clock.cxx

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// $Id$
 
#include "CxxUtils/clock.h"
 
#if defined (__APPLE__) && __clang_major__ < 12
#include <stdint.h>
#include <mach/mach_time.h> 
 
long clock_gettime (unsigned int /*which_clock*/, struct timespec *tp) 
{
    uint64_t time = 0;
    mach_timebase_info_data_t info;
    kern_return_t err = mach_timebase_info( &info );
        
    //Convert the timebase into seconds
    if( err == 0  ) {
        uint64_t mach_time = mach_absolute_time( );
        time = mach_time * info.numer / info.denom; 
    }
    tp->tv_sec  = time * 1e-9;
    tp->tv_nsec = time - (tp->tv_sec * 1e9);
    return 0;
}
#endif