02-06-2013
First of all I'd like to state that I'm a not an expert in C.
I use in C++ the boost::timer library which is an excellent one to do those calculations.
If you don't want to add dependencies to your project you can do the following:
when the function that you want to calculate time starts start a thread that will count time : see man 3 usleep or man 3 sleep or man 3 nanosleep.
This thread sleeps a number of time which increase every n time unit.
This thread stops counting when the other function finish the procedure and change a boolean value to true.
I think the above solution will not be really efficient but it can work.
Experts in C should have a better answer to this question.
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LEARN ABOUT MOJAVE
usleep
USLEEP(3) BSD Library Functions Manual USLEEP(3)
NAME
usleep -- suspend thread execution for an interval measured in microseconds
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
usleep(useconds_t microseconds);
DESCRIPTION
The usleep() function suspends execution of the calling thread until either microseconds microseconds have elapsed or a signal is delivered
to the thread and its action is to invoke a signal-catching function or to terminate the process. System activity or limitations may
lengthen the sleep by an indeterminate amount.
This function is implemented using nanosleep(2) by pausing for microseconds microseconds or until a signal occurs. Consequently, in this
implementation, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM. Also, this implementa-
tion does not put a limit on the value of microseconds (other than that limited by the size of the useconds_t type); some other platforms
require it to be less than one million.
NOTE
The usleep() function is obsolescent. Use nanosleep(2) instead.
RETURN VALUES
The usleep() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The usleep() function will fail if:
[EINTR] A signal was delivered to the process and its action was to invoke a signal-catching function.
SEE ALSO
nanosleep(2), sleep(3)
HISTORY
The usleep() function appeared in 4.3BSD.
BSD
February 13, 1998 BSD