140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
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// 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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assert(unit < sizeof(unitsPerSecondTable) / sizeof(unitsPerSecondTable[0]));
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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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LARGE_INTEGER now;
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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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static LARGE_INTEGER freq = {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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