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86 irasnyd 1 
/* timing.c -- A holder for some functions to find execution time
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 *
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 * Written By: Ira Snyder
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 * Started On: 06-02-2005
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 *
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 * License: MIT License
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 * License: http://www.opensource.org/licenses/mit-license.php
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 *
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 * These are used to time the execution time of pieces of code.
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 * Use like this:
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 *
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 * startclock();
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 * ... run something here ...
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 * stopclock();
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 * printtimetaken("SOME NAME");
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 *
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 * And that's it!
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 */
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#ifndef TIMING_C
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#define TIMING_C
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#include <stdio.h> /* for printf() */
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#include <time.h>  /* for gettimeofday() */
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/* global timeval for timing the function calls */
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struct timeval start_time, end_time;
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/* start the clock (for timing) */
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void startclock (void)
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{
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    gettimeofday(&start_time, NULL);
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}
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/* stop the clock (for timing) */
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void stopclock (void)
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{
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    gettimeofday(&end_time, NULL);
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}
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87 irasnyd 41 
/* print the time taken, in milliseconds = seconds/1000 */
86 irasnyd 42 
void printtimetaken (char *funcname)
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{
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    double total_usecs = (end_time.tv_sec-start_time.tv_sec) * 1000000.0
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                       + (end_time.tv_usec-start_time.tv_usec);
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    printf("%s : %.3lf milliseconds\n", funcname, total_usecs/1000.0);
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}
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#endif