Expose global snapshot funcs for (user-defined) 2PC on coordinator.

arssher · arssher · commit 305e4bd06529 · 2018-10-19T08:47:08.000+03:00
diff --git a/src/backend/access/transam/twophase.c b/src/backend/access/transam/twophase.c
@@ -2548,7 +2548,7 @@ PrepareRedoRemove(TransactionId xid, bool giveWarning)
  * This function is a counterpart of GlobalSnapshotPrepareCurrent() for
  * twophase transactions.
  */
-static GlobalCSN
+GlobalCSN
 GlobalSnapshotPrepareTwophase(const char *gid)
 {
 	GlobalTransaction gxact;
@@ -2619,7 +2619,7 @@ pg_global_snapshot_prepare(PG_FUNCTION_ARGS)
  * This function is a counterpart of GlobalSnapshotAssignCsnCurrent() for
  * twophase transactions.
  */
-static void
+void
 GlobalSnapshotAssignCsnTwoPhase(const char *gid, GlobalCSN global_csn)
 {
 	GlobalTransaction gxact;
diff --git a/src/include/access/twophase.h b/src/include/access/twophase.h
@@ -61,4 +61,9 @@ extern void PrepareRedoAdd(char *buf, XLogRecPtr start_lsn,
 			   XLogRecPtr end_lsn, RepOriginId origin_id);
 extern void PrepareRedoRemove(TransactionId xid, bool giveWarning);
 extern void restoreTwoPhaseData(void);
+
+/* Global snapshots support for 2PC on coordinator */
+extern GlobalCSN GlobalSnapshotPrepareTwophase(const char *gid);
+extern void GlobalSnapshotAssignCsnTwoPhase(const char *gid, GlobalCSN global_csn);
+
 #endif							/* TWOPHASE_H */
