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142 lines
3.5 KiB
142 lines
3.5 KiB
// hrtimer.cpp - written and placed in the public domain by Wei Dai |
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#include "pch.h" |
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#include "hrtimer.h" |
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#include "misc.h" |
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#include <stddef.h> // for NULL |
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#include <time.h> |
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#if defined(CRYPTOPP_WIN32_AVAILABLE) |
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#include <windows.h> |
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#elif defined(CRYPTOPP_UNIX_AVAILABLE) |
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#include <sys/time.h> |
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#include <sys/times.h> |
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#include <unistd.h> |
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#endif |
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#include <assert.h> |
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NAMESPACE_BEGIN(CryptoPP) |
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#ifndef CRYPTOPP_IMPORTS |
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double TimerBase::ConvertTo(TimerWord t, Unit unit) |
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{ |
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static unsigned long unitsPerSecondTable[] = {1, 1000, 1000*1000, 1000*1000*1000}; |
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// When 'unit' is an enum 'Unit', a Clang warning is generated. |
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assert(static_cast<unsigned int>(unit) < COUNTOF(unitsPerSecondTable)); |
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return (double)CRYPTOPP_VC6_INT64 t * unitsPerSecondTable[unit] / CRYPTOPP_VC6_INT64 TicksPerSecond(); |
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} |
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void TimerBase::StartTimer() |
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{ |
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m_last = m_start = GetCurrentTimerValue(); |
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m_started = true; |
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} |
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double TimerBase::ElapsedTimeAsDouble() |
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{ |
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if (m_stuckAtZero) |
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return 0; |
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if (m_started) |
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{ |
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TimerWord now = GetCurrentTimerValue(); |
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if (m_last < now) // protect against OS bugs where time goes backwards |
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m_last = now; |
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return ConvertTo(m_last - m_start, m_timerUnit); |
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} |
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StartTimer(); |
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return 0; |
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} |
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unsigned long TimerBase::ElapsedTime() |
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{ |
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double elapsed = ElapsedTimeAsDouble(); |
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assert(elapsed <= ULONG_MAX); |
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return (unsigned long)elapsed; |
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} |
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TimerWord Timer::GetCurrentTimerValue() |
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{ |
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#if defined(CRYPTOPP_WIN32_AVAILABLE) |
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// Use the first union member to avoid an uninitialized warning |
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LARGE_INTEGER now = {0,0}; |
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if (!QueryPerformanceCounter(&now)) |
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throw Exception(Exception::OTHER_ERROR, "Timer: QueryPerformanceCounter failed with error " + IntToString(GetLastError())); |
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return now.QuadPart; |
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#elif defined(CRYPTOPP_UNIX_AVAILABLE) |
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timeval now; |
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gettimeofday(&now, NULL); |
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return (TimerWord)now.tv_sec * 1000000 + now.tv_usec; |
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#else |
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// clock_t now; |
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return clock(); |
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#endif |
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} |
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TimerWord Timer::TicksPerSecond() |
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{ |
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#if defined(CRYPTOPP_WIN32_AVAILABLE) |
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// Use the second union member to avoid an uninitialized warning |
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static LARGE_INTEGER freq = {0,0}; |
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if (freq.QuadPart == 0) |
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{ |
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if (!QueryPerformanceFrequency(&freq)) |
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throw Exception(Exception::OTHER_ERROR, "Timer: QueryPerformanceFrequency failed with error " + IntToString(GetLastError())); |
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} |
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return freq.QuadPart; |
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#elif defined(CRYPTOPP_UNIX_AVAILABLE) |
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return 1000000; |
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#else |
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return CLOCKS_PER_SEC; |
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#endif |
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} |
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#endif // #ifndef CRYPTOPP_IMPORTS |
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TimerWord ThreadUserTimer::GetCurrentTimerValue() |
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{ |
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#if defined(CRYPTOPP_WIN32_AVAILABLE) |
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static bool getCurrentThreadImplemented = true; |
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if (getCurrentThreadImplemented) |
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{ |
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FILETIME now, ignored; |
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if (!GetThreadTimes(GetCurrentThread(), &ignored, &ignored, &ignored, &now)) |
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{ |
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DWORD lastError = GetLastError(); |
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if (lastError == ERROR_CALL_NOT_IMPLEMENTED) |
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{ |
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getCurrentThreadImplemented = false; |
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goto GetCurrentThreadNotImplemented; |
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} |
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throw Exception(Exception::OTHER_ERROR, "ThreadUserTimer: GetThreadTimes failed with error " + IntToString(lastError)); |
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} |
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return now.dwLowDateTime + ((TimerWord)now.dwHighDateTime << 32); |
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} |
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GetCurrentThreadNotImplemented: |
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return (TimerWord)clock() * (10*1000*1000 / CLOCKS_PER_SEC); |
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#elif defined(CRYPTOPP_UNIX_AVAILABLE) |
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tms now; |
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times(&now); |
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return now.tms_utime; |
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#else |
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return clock(); |
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#endif |
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} |
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TimerWord ThreadUserTimer::TicksPerSecond() |
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{ |
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#if defined(CRYPTOPP_WIN32_AVAILABLE) |
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return 10*1000*1000; |
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#elif defined(CRYPTOPP_UNIX_AVAILABLE) |
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static const long ticksPerSecond = sysconf(_SC_CLK_TCK); |
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return ticksPerSecond; |
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#else |
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return CLOCKS_PER_SEC; |
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#endif |
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} |
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NAMESPACE_END
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