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MrSaturnFan

Timing a C program

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I need to be able to time how long certain things took in my program. I tried using the time.h time function...but that only returns a long int in seconds. What I need is something that can time it in milliseconds. And it must be C and not C++.

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Guest Anonymous Poster
gettimeofday

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C has the "clock" function in time.h. It "returns the implementation's best approximation to the processor time used by the program..." (7.23.2.1). There's also a macro called CLOCKS_PER_SEC which gives the frequency of the time returned by clock(). It probably depends on the implementation what sort of frequency you can expect.

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The following code should work on both windows and unix, and has a precission of 1 ms:


#include <sys/timeb.h>

...

double get_ms_time(void) {
#if defined(WIN32) && (defined(_MSC_VER) || defined(__MINGW32__))
struct _timeb tb;
_ftime(&tb);
#else
struct timeb tb;
ftime(&tb);
#endif
return ((double)tb.time) + ((double)tb.millitm) / 1000.0f;
}

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