Dalvik SMP update
Fix some SMP correctness issues in the VM:
- Correct AtomicCache implementation, inserting barriers where needed
and correcting existing usage.
- Emphasize that String startup isn't expected to be reentrant, and
use atomic ops to ensure that we explode if anybody tries it.
- Use 64-bit quasiatomic ops to manage the "last activity" timer in
JDWP. (Also, provide some documented but unimplemented behavior.)
- Updated the volatile operations in sun.misc.Unsafe to include
appropriate barriers.
(This does not purport to correct all SMP issues, just some of the
more obvious ones.)
Change-Id: I06957ebcf2724fe7a228b30d00194b9b4808fae0
8 files changed