diff options
Diffstat (limited to 'zen/tick_count.h')
| -rw-r--r-- | zen/tick_count.h | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/zen/tick_count.h b/zen/tick_count.h deleted file mode 100644 index 5ba4fd1b..00000000 --- a/zen/tick_count.h +++ /dev/null @@ -1,141 +0,0 @@ -// ***************************************************************************** -// * This file is part of the FreeFileSync project. It is distributed under * -// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 * -// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved * -// ***************************************************************************** - -#ifndef TICK_COUNT_H_3807326223463457 -#define TICK_COUNT_H_3807326223463457 - -#include <cstdint> -#include "type_traits.h" -#include "basic_math.h" - -#ifdef ZEN_WIN - #include "win.h" //includes "windows.h" -#elif defined ZEN_LINUX - #include <time.h> //Posix ::clock_gettime() -#elif defined ZEN_MAC - #include <mach/mach_time.h> -#endif - - -namespace zen -{ -//a portable "GetTickCount()" using "wall time equivalent" - e.g. no jumps due to ntp time corrections -class TickVal; -int64_t dist(const TickVal& lhs, const TickVal& rhs); //use absolute difference for paranoid security: even QueryPerformanceCounter "wraps-around" at *some* time - -int64_t ticksPerSec(); //return 0 on error -TickVal getTicks(); //return invalid value on error: !TickVal::isValid() - - - - - - - - - -//############################ implementation ############################## -class TickVal -{ -public: -#ifdef ZEN_WIN - using NativeVal = LARGE_INTEGER; -#elif defined ZEN_LINUX - using NativeVal = timespec; -#elif defined ZEN_MAC - using NativeVal = uint64_t; -#endif - - TickVal() {} - explicit TickVal(const NativeVal& val) : val_(val) {} - - inline friend - int64_t dist(const TickVal& lhs, const TickVal& rhs) - { -#ifdef ZEN_WIN - return numeric::dist(lhs.val_.QuadPart, rhs.val_.QuadPart); //std::abs(a - b) can lead to overflow! -#elif defined ZEN_LINUX - //structure timespec documented with members: - // time_t tv_sec seconds - // long tv_nsec nanoseconds - const int64_t deltaSec = lhs.val_.tv_sec - rhs.val_.tv_sec; - const int64_t deltaNsec = lhs.val_.tv_nsec - rhs.val_.tv_nsec; - return numeric::abs(deltaSec * 1000000000 + deltaNsec); -#elif defined ZEN_MAC - return numeric::dist(lhs.val_, rhs.val_); -#endif - } - - inline friend - bool operator<(const TickVal& lhs, const TickVal& rhs) - { -#ifdef ZEN_WIN - return lhs.val_.QuadPart < rhs.val_.QuadPart; -#elif defined ZEN_LINUX - if (lhs.val_.tv_sec != rhs.val_.tv_sec) - return lhs.val_.tv_sec < rhs.val_.tv_sec; - return lhs.val_.tv_nsec < rhs.val_.tv_nsec; -#elif defined ZEN_MAC - return lhs.val_ < rhs.val_; -#endif - } - - bool isValid() const { return dist(*this, TickVal()) != 0; } - -private: - NativeVal val_ {}; -}; - - -inline -int64_t ticksPerSec() //return 0 on error -{ -#ifdef ZEN_WIN - LARGE_INTEGER frequency = {}; - if (!::QueryPerformanceFrequency(&frequency)) //MSDN promises: "The frequency cannot change while the system is running." - return 0; //MSDN: "This won't occur on any system that runs Windows XP or later." - static_assert(sizeof(int64_t) >= sizeof(frequency.QuadPart), ""); - return frequency.QuadPart; - -#elif defined ZEN_LINUX - return 1000000000; //precision: nanoseconds - -#elif defined ZEN_MAC - mach_timebase_info_data_t tbi = {}; - if (::mach_timebase_info(&tbi) != KERN_SUCCESS) - return 0; - //structure mach_timebase_info_data_t documented with members: - // uint32_t numer; - // uint32_t denom; - return static_cast<int64_t>(1000000000) * tbi.denom / tbi.numer; -#endif -} - - -inline -TickVal getTicks() //return !isValid() on error -{ -#ifdef ZEN_WIN - LARGE_INTEGER now = {}; - if (!::QueryPerformanceCounter(&now)) - return TickVal(); - //detailed info about QPC: https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408 - //- MSDN: "No need to set the thread affinity" - -#elif defined ZEN_LINUX - //gettimeofday() seems fine but is deprecated - timespec now = {}; - if (::clock_gettime(CLOCK_MONOTONIC_RAW, &now) != 0) //CLOCK_MONOTONIC measures time reliably across processors! - return TickVal(); - -#elif defined ZEN_MAC - uint64_t now = ::mach_absolute_time(); //can this call fail??? -#endif - return TickVal(now); -} -} - -#endif //TICK_COUNT_H_3807326223463457 |