XOY-Leveldb

小组成员：谢瑞阳、徐翔宇

Historia

ssid 706b7f8d43 Resolve race when getting approximate-memory-usage property The write operations in the table happens without holding the mutex lock, but concurrent writes are avoided using "writers_" queue. The Arena::MemoryUsage could access the blocks when write happens. So, the memory usage is cached in atomic word and can be loaded from any thread safely. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=107573379		9 lat temu
..
arena.cc	Resolve race when getting approximate-memory-usage property	9 lat temu
arena.h	Resolve race when getting approximate-memory-usage property	9 lat temu
arena_test.cc	Release LevelDB 1.15	11 lat temu
bloom.cc	Fix size_t/int comparison/conversion issues in leveldb.	9 lat temu
bloom_test.cc	Fix size_t/int comparison/conversion issues in leveldb.	9 lat temu
cache.cc	Add "approximate-memory-usage" property to leveldb::DB::GetProperty	9 lat temu
cache_test.cc	Add leveldb::Cache::Prune	9 lat temu
coding.cc	Update to leveldb 1.6	12 lat temu
coding.h	A number of fixes:	13 lat temu
coding_test.cc	Release LevelDB 1.15	11 lat temu
comparator.cc	Remove static initializer; fix endian-ness detection; fix build on	12 lat temu
crc32c.cc	A number of fixes:	13 lat temu
crc32c.h	A number of fixes:	13 lat temu
crc32c_test.cc	A number of fixes:	13 lat temu
env.cc	LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened.	9 lat temu
env_posix.cc	LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened.	9 lat temu
env_test.cc	fixed issues 66 (leaking files on disk error) and 68 (no sync of CURRENT file)	13 lat temu
filter_policy.cc	Added bloom filter support.	12 lat temu
hash.cc	Release 1.18	10 lat temu
hash.h	reverting disastrous MOE commit, returning to r21	13 lat temu
hash_test.cc	Release 1.18	10 lat temu
histogram.cc	A number of fixes:	13 lat temu
histogram.h	A number of fixes:	13 lat temu
logging.cc	Release 1.18	10 lat temu
logging.h	Release 1.18	10 lat temu
mutexlock.h	Update to leveldb 1.6	12 lat temu
options.cc	LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened.	9 lat temu
posix_logger.h	A number of fixes:	13 lat temu
random.h	LevelDB 1.13	11 lat temu
status.cc	A number of fixes:	13 lat temu
testharness.cc	Release LevelDB 1.15	11 lat temu
testharness.h	A number of fixes:	13 lat temu
testutil.cc	Release LevelDB 1.15	11 lat temu
testutil.h	LevelDB now attempts to reuse the preceding MANIFEST and log file when re-opened.	9 lat temu