From 55142d8d6f3a1b5649241872da6af4a9ec7f00cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Tue, 21 Nov 2023 15:17:07 +0300
Subject: [PATCH] =?UTF-8?q?mdbx++:=20=D0=B4=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB?=
 =?UTF-8?q?=D0=B5=D0=BD=D0=B8=D0=B5=20`txn::commit=5Fembark=5Fread()`.?=
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---
 mdbx.h++     | 4 ++++
 src/mdbx.c++ | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/mdbx.h++ b/mdbx.h++
index e8614e41..27df86de 100644
--- a/mdbx.h++
+++ b/mdbx.h++
@@ -4318,6 +4318,10 @@ public:
   /// \brief Commit all the operations of a transaction into the database.
   void commit();
 
+  /// \brief Commit all the operations of a transaction into the database
+  /// and then start read transaction.
+  void commit_embark_read();
+
   using commit_latency = MDBX_commit_latency;
 
   /// \brief Commit all the operations of a transaction into the database
diff --git a/src/mdbx.c++ b/src/mdbx.c++
index 4381b8e8..621c2695 100644
--- a/src/mdbx.c++
+++ b/src/mdbx.c++
@@ -1555,6 +1555,13 @@ void txn_managed::commit(commit_latency *latency) {
     MDBX_CXX20_UNLIKELY err.throw_exception();
 }
 
+void txn_managed::commit_embark_read() {
+  auto env = this->env();
+  commit();
+  error::success_or_throw(
+      ::mdbx_txn_begin(env, nullptr, MDBX_TXN_RDONLY, &handle_));
+}
+
 //------------------------------------------------------------------------------
 
 bool txn::drop_map(const char *name, bool throw_if_absent) {