Calculate execution time when sleep() is used

Question

I am trying to read data from the ADC in the Beagle Bone, running Angstrom Linux distribution. I need to use a delay mechanism like sleep(), to only read samples at

Answer 1

I use MACRO to print the elapse time.

#include 
#include 
#include 
#define ELPS_TIME(func_name) do { \
    struct timeval tval_before, tval_after, tval_result; \
    gettimeofday(&tval_before, NULL); \
    func_name; \
    gettimeofday(&tval_after, NULL); \
    timersub(&tval_after, &tval_before, &tval_result); \
    printf("Time elapsed: %ld.%06ld seconds\n", \
        (long int)tval_result.tv_sec, \
        (long int)tval_result.tv_usec); } while(0)

static void test_func1() {
    printf("%s:", __FUNCTION__);
    sleep(1);
}

static void test_func2() {
    printf("%s:", __FUNCTION__);
    sleep(2);
}

int main() {
    ELPS_TIME(test_func1()); //calling test_func1 
    ELPS_TIME(test_func2()); //calling test_func2
    return 0;
}

Output:

test_func1:Time elapsed: 1.000103 seconds                                                                             
test_func2:Time elapsed: 2.000974 seconds