|
// 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};
assert(unit < sizeof(unitsPerSecondTable) / sizeof(unitsPerSecondTable[0]));
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)
LARGE_INTEGER now;
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)
static LARGE_INTEGER freq = {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
|
By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.
If a file you wish to view isn't highlighted, and is a text file (not binary), please
let us know and we'll add colourisation support for it.
ApriorIT is a software research and development company specializing in cybersecurity and data management technology engineering. We work for a broad range of clients from Fortune 500 technology leaders to small innovative startups building unique solutions.
As Apriorit offers integrated research&development services for the software projects in such areas as endpoint security, network security, data security, embedded Systems, and virtualization, we have strong kernel and driver development skills, huge system programming expertise, and are reals fans of research projects.
Our specialty is reverse engineering, we apply it for security testing and security-related projects.
A separate department of Apriorit works on large-scale business SaaS solutions, handling tasks from business analysis, data architecture design, and web development to performance optimization and DevOps.
Official site: https://www.apriorit.com
Clutch profile: https://clutch.co/profile/apriorit
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.