Question

I’m running a giant simulation / with a graphics engine.

There are lots of events that are flying by.

I would like to timestamp them (measured in milliseconds since the start of program execution).

What should I be using for this? [What library?]

Answer 1

Since Mac OS X is Unix based, try gettimeofday(). It will return seconds and microseconds, up to the resolution of the system clock.

#include <sys/types.h>    
int gettimeofday(struct timeval *tv, struct timezone *tz);

struct timeval {
    time_t      tv_sec;     /* seconds */
    suseconds_t tv_usec;    /* microseconds */
};