#define SQLITE_SHM_NLOCK 8
The xShmLock method on sqlite3_io_methods may use values between 0 and this upper bound as its "offset" argument. The SQLite core will never attempt to acquire or release a lock outside of this range
See also lists of Objects, Constants, and Functions.
SQLite is in the Public Domain.
https://sqlite.org/c3ref/c_shm_nlock.html