RFR (S): 8008314 - Unimplemented() Atomic::load breaks the applications

[Jesper Wilhelmsson]

Hi,

Please review the following change:

Webrev: http://cr.openjdk.java.net/~jwilhelm/8008314/

Bug: https://jbs.oracle.com/bugs/browse/JDK-8008314


The use of atomic::add(jlong,jlong*) breaks everything on ARM since it uses 
atomic::load(jlong) which isn't implemented.

The add was used to update a counter in rotating log file handling, but it turns 
out that the counter that was updated doesn't need to be a jlong.

The counter is used to indicate that it is time to do a log file rotation and by 
adding a saftey catch for overflow, we can use an uintx for the counter.

In practice this means that the upper "limit" for the log file size becomes 
UINX_MAX-1 (used to be UINT_MAX) since I change from < to <= in the comparison 
to the limit, but since this is not a hard limit the difference will only be 
noticeable when someone has written UINT_MAX characters to the log file and the 
next write will end up in the next log file part instead of in the same (which 
one could argue is a more correct behavior).

Sine I changed all places where the counter was used I also fixed a typo in its 
name.

Thanks,
/Jesper