Small. Fast. Reliable.
Choose any three.

## SQLite C Interface

## File Locking Levels

>     #define SQLITE_LOCK_NONE          0
>     #define SQLITE_LOCK_SHARED        1
>     #define SQLITE_LOCK_RESERVED      2
>     #define SQLITE_LOCK_PENDING       3
>     #define SQLITE_LOCK_EXCLUSIVE     4

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.

See also lists of Objects, Constants, and Functions.