0.12.1 "Positive Proxima" The planned frontward release with new superior features on the day of 20 anniversary of [Positive Technologies](https://ptsecurty.com). New: --- - The `Big Foot` feature which significantly reduces GC overhead for processing large lists of retired pages from huge transactions. Now _libmdbx_ avoid creating large chunks of PNLs (page number lists) which required a long sequences of free pages, aka large/overflow pages. Thus avoiding searching, allocating and storing such sequences inside GC. - Improved hot/online validation and checking of database pages both for more robustness and performance. - New solid and fast method to latch meta-pages called `Troika`. The minimum of memory barriers, reads, comparisons and conditional transitions are used. - New `MDBX_VALIDATION` environment options to extra validation of DB structure and pages content for carefully/safe handling damaged or untrusted DB. - Accelerated ×16/×8/×4 by AVX512/AVX2/SSE2/Neon implementations of search page sequences. - Added the `gcrtime_seconds16dot16` counter to the "Page Operation Statistics" that accumulates time spent for GC searching and reclaiming. - Copy-with-compactification now clears/zeroes unused gaps inside database pages. - The `C` and `C++` APIs has been extended and/or refined to simplify using `wchar_t` pathnames. On Windows the `mdbx_env_openW()`, `mdbx_env_get_pathW()`, `mdbx_env_copyW()`, `mdbx_env_open_for_recoveryW()` are available for now, but the `mdbx_env_get_path()` has been replaced in favor of `mdbx_env_get_pathW()`. - Added explicit error message for Buildroot's Microblaze toolchain maintainers. - Added `MDBX_MANAGE_BUILD_FLAGS` build options for CMake. - Speed-up internal `bsearch`/`lower_bound` implementation using branchless tactic, including workaround for CLANG x86 optimiser bug. - A lot internal refinement and micro-optimisations. - Internally counted volume of dirty pages (unused for now but for coming features). Fixes: ----- - Never use modern `__cxa_thread_atexit()` on Apple's OSes. - Don't check owner for finished transactions. - Fixed typo in `MDBX_EINVAL` which breaks MingGW builds with CLANG. For earlier versions please refer to the git's tags and the [ChangeLog](https://gitflic.ru/project/erthink/libmdbx/blob?file=ChangeLog.md). 37 files changed, 7604 insertions(+), 7417 deletions(-) Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
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