mdbx: add mdbx_txn_abort_ex() to API (v0.14.1-363-g75544794).

2026-01-30 mdbx: commit child/nested transactions inside `txn_checkpoint()`.
2026-01-29 mdbx++: minor reformat C++ API.
2026-01-29 mdbx: fix overlapping of internal `txn_gc_drained` and `MDBX_TXN_OUSTED`.
2026-01-29 mdbx: add `mdbx_txn_abort_ex()` to API.
2026-01-29 mdbx: refine nested ro-txns and `MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS`.
2026-01-29 mdbx-doc: translate build-options descriptions.
2026-01-29 mdbx: fix getting GC-profiling info.

Author: erthink

CMakeLists.txt

@@ -514,6 +514,8 @@ add_option(MDBX ENABLE_DBI_SPARSE
 add_option(MDBX ENABLE_DBI_LOCKFREE "Support for deferred releasing and a lockfree path to quickly open DBI handles" ON)
 add_option(MDBX USE_FALLOCATE "Using posix_fallocate() or fcntl(F_PREALLOCATE) on OSX" AUTO)
 mark_as_advanced(MDBX_USE_FALLOCATE)
+add_option(MDBX ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS "Enables fake nested read-only transactions, which are much cheaper but do not restore the state of cursors in case of transaction abortion." OFF)
+mark_as_advanced(MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS)
 
 if((MDBX_BUILD_TOOLS OR MDBX_ENABLE_TESTS) AND MDBX_BUILD_SHARED_LIBRARY)
   add_option(MDBX LINK_TOOLS_NONSTATIC "Link MDBX tools with non-static libmdbx" OFF)

VERSION.json

@@ -1 +1 @@
-{ "git_describe": "v0.14.1-356-gadaf1352", "git_timestamp": "2026-01-29T18:08:07+03:00", "git_tree": "246a9ed8d7ad2d018c9bb365d96efd954af8debd", "git_commit": "adaf135226e1d53dd5cf49e1cba09eea202b32b2", "semver": "0.14.1.356" }
+{ "git_describe": "v0.14.1-363-g75544794", "git_timestamp": "2026-01-31T11:23:34+03:00", "git_tree": "03c64f73e55c62cf461069533a78cfec0349c509", "git_commit": "75544794b936cbaf58e82234b924c8c1fad857d2", "semver": "0.14.1.363" }

config.h.in

@@ -1,4 +1,4 @@
-/* This file is part of the libmdbx amalgamated source code (v0.14.1-356-gadaf1352 at 2026-01-29T18:08:07+03:00),
+/* This file is part of the libmdbx amalgamated source code (v0.14.1-363-g75544794 at 2026-01-31T11:23:34+03:00),
  * it is the template for libmdbx's config.h
  ******************************************************************************/
 
@@ -40,6 +40,7 @@
 #cmakedefine01 MDBX_ENABLE_PROFGC
 #cmakedefine01 MDBX_ENABLE_DBI_SPARSE
 #cmakedefine01 MDBX_ENABLE_DBI_LOCKFREE
+#cmakedefine01 MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS
 
 /* Windows */
 /* allowing override MDBX_WITHOUT_MSVC_CRT=ON to build the C++ API in "private" mode only for tests */

mdbx-internals.h

@@ -1,4 +1,4 @@
-/* This file is part of the libmdbx amalgamated source code (v0.14.1-356-gadaf1352 at 2026-01-29T18:08:07+03:00).
+/* This file is part of the libmdbx amalgamated source code (v0.14.1-363-g75544794 at 2026-01-31T11:23:34+03:00).
  *
  * libmdbx (aka MDBX) is an extremely fast, compact, powerful, embeddedable, transactional key-value storage engine with
  * open-source code. MDBX has a specific set of properties and capabilities, focused on creating unique lightweight
@@ -24,7 +24,7 @@
 
 #define xMDBX_ALLOY 1  /* alloyed build */
 
-#define MDBX_BUILD_SOURCERY c7d0809cdcee9e26880a00d4c8070c99148713f0b923a83d9c16293e4bf05be8_v0_14_1_356_gadaf1352
+#define MDBX_BUILD_SOURCERY 090f5ce3ec346115a6141ff67f0c5abb45476c091e6bd6a98a9e3f5a6cb0b113_v0_14_1_363_g75544794
 
 #define LIBMDBX_INTERNALS
 #define MDBX_DEPRECATED
@@ -1795,8 +1795,9 @@ MDBX_MAYBE_UNUSED MDBX_NOTHROW_PURE_FUNCTION static inline uint32_t osal_bswap32
 #error MDBX_DPL_PREALLOC_FOR_RADIXSORT must be defined as 0 or 1
 #endif /* MDBX_DPL_PREALLOC_FOR_RADIXSORT */
 
-/** Controls dirty pages tracking, spilling and persisting in `MDBX_WRITEMAP`
- * mode, i.e. disables in-memory database updating with consequent
+/** Controls dirty pages tracking, spilling and persisting in `MDBX_WRITEMAP`.
+ *
+ * \details In other words, disables in-memory database updating with consequent
  * flush-to-disk/msync syscall.
  *
  * 0/OFF = Don't track dirty pages at all, don't spill ones, and use msync() to
@@ -1816,16 +1817,14 @@ MDBX_MAYBE_UNUSED MDBX_NOTHROW_PURE_FUNCTION static inline uint32_t osal_bswap32
 #error MDBX_AVOID_MSYNC must be defined as 0 or 1
 #endif /* MDBX_AVOID_MSYNC */
 
-/** Управляет механизмом поддержки разреженных наборов DBI-хендлов для снижения
- * накладных расходов при запуске и обработке транзакций. */
+/** Controls a supporting sparse sets of DBI-handles to reduce transaction startup and processing overhead. */
 #ifndef MDBX_ENABLE_DBI_SPARSE
 #define MDBX_ENABLE_DBI_SPARSE 1
 #elif !(MDBX_ENABLE_DBI_SPARSE == 0 || MDBX_ENABLE_DBI_SPARSE == 1)
 #error MDBX_ENABLE_DBI_SPARSE must be defined as 0 or 1
 #endif /* MDBX_ENABLE_DBI_SPARSE */
 
-/** Управляет механизмом отложенного освобождения и поддержки пути быстрого
- * открытия DBI-хендлов без захвата блокировок. */
+/** Controls support of lock-free opening of DBI-handles and deferred destroying ones. */
 #ifndef MDBX_ENABLE_DBI_LOCKFREE
 #define MDBX_ENABLE_DBI_LOCKFREE 1
 #elif !(MDBX_ENABLE_DBI_LOCKFREE == 0 || MDBX_ENABLE_DBI_LOCKFREE == 1)
@@ -1928,6 +1927,14 @@ MDBX_MAYBE_UNUSED MDBX_NOTHROW_PURE_FUNCTION static inline uint32_t osal_bswap32
 #error MDBX_ENABLE_NON_READONLY_EXPORT must be defined as 0 or 1
 #endif /* MDBX_ENABLE_NON_READONLY_EXPORT */
 
+/** Enables fake nested read-only transactions, which are much cheaper but do not restore
+ * the state of cursors in case of transaction abortion. */
+#ifndef MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS
+#define MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS 0
+#elif !(MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS == 0 || MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS == 1)
+#error MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS must be defined as 0 or 1
+#endif /* MDBX_ENABLE_FAKE_NESTED_READONLY_TRANSACTIONS */
+
 //------------------------------------------------------------------------------
 
 /** Win32 File Locking API for \ref MDBX_LOCKING */