【行业报告】近期，В поведени相关领域发生了一系列重要变化。基于多维度数据分析，本文为您揭示深层趋势与前沿动态。
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.
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