clock
Returns the number of hundredths of seconds since the NLM ™ application began executing
#include <time.h>
clock_t clock (void);
Returns the number of hundredths of seconds encoded into type clock_t.
It is often important to run benchmarks or measure the time it takes for a process to execute. The following example shows how to call clock to time a process down to 1/100 of a second. In the example, assume that CLK_TCK is a constant equal to 100.
asctime_r requires the user to pass storage for the function result, rather than relying on a global variable for the result as in asctime.