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1.3.3 Predefined Chronometers

A chronometer is a device used to measure time. It is an specialization of the micro_benchmark_meter type used to calculate the sample time and the total time (see Chronometer Reference for a detailed description.)

The following chronometers are implemented by the library:

• time_t (Always)

  Realtime chronometer based on the the C standard type time_t, retrieved from time function. It represents seconds, so its minimum resolution is one second.

• clock_t (Always)

  Process time chronometer based on the C standard type clock_t, retrieved from clock function. It overflows easily; this is not checked by the framework.

• gettimeofday (Optional)

  Realtime chronometer based on the function gettimeofday. Its values are represented by struct timeval.

• clock_gettime (Optional)

  Chronometer based on the function clock_gettime. Its minimum theoretical resolution is calculated based on the clock type selected (see Time Reference.) Its values are represented by struct timespec.