RFR 8157318: ThreadedSeedGenerator uses System.currentTimeMillis and stops generating when time is set back

[Xuelei Fan]

I'm not sure I understand the while loop.  But this update looks fine to
me as it does not change the logic of the code except to use elapsed time.

Xuelei

On 6/15/2016 11:12 AM, Wang Weijun wrote:
> Please take a review on the patch
> 
> diff --git a/src/java.base/share/classes/sun/security/provider/SeedGenerator.java b/src/java.base/share/classes/sun/security/provider/SeedGenerator.java
> --- a/src/java.base/share/classes/sun/security/provider/SeedGenerator.java
> +++ b/src/java.base/share/classes/sun/security/provider/SeedGenerator.java
> @@ -354,8 +354,8 @@
>                          // We wait 250milli quanta, so the minimum wait time
>                          // cannot be under 250milli.
>                          int latch = 0;
> -                        long l = System.currentTimeMillis() + 250;
> -                        while (System.currentTimeMillis() < l) {
> +                        long l = System.nanoTime() + 250000000;
> +                        while (System.nanoTime() < l) {
>                              synchronized(this){};
>                              latch++;
>                          }
> 
> nanoTime() is for elapsed time and should be used here.
> 
> Thanks
> Max
>