kDBLockFile (reference) in projects: rocksdb-6.9

42         {"LOCK", 0, kDBLockFile, kAllMode},  in TEST_F()
139   ASSERT_EQ(kDBLockFile, type);  in TEST_F()

271     *type = kDBLockFile;  in ParseFileName()

3553           type != kDBLockFile) {  // Lock file will be deleted at end  in DestroyDB()

/rocksdb-6.9/db/
D	filename_test.cc	`42 {"LOCK", 0, kDBLockFile, kAllMode}, in TEST_F() 139 ASSERT_EQ(kDBLockFile, type); in TEST_F()`
/rocksdb-6.9/file/
D	filename.h	`40 kDBLockFile, enumerator`
D	filename.cc	`271 *type = kDBLockFile; in ParseFileName()`
/rocksdb-6.9/db/db_impl/
D	db_impl_files.cc	`451 case kDBLockFile: in PurgeObsoleteFiles()`
D	db_impl.cc	`3553 type != kDBLockFile) { // Lock file will be deleted at end in DestroyDB()`