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++.
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.
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; }This topic is closed to new replies.
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