerformanceCounter (&amp;ret))
+00110 <font class="keywordflow">return</font> ret.QuadPart;
+00111 <font class="keywordflow">else</font>
+00112 <font class="keywordflow">return</font> 0;
+00113 <font class="preprocessor">#else // NL_OS_WINDOWS</font>
+00114 <font class="preprocessor"></font>
+00115 <font class="preprocessor">#ifdef HAVE_X86</font>
+00116 <font class="preprocessor"></font> <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> <font class="keywordtype">long</font> <font class="keywordtype">int</font> <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
+00117 __asm__ <font class="keyword">volatile</font> (<font class="stringliteral">".byte 0x0f, 0x31"</font> : <font class="stringliteral">"=A"</font> (x));
+00118 <font class="keywordflow">return</font> <a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>;
+00119 <font class="preprocessor">#else HAVE_X86</font>
+00120 <font class="preprocessor"></font> <font class="keyword">static</font> <font class="keywordtype">bool</font> firstWarn = <font class="keyword">true</font>;
+00121 <font class="keywordflow">if</font> (firstWarn)
+00122 {
+00123 <a class="code" href="debug_8h.html#a2">nlwarning</a> (<font class="stringliteral">"TTicks CTime::getPerformanceTime () is not implemented for your processor, returning 0"</font>);
+00124 firstWarn = <font class="keyword">false</font>;
+00125 }
+00126 <font class="keywordflow">return</font> 0;
+00127 <font class="preprocessor">#endif // HAVE_X86</font>
+00128 <font class="preprocessor"></font>
+00129 <font class="preprocessor">#endif // NL_OS_WINDOWS</font>
+00130 <font class="preprocessor"></font>}
+00131 <font class="comment">/*</font>
+00132 <font class="comment">#define GETTICKS(t) asm volatile ("push %%esi\n\t" "mov %0, %%esi" : : "r" (t)); \</font>
+00133 <font class="comment"> asm volatile ("push %eax\n\t" "push %edx"); \</font>
+00134 <font class="comment"> asm volatile ("rdtsc"); \</font>
+00135 <font class="comment"> asm volatile ("movl %eax, (%esi)\n\t" "movl %edx, 4(%esi)"); \</font>
+00136 <font class="comment"> asm volatile ("pop %edx\n\t" "pop %eax\n\t" "pop %esi"); </font>
+00137 <font class="comment">*/</font>
+00138
+00139
+00140 <font class="comment">/*</font>
+00141 <font class="comment"> *</font>
+00142 <font class="comment"> */</font>
+<a name="l00143"></a><a class="code" href="classNLMISC_1_1CTime.html#d3">00143</a> <font class="keywordtype">double</font> CTime::ticksToSecond (<a class="code" href="namespaceNLMISC.html#a184">TTicks</a> ticks)
+00144 {
+00145 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
+00146 <font class="preprocessor"></font> LARGE_INTEGER ret;
+00147 <font class="keywordflow">if</font> (QueryPerformanceFrequency(&amp;ret))
+00148 {
+00149 <font class="keywordflow">return</font> (double)(sint64)ticks/(double)ret.QuadPart;
+00150 }
+00151 <font class="keywordflow">else</font>
+00152 <font class="preprocessor">#endif // NL_OS_WINDOWS</font>
+00153 <font class="preprocessor"></font> {
+00154 <font class="keyword">static</font> <font class="keywordtype">bool</font> benchFrequency = <font class="keyword">true</font>;
+00155 <font class="keyword">static</font> sint64 freq = 0;
+00156 <font class="keywordflow">if</font> (benchFrequency)
+00157 {
+00158 <font class="comment">// try to have an estimation of the cpu frequency</font>
+00159
+00160 <a class="code" href="namespaceNLMISC.html#a184">TTicks</a> tickBefore = <a class="code" href="classNLMISC_1_1CTime.html#d2">getPerformanceTime</a> ();
+00161 <a class="code" href="namespaceNLMISC.html#a184">TTicks</a> tickAfter = tickBefore;
+00162 <a class="code" href="namespaceNLMISC.html#a183">TTime</a> timeBefore = <a class="code" href="classNLMISC_1_1CTime.html#d1">getLocalTime</a> ();
+00163 <a class="code" href="namespaceNLMISC.html#a183">TTime</a> timeAfter = timeBefore;
+00164 <font class="keywordflow">while</font> (true)
+00165 {
+00166 <font class="keywordflow">if</font> (timeAfter - timeBefore &gt; 1000)
+00167 <font class="keywordflow">break</font>;
+00168 timeAfter = <a class="code" href="classNLMISC_1_1CTime.html#d1">getLocalTime</a> ();
+00169 tickAfter = <a class="code" href="classNLMISC_1_1CTime.html#d2">getPerformanceTime</a> ();
+00170 }
+00171
+00172 <a class="code" href="namespaceNLMISC.html#a183">TTime</a> timeDelta = timeAfter - timeBefore;
+00173 <a class="code" href="namespaceNLMISC.html#a184">TTicks</a> tickDelta = tickAfter - tickBefore;
+00174
+00175 freq = 1000 * tickDelta / timeDelta;
+00176 benchFrequency = <font class="keyword">false</font>;
+00177 }
+00178
+00179 <font class="keywordflow">return</font> (double)(sint64)ticks/(double)freq;
+00180 }
+00181 }
+00182
+00183
+00184 } <font class="comment">// NLMISC</font>
+</pre></div>
+
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