/package/cryptopp563/hrtimer.cpp
C++ | 142 lines | 119 code | 18 blank | 5 comment | 11 complexity | 7d9a3ccf6ab9767b287c28a7c6d3f1ba MD5 | raw file
- // hrtimer.cpp - written and placed in the public domain by Wei Dai
-
- #include "pch.h"
- #include "hrtimer.h"
- #include "misc.h"
- #include <stddef.h> // for NULL
- #include <time.h>
-
- #if defined(CRYPTOPP_WIN32_AVAILABLE)
- #include <windows.h>
- #elif defined(CRYPTOPP_UNIX_AVAILABLE)
- #include <sys/time.h>
- #include <sys/times.h>
- #include <unistd.h>
- #endif
-
- #include <assert.h>
-
- NAMESPACE_BEGIN(CryptoPP)
-
- #ifndef CRYPTOPP_IMPORTS
-
- double TimerBase::ConvertTo(TimerWord t, Unit unit)
- {
- static unsigned long unitsPerSecondTable[] = {1, 1000, 1000*1000, 1000*1000*1000};
-
- // When 'unit' is an enum 'Unit', a Clang warning is generated.
- assert(static_cast<unsigned int>(unit) < COUNTOF(unitsPerSecondTable));
- return (double)CRYPTOPP_VC6_INT64 t * unitsPerSecondTable[unit] / CRYPTOPP_VC6_INT64 TicksPerSecond();
- }
-
- void TimerBase::StartTimer()
- {
- m_last = m_start = GetCurrentTimerValue();
- m_started = true;
- }
-
- double TimerBase::ElapsedTimeAsDouble()
- {
- if (m_stuckAtZero)
- return 0;
-
- if (m_started)
- {
- TimerWord now = GetCurrentTimerValue();
- if (m_last < now) // protect against OS bugs where time goes backwards
- m_last = now;
- return ConvertTo(m_last - m_start, m_timerUnit);
- }
-
- StartTimer();
- return 0;
- }
-
- unsigned long TimerBase::ElapsedTime()
- {
- double elapsed = ElapsedTimeAsDouble();
- assert(elapsed <= ULONG_MAX);
- return (unsigned long)elapsed;
- }
-
- TimerWord Timer::GetCurrentTimerValue()
- {
- #if defined(CRYPTOPP_WIN32_AVAILABLE)
- // Use the first union member to avoid an uninitialized warning
- LARGE_INTEGER now = {0,0};
- if (!QueryPerformanceCounter(&now))
- throw Exception(Exception::OTHER_ERROR, "Timer: QueryPerformanceCounter failed with error " + IntToString(GetLastError()));
- return now.QuadPart;
- #elif defined(CRYPTOPP_UNIX_AVAILABLE)
- timeval now;
- gettimeofday(&now, NULL);
- return (TimerWord)now.tv_sec * 1000000 + now.tv_usec;
- #else
- // clock_t now;
- return clock();
- #endif
- }
-
- TimerWord Timer::TicksPerSecond()
- {
- #if defined(CRYPTOPP_WIN32_AVAILABLE)
- // Use the second union member to avoid an uninitialized warning
- static LARGE_INTEGER freq = {0,0};
- if (freq.QuadPart == 0)
- {
- if (!QueryPerformanceFrequency(&freq))
- throw Exception(Exception::OTHER_ERROR, "Timer: QueryPerformanceFrequency failed with error " + IntToString(GetLastError()));
- }
- return freq.QuadPart;
- #elif defined(CRYPTOPP_UNIX_AVAILABLE)
- return 1000000;
- #else
- return CLOCKS_PER_SEC;
- #endif
- }
-
- #endif // #ifndef CRYPTOPP_IMPORTS
-
- TimerWord ThreadUserTimer::GetCurrentTimerValue()
- {
- #if defined(CRYPTOPP_WIN32_AVAILABLE)
- static bool getCurrentThreadImplemented = true;
- if (getCurrentThreadImplemented)
- {
- FILETIME now, ignored;
- if (!GetThreadTimes(GetCurrentThread(), &ignored, &ignored, &ignored, &now))
- {
- DWORD lastError = GetLastError();
- if (lastError == ERROR_CALL_NOT_IMPLEMENTED)
- {
- getCurrentThreadImplemented = false;
- goto GetCurrentThreadNotImplemented;
- }
- throw Exception(Exception::OTHER_ERROR, "ThreadUserTimer: GetThreadTimes failed with error " + IntToString(lastError));
- }
- return now.dwLowDateTime + ((TimerWord)now.dwHighDateTime << 32);
- }
- GetCurrentThreadNotImplemented:
- return (TimerWord)clock() * (10*1000*1000 / CLOCKS_PER_SEC);
- #elif defined(CRYPTOPP_UNIX_AVAILABLE)
- tms now;
- times(&now);
- return now.tms_utime;
- #else
- return clock();
- #endif
- }
-
- TimerWord ThreadUserTimer::TicksPerSecond()
- {
- #if defined(CRYPTOPP_WIN32_AVAILABLE)
- return 10*1000*1000;
- #elif defined(CRYPTOPP_UNIX_AVAILABLE)
- static const long ticksPerSecond = sysconf(_SC_CLK_TCK);
- return ticksPerSecond;
- #else
- return CLOCKS_PER_SEC;
- #endif
- }
-
- NAMESPACE_END