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<h1>hrtimer.cpp</h1><pre class="fragment"><div>00001 <span class="comment">// hrtimer.cpp - written and placed in the public domain by Wei Dai</span>
00002
00003 <span class="preprocessor">#include "pch.h"</span>
00004 <span class="preprocessor">#include "hrtimer.h"</span>
00005 <span class="preprocessor">#include "misc.h"</span>
00006 <span class="preprocessor">#include <stddef.h></span> <span class="comment">// for NULL</span>
00007 <span class="preprocessor">#include <time.h></span>
00008
00009 <span class="preprocessor">#if defined(CRYPTOPP_WIN32_AVAILABLE)</span>
00010 <span class="preprocessor"></span><span class="preprocessor">#include <windows.h></span>
00011 <span class="preprocessor">#elif defined(CRYPTOPP_UNIX_AVAILABLE)</span>
00012 <span class="preprocessor"></span><span class="preprocessor">#include <sys/time.h></span>
00013 <span class="preprocessor">#include <sys/times.h></span>
00014 <span class="preprocessor">#include <unistd.h></span>
00015 <span class="preprocessor">#endif</span>
00016 <span class="preprocessor"></span>
00017 <span class="preprocessor">#include <assert.h></span>
00018
00019 NAMESPACE_BEGIN(CryptoPP)
00020
00021 double <a class="code" href="class_timer_base.html">TimerBase</a>::ConvertTo(word64 t, Unit unit)
00022 {
00023 <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> unitsPerSecondTable[] = {1, 1000, 1000*1000, 1000*1000*1000};
00024
00025 assert(unit < <span class="keyword">sizeof</span>(unitsPerSecondTable) / <span class="keyword">sizeof</span>(unitsPerSecondTable[0]));
00026 <span class="keywordflow">return</span> (<span class="keywordtype">double</span>)t * unitsPerSecondTable[unit] / TicksPerSecond();
00027 }
00028
00029 <span class="keywordtype">void</span> TimerBase::StartTimer()
00030 {
00031 m_start = GetCurrentTimerValue();
00032 m_started = <span class="keyword">true</span>;
00033 }
00034
00035 <span class="keywordtype">double</span> TimerBase::ElapsedTimeAsDouble()
00036 {
00037 <span class="keywordflow">if</span> (m_stuckAtZero)
00038 <span class="keywordflow">return</span> 0;
00039 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_started)
00040 <span class="keywordflow">return</span> ConvertTo(GetCurrentTimerValue() - m_start, m_timerUnit);
00041 <span class="keywordflow">else</span>
00042 {
00043 StartTimer();
00044 <span class="keywordflow">return</span> 0;
00045 }
00046 }
00047
00048 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> TimerBase::ElapsedTime()
00049 {
00050 <span class="keywordtype">double</span> elapsed = ElapsedTimeAsDouble();
00051 assert(elapsed <= ULONG_MAX);
00052 <span class="keywordflow">return</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>)elapsed;
00053 }
00054
00055 word64 ThreadUserTimer::GetCurrentTimerValue()
00056 {
00057 <span class="preprocessor">#if defined(CRYPTOPP_WIN32_AVAILABLE)</span>
00058 <span class="preprocessor"></span> <span class="keyword">static</span> <span class="keywordtype">bool</span> getCurrentThreadImplemented = <span class="keyword">true</span>;
00059 <span class="keywordflow">if</span> (getCurrentThreadImplemented)
00060 {
00061 FILETIME now, ignored;
00062 <span class="keywordflow">if</span> (!GetThreadTimes(GetCurrentThread(), &ignored, &ignored, &ignored, &now))
00063 {
00064 DWORD lastError = GetLastError();
00065 <span class="keywordflow">if</span> (lastError == ERROR_CALL_NOT_IMPLEMENTED)
00066 {
00067 getCurrentThreadImplemented = <span class="keyword">false</span>;
00068 <span class="keywordflow">goto</span> GetCurrentThreadNotImplemented;
00069 }
00070 <span class="keywordflow">throw</span> <a class="code" href="class_exception.html">Exception</a>(Exception::OTHER_ERROR, <span class="stringliteral">"ThreadUserTimer: GetThreadTimes failed with error "</span> + IntToString(lastError));
00071 }
00072 <span class="keywordflow">return</span> now.dwLowDateTime + ((word64)now.dwHighDateTime << 32);
00073 }
00074 GetCurrentThreadNotImplemented:
00075 <span class="keywordflow">return</span> (word64)clock() * (10*1000*1000 / CLOCKS_PER_SEC);
00076 <span class="preprocessor">#elif defined(CRYPTOPP_UNIX_AVAILABLE)</span>
00077 <span class="preprocessor"></span> tms now;
00078 times(&now);
00079 <span class="keywordflow">return</span> now.tms_utime;
00080 <span class="preprocessor">#else</span>
00081 <span class="preprocessor"></span> <span class="keywordflow">return</span> clock();
00082 <span class="preprocessor">#endif</span>
00083 <span class="preprocessor"></span>}
00084
00085 word64 ThreadUserTimer::TicksPerSecond()
00086 {
00087 <span class="preprocessor">#if defined(CRYPTOPP_WIN32_AVAILABLE)</span>
00088 <span class="preprocessor"></span> <span class="keywordflow">return</span> 10*1000*1000;
00089 <span class="preprocessor">#elif defined(CRYPTOPP_UNIX_AVAILABLE)</span>
00090 <span class="preprocessor"></span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">long</span> ticksPerSecond = sysconf(_SC_CLK_TCK);
00091 <span class="keywordflow">return</span> ticksPerSecond;
00092 <span class="preprocessor">#else</span>
00093 <span class="preprocessor"></span> <span class="keywordflow">return</span> CLOCKS_PER_SEC;
00094 <span class="preprocessor">#endif</span>
00095 <span class="preprocessor"></span>}
00096
00097 <span class="preprocessor">#ifdef HIGHRES_TIMER_AVAILABLE</span>
00098 <span class="preprocessor"></span>
00099 word64 Timer::GetCurrentTimerValue()
00100 {
00101 <span class="preprocessor">#if defined(CRYPTOPP_WIN32_AVAILABLE)</span>
00102 <span class="preprocessor"></span> LARGE_INTEGER now;
00103 <span class="keywordflow">if</span> (!QueryPerformanceCounter(&now))
00104 <span class="keywordflow">throw</span> <a class="code" href="class_exception.html">Exception</a>(Exception::OTHER_ERROR, <span class="stringliteral">"Timer: QueryPerformanceCounter failed with error "</span> + IntToString(GetLastError()));
00105 <span class="keywordflow">return</span> now.QuadPart;
00106 <span class="preprocessor">#elif defined(CRYPTOPP_UNIX_AVAILABLE)</span>
00107 <span class="preprocessor"></span> timeval now;
00108 gettimeofday(&now, NULL);
00109 <span class="keywordflow">return</span> (word64)now.tv_sec * 1000000 + now.tv_usec;
00110 <span class="preprocessor">#endif</span>
00111 <span class="preprocessor"></span>}
00112
00113 word64 Timer::TicksPerSecond()
00114 {
00115 <span class="preprocessor">#if defined(CRYPTOPP_WIN32_AVAILABLE)</span>
00116 <span class="preprocessor"></span> <span class="keyword">static</span> LARGE_INTEGER freq = {0};
00117 <span class="keywordflow">if</span> (freq.QuadPart == 0)
00118 {
00119 <span class="keywordflow">if</span> (!QueryPerformanceFrequency(&freq))
00120 <span class="keywordflow">throw</span> <a class="code" href="class_exception.html">Exception</a>(Exception::OTHER_ERROR, <span class="stringliteral">"Timer: QueryPerformanceFrequency failed with error "</span> + IntToString(GetLastError()));
00121 }
00122 <span class="keywordflow">return</span> freq.QuadPart;
00123 <span class="preprocessor">#elif defined(CRYPTOPP_UNIX_AVAILABLE)</span>
00124 <span class="preprocessor"></span> <span class="keywordflow">return</span> 1000000;
00125 <span class="preprocessor">#endif</span>
00126 <span class="preprocessor"></span>}
00127
00128 <span class="preprocessor">#endif</span>
00129 <span class="preprocessor"></span>
00130 NAMESPACE_END
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 7 08:23:57 2004 for Crypto++ by
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