FLA_Clock.c File Reference

(r)

Functions
double	FLA_Clock_helper (void)
double	FLA_Clock ()
void	detect_clocks (void)
void	rdtsc (unsigned int *high, unsigned int *low)

Variables
double	gtod_ref_time_sec = 0.0

Function Documentation

detect_clocks()

void detect_clocks

(

void

)

{
  FILE *infile;
  char buffer[256], *p;
#ifdef __i386__
  unsigned int high, low;
#endif
 
  if ( clocks == 0.0 )
  {
    p = (char *)NULL;
    infile = fopen("/proc/cpuinfo", "r");
    while (fgets(buffer, sizeof(buffer), infile))
    {
      if (!strncmp("cpu MHz", buffer, 6))
      {
        p = strchr(buffer, ':') + 1;
        break;
      }
    }
    clocks = 1.e6 * atof(p);
#ifdef __i386__
    rdtsc(&high, &low);
    initialclockoffset = high;
#endif
  }
}

References i.

FLA_Clock()

double FLA_Clock

(

void

)

{
  return FLA_Clock_helper();
}

References FLA_Clock_helper().

Referenced by FLASH_Queue_begin(), FLASH_Queue_end(), and FLASH_Queue_exec().

FLA_Clock_helper()

double FLA_Clock_helper

(

void

)

{
#ifdef FLA_ENABLE_TIDSP
  double the_time;
  the_time = 0.0;
#else
#ifdef FLA_PORTABLE_TIMER_IS_CLOCK_GETTIME
  double          the_time, norm_sec;
  struct timespec tsp;
 
  clock_gettime( CLOCK_REALTIME, &tsp );
 
  // If this is the first invocation of through FLA_Clock(), then initialize
  // the "reference time" global variable to the seconds field of the tv
  // struct.
  if ( gtod_ref_time_sec == 0.0 ) gtod_ref_time_sec = ( double ) tsp.tv_sec;
 
  // Normalize the seconds field of the tv struct so that it is relative to the
  // "reference time" that was recorded during the first invocation of
  // FLA_Clock().
  norm_sec = ( double ) tsp.tv_sec - gtod_ref_time_sec;
 
  // Compute the number of seconds since the reference time.
  the_time = norm_sec + tsp.tv_nsec * 1.0e-9;
 
#else
#ifdef FLA_PORTABLE_TIMER_IS_GETTIMEOFDAY
  
  double         the_time, norm_sec;
  struct timeval tv;
 
  gettimeofday( &tv, NULL );
 
  // If this is the first invocation of through FLA_Clock(), then initialize
  // the "reference time" global variable to the seconds field of the tv
  // struct.
  if ( gtod_ref_time_sec == 0.0 ) gtod_ref_time_sec = ( double ) tv.tv_sec;
 
  // Normalize the seconds field of the tv struct so that it is relative to the
  // "reference time" that was recorded during the first invocation of
  // FLA_Clock().
  norm_sec = ( double ) tv.tv_sec - gtod_ref_time_sec;
 
  // Compute the number of seconds since the reference time.
  the_time = norm_sec + tv.tv_usec * 1.0e-6;
 
#else //#ifdef FLA_PORTABLE_TIMER_IS_UNKNOWN
 
  the_time = 0.0;
 
#endif
#endif
#endif
 
  return the_time;
}

References gtod_ref_time_sec, and i.

Referenced by FLA_Clock().

rdtsc()

void rdtsc ( unsigned int *  high, unsigned int *  low  )

inline

{
  asm("rdtsc" : "=a" (*low), "=d"(*high): : "cc");
}

Variable Documentation

gtod_ref_time_sec

double gtod_ref_time_sec = 0.0

Referenced by FLA_Clock_helper().