iLock            49967 ext/sqlite3/libsqlite/sqlite3.c   int iLock;                      /* Lock offset to lock for checkpoint */
iLock            49980 ext/sqlite3/libsqlite/sqlite3.c   iLock = WAL_ALL_BUT_WRITE + pWal->ckptLock;
iLock            49981 ext/sqlite3/libsqlite/sqlite3.c   nLock = SQLITE_SHM_NLOCK - iLock;
iLock            49982 ext/sqlite3/libsqlite/sqlite3.c   rc = walLockExclusive(pWal, iLock, nLock, 0);
iLock            50122 ext/sqlite3/libsqlite/sqlite3.c   walUnlockExclusive(pWal, iLock, nLock);