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
diff --git a/src/oat/runtime/mips/runtime_support_mips.S b/src/oat/runtime/mips/runtime_support_mips.S
index ec9d269..6946825 100644
--- a/src/oat/runtime/mips/runtime_support_mips.S
+++ b/src/oat/runtime/mips/runtime_support_mips.S
@@ -787,7 +787,7 @@
*/
ALIGN_FUNCTION_ENTRY
art_test_suspend:
- lw $a0, THREAD_SUSPEND_COUNT_OFFSET(rSELF)
+ lh $a0, THREAD_FLAGS_OFFSET(rSELF)
bnez $a0, 1f
addi rSUSPEND, $zero, SUSPEND_CHECK_INTERVAL # reset rSUSPEND to SUSPEND_CHECK_INTERVAL
jr $ra