leveldb_ttl

atdalīts no building_data_management_systems.Xuanzhou.2024Fall.DaSE/leveldb_base

作者：韩晨旭 10225101440 李畅 10225102463

costan 739c25100e Add CMake build support. Fixes https://github.com/google/leveldb/issues/466 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=189425354		pirms 7 gadiem
..
memenv.cc	Extend thread safety annotations.	pirms 7 gadiem
memenv.h	Add CMake build support.	pirms 7 gadiem
memenv_test.cc	LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened.	pirms 9 gadiem