Play with snapshots...

knizhnik · knizhnik · commit 7adf6f0bb2b8 · 2015-09-09T19:39:16.000+03:00
diff --git a/contrib/pg_xtm/pg_dtm.c b/contrib/pg_xtm/pg_dtm.c
@@ -62,7 +62,7 @@ extern SnapshotData CatalogSnapshotData;
 
 static Snapshot DtmGetSnapshot(Snapshot snapshot)
 {
-    if (DtmHasSnapshot/* && snapshot != &CatalogSnapshotData*/) { 
+    if (DtmHasSnapshot && snapshot->satisfies == HeapTupleSatisfiesMVCC) { 
         return &DtmSnapshot;
     }
     return GetLocalSnapshotData(snapshot);
diff --git a/contrib/pg_xtm/tests/transfers.go b/contrib/pg_xtm/tests/transfers.go
@@ -163,6 +163,9 @@ func total() int32 {
         // register global transaction in DTMD
         exec(conn1, "select dtm_global_transaction($1, $2)", nodes, xids)
 
+        exec(conn1, "select dtm_get_snapshot()")
+        exec(conn2, "select dtm_get_snapshot()")
+
         sum1 = execQuery(conn1, "select sum(v) from t")
         sum2 = execQuery(conn2, "select sum(v) from t")
 

Original file line number	Diff line number	Diff line change
`@@ -62,7 +62,7 @@ extern SnapshotData CatalogSnapshotData;`
`62`	`62`
`63`	`63`	`static Snapshot DtmGetSnapshot(Snapshot snapshot)`
`64`	`64`	`{`
`65`		`- if (DtmHasSnapshot/* && snapshot != &CatalogSnapshotData*/) {`
	`65`	`+ if (DtmHasSnapshot && snapshot->satisfies == HeapTupleSatisfiesMVCC) {`
`66`	`66`	`return &DtmSnapshot;`
`67`	`67`	`}`
`68`	`68`	`return GetLocalSnapshotData(snapshot);`