System.nanoTime() equivalent in C

Question

Possible Duplicate:
C++ Timer function to provide time in nano seconds

I need to get out of a loop when approaching 3 seconds, so I need to calculate the elapsed time.

I'm moving some code from Java to C, and I was using the easy System.nanoTime() in Java,

How would I do that in C?

I noticed that time(NULL) will return the seconds, but I'm looking for more precision.

Thank you in advance

dupe? http://stackoverflow.com/questions/275004/c-timer-function-to-provide-time-in-nano-seconds — Otto Allmendinger, Feb 19 '10 at 11:46

score 1 · Answer 1 · answered Feb 19 '10 at 17:02

1

For the resolution you want, clock() from the C standard library is sufficient:

#include <time.h>
#define RUNTIME_MAX_SEC 3

clock_t start = clock();
while(clock() - start < CLOCKS_PER_SEC * RUNTIME_MAX_SEC)
{ ... }

answered Feb 19 '10 at 17:02

Christoph

score 0 · Answer 2 · answered Feb 19 '10 at 11:48

0

use gettimeofday , it has microseconds resolution. System.nanoTime() in Java is commonly implemented using gettimeofday on *nixes

answered Feb 19 '10 at 11:48

nos

Caution; gettimeofday may reports a value in microseconds, but the actual resolution is platform dependent. It is not updated at that rate. – Clifford Feb 19 '10 at 11:55

2 Answers2