tickconverter.cpp

using namespace std::chrono;
namespace alib::time {
 
 
#   include "ALib.Lang.CIMethods.H"
 
//##################################################################################################
// TickConverter
//##################################################################################################
void TickConverter::SyncClocks( int qtyRepeats ) {
    Ticks::TTimePoint       steadyClock;
    DateTime::TTimePoint    systemClock;
    uint64_t lastDiff= 0;
    for( int i= 0 ; i < qtyRepeats ; ++i ) {
        systemClock= system_clock::now();
        steadyClock= steady_clock::now();
 
        auto systemCount= systemClock.time_since_epoch().count();
        auto steadyCount= steadyClock.time_since_epoch().count();
 
        // This cannot be optimized, because:
        // a) we have to use an unsigned integer, and
        // b) we have to take into account which clock was measured first and which last. If
        //    interrupted between the calls, the difference either shrinks or increases.
        if( systemCount < steadyCount ) {
            uint64_t diff= uint64_t( steadyCount - systemCount );
            if( lastDiff == 0 || diff < lastDiff ) {
                steadyClockSyncTime= steadyClock;
                systemClockSyncTime= systemClock;
                lastDiff= diff;
            }
        } else {
            uint64_t diff= uint64_t( systemCount - steadyCount  );
            if( lastDiff == 0 || diff > lastDiff ) {
                steadyClockSyncTime= steadyClock;
                systemClockSyncTime= systemClock;
                lastDiff= diff;
}   }   }   }
 
} // namespace [alib::time]