review (XS) for 7033779: CodeCache::largest_free_block may need to hold the CodeCache lock

[Vladimir Kozlov]

Looks good. Thank you for fixing this.

Vladimir

Tom Rodriguez wrote:
> http://cr.openjdk.java.net/~never/7033779
> 
> 7033779: CodeCache::largest_free_block may need to hold the CodeCache lock
> Reviewed-by:
> 
> CodeCache::largest_free_block may be called without the CodeCache_lock
> being held which might result in crashes when the free list is being
> updated.  The changes for 7025742 are the primary culprit but there
> are other places where this was being done.  The fix is to acquire the
> lock when needed.  I wasn't able to directly reproduce the original
> crash so I just tested it by running the JVM a bit to make sure the
> calls to largest_free_block continued to work correctly in both
> contexts.
>