Looks like the only synchronization is for lazy initialization of the
instance of Random used by the static method:
public final class Math {
private static Random randomNumberGenerator;
private static synchronized void initRNG() {
if (randomNumberGenerator == null)
randomNumberGenerator = new Random();
}
public static double random() {
if (randomNumberGenerator == null) initRNG();
return randomNumberGenerator.nextDouble();
}
}
public class Random implements java.io.Serializable {
public Random() { this(++seedUniquifier + System.nanoTime()); }
private static volatile long seedUniquifier = 8682522807148012L;
public double nextDouble() {
long l = ((long)(next(26)) << 27) + next(27);
return l / (double)(1L << 53);
}
}
On Dec 2, 12:04 am, Stuart Halloway <[EMAIL PROTECTED]> wrote:
> Clojure's rand delegates to Java's Math.random(), which I am pretty
> sure has a synchronized block in it.
>
> One problem with living on top of Java is calling into methods that
> have no (conceptual) need to be synchronized. This could hurt
> performance in an app carefully written in Clojure to avoid mutable
> state and locking. Since unsynchronized PRNGs exist, I would suggest
> we modify rand to use one. (I am willing to take the lead on writing
> one in Clojure if needed.)
>
> Thoughts?
>
> Stuart
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