SQLITE_LOCK_NONE(3) Library Functions Manual SQLITE_LOCK_NONE(3)

SQLITE_LOCK_NONE, SQLITE_LOCK_SHARED, SQLITE_LOCK_RESERVED, SQLITE_LOCK_PENDING, SQLITE_LOCK_EXCLUSIVE
File Locking Levels

#define SQLITE_LOCK_NONE
#define SQLITE_LOCK_SHARED
#define SQLITE_LOCK_RESERVED
#define SQLITE_LOCK_PENDING
#define SQLITE_LOCK_EXCLUSIVE

SQLite uses one of these integer values as the second argument to calls it makes to the xLock() and xUnlock() methods of an sqlite3_io_methods object.

sqlite3_io_methods(3)
December 19, 2018 NetBSD 9.2