Move thread flags and state into 32bits.

We need to ensure that transitions to Runnable are atomic wrt to a
thread modifying the suspend count. Currently this is achieved by
holding the thread_suspend_count_lock_. This change creates a set of bit
flags that summarize that the suspend_count_ is raised and also others
flags that signify the managed code should go into a slow path.

The effect of this change are two-fold:
1) transitions from suspended to runnable can CAS the thread state
rather than holding the suspend_count_lock_. This will make JNI
transitions cheaper.
2) the exception/suspend/interpreter poll needed for shadow frames can
be rolled into a single compare of the bit fields against 0.

Change-Id: I589f84e3dca396c3db448bf32d814565acf3d11f
27 files changed
tree: b67074e7e4c16e01384c2f7d416f4e4ad3b3bd61
  1. .gitignore
  3. build/
  4. jdwpspy/
  5. src/
  6. test/
  7. tools/