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authorDaniel Wilhelm <shieldwed@outlook.com>2017-01-08 18:21:23 +0100
committerDaniel Wilhelm <shieldwed@outlook.com>2017-01-08 18:21:23 +0100
commitfe660cdff59aa3a939479ed60172e5c0803552b2 (patch)
tree045cf295b79de10f75ed6362c5836db25c9fc63a /zen/tick_count.h
parent8.6 (diff)
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8.7
Diffstat (limited to 'zen/tick_count.h')
-rw-r--r--zen/tick_count.h141
1 files changed, 0 insertions, 141 deletions
diff --git a/zen/tick_count.h b/zen/tick_count.h
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index 5ba4fd1b..00000000
--- a/zen/tick_count.h
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@@ -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
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