From 2a808655928d798e5d884ec5b70568a4ce07665e Mon Sep 17 00:00:00 2001
From: bdemsky <bdemsky>
Date: Thu, 22 Mar 2007 23:56:41 +0000
Subject: [PATCH] notes

---
 Robust/src/Runtime/DSTM/docs/commitnotes | 49 ++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Robust/src/Runtime/DSTM/docs/commitnotes

diff --git a/Robust/src/Runtime/DSTM/docs/commitnotes b/Robust/src/Runtime/DSTM/docs/commitnotes
new file mode 100644
index 00000000..3734d367
--- /dev/null
+++ b/Robust/src/Runtime/DSTM/docs/commitnotes
@@ -0,0 +1,49 @@
+Per object possibilities:
+
+1) Lock acquired, version id matches
+
+2) No lock, but version id matches
+
+3) Version id doesn't match
+
+4) Not here
+
+Response to machine running transaction
+
+A) DISAGREE (if we ever see at least 1 #3)
+
+B) AGREE (all #1)
+
+C) AGREE BUT MISSING OBJECTS (mixture of #1 and #4 - no #2 or #3) -
+return list of oid's for missing objects (need to build list)
+
+D) SOFT ABORT (need #2, could have #1, #4, can't have #3) - make sure
+there are no #3's
+
+Machine running transaction
+
+I) ABORT (Any A's) (rerun computation, clear out transaction records, etc...)
+
+II) COMMIT (All B's)
+
+III) ABORT BUT RETRY COMMIT (don't rerun computation) (Need D, can
+have B's, can have C', no A's)
+
+IV) ABORT BUT RETRY COMMIT WITH RELOCATING (don't rerun computation,
+but relookup all missing objects) (Need C, can have B's, no A's, no
+D's)
+
+
+Other machine involved in transaction
+
+I) COMMIT - commit object into store
+
+II) ABORT - unlock objects, free transaction resources
+
+III) Transaction machine unreachable...
+
+	If any machine in transaction has seen COMMIT, all COMMIT
+(Need to communicate this information in advanced of deciding
+COMMIT/ABORT)
+
+	If no one has seen COMMIT, all ABORT
\ No newline at end of file
-- 
2.34.1