Question

How to use struct timeval to get the execution time in microseconds with C

Answer 1

#include <stdio.h>
#include <sys/time.h>

/*
  struct timeval {
    long tv_sec;    // seconds
    long tv_usec;   // microseconds
};
*/

int main() {
    struct timeval timevalBefore, timevalAfter;  

    gettimeofday(&timevalBefore, NULL);
    
    for (int i = 0; i < 10000000; i++) ;

    gettimeofday(&timevalAfter, NULL);

    printf("%ld microseconds\n", timevalAfter.tv_usec - timevalBefore.tv_usec); 

    return 0;
}



/*
run:

19592 microseconds

*/

 

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