From f7507110ef8efa0184a30acb872a7e2ac9c23782 Mon Sep 17 00:00:00 2001
From: Leo Yuriev <leo@yuriev.ru>
Date: Mon, 24 Apr 2017 14:13:52 +0300
Subject: [PATCH] mdbx: alter mdbx_txn_id() API.

---
 src/mdbx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index cfca3b5a..0a5d0d24 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -2409,7 +2409,7 @@ MDB_env *mdbx_txn_env(MDB_txn *txn) {
 
 size_t mdbx_txn_id(MDB_txn *txn) {
   if (unlikely(!txn || txn->mt_signature != MDBX_MT_SIGNATURE))
-    return 0;
+    return ~(txnid_t)0;
   return txn->mt_txnid;
 }