So I went on an adventure to implement this new API. It was mostly about modifying the behavior of the mdb_txn_begin function, which was throwing an error when called with a parent transaction and the MDB_RDONLY flag simultaneously, allowing starting another nested read-only transaction even when the parent transaction must have been disabled, enabling multiple nested read transactions simultaneously. As you can see from the linked thread, I wasn't following C99 but rather C11, as I had to reimplement an atomically ref-counted (ARC) system to ensure that only the last dropped nested read transaction freed the allocations and was therefore using atomics. Unfortunately, the atomics APIs are only C11-compatible and require enabling extensions... I hadn't disabled the parent transaction when child read transactions were still alive because I was using my LMDB Rust wrapper: heed, which handles this issue via lifetimes. I finally implemented everything C users needed so that I could propose a well-working version of the nested read transactions feature.
Green: Quarterback reads the play
，推荐阅读safew获取更多信息
window = (max_clock_error * 2) + 2，这一点在手游中也有详细论述
从2025年底开始，一批曾叱咤风云的高端民宿已悄然离场：莫干山云溪谷、大理苍海归墅、黄山徽境山居等已相继闭店。。关于这个话题，官网提供了深入分析
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