rdar://problem/11320188

Designate MachThreadList as a transaction coordinator when doing Enable/DisableHardwareWatchpoint on the list of threads.
In case the operation (iterating on the threads and doing enable/disable) fails in the middle, we rollback the already
enabled/disabled threads to their checkpointed states.  When all the threads succeed in enable/disable, we ask each thread
to finsih the transaction and commit the change of the debug state.

llvm-svn: 157858

1 files changed, 2 insertions, 0 deletions

diff --git a/lldb/tools/debugserver/source/MacOSX/MachThread.h b/lldb/tools/debugserver/source/MacOSX/MachThread.h
index 724043ab039..90bd05f2dc7 100644
--- a/lldb/tools/debugserver/source/MacOSX/MachThread.h
+++ b/lldb/tools/debugserver/source/MacOSX/MachThread.h
@@ -66,6 +66,8 @@ public:
     bool            DisableHardwareBreakpoint (const DNBBreakpoint *breakpoint);
     bool            DisableHardwareWatchpoint (const DNBBreakpoint *watchpoint);
     uint32_t        NumSupportedHardwareWatchpoints () const;
+    bool            RollbackTransForHWP();
+    bool            FinishTransForHWP();
 
     nub_state_t     GetState();
     void            SetState(nub_state_t state);