#include <db.h>

int
DB_ENV->set_lk_conflicts(DB_ENV *dbenv,
    u_int8_t *conflicts, int nmodes);

Description

Set the locking conflicts matrix. The conflicts argument is an nmodes by nmodes array. A non-0 value for the array element indicates that requested_mode and held_mode conflict:

conflicts[requested_mode][held_mode]

The not-granted mode must be represented by 0.

If DB_ENV->set_lk_conflicts is never called, a standard conflicts array is used; see Standard Lock Modes for more information.

The DB_ENV->set_lk_conflicts method configures a database environment, not only operations performed using the specified DB_ENV handle.

The DB_ENV->set_lk_conflicts interface may not be called after the DB_ENV->open interface is called. If the database environment already exists when DB_ENV->open is called, the information specified to DB_ENV->set_lk_conflicts will be ignored.

The DB_ENV->set_lk_conflicts method returns a non-zero error value on failure and 0 on success.

Errors

The DB_ENV->set_lk_conflicts method may fail and return a non-zero error for the following conditions:

EINVAL

An invalid flag value or parameter was specified.

Called after DB_ENV->open was called.

ENOMEM

No memory was available to copy the conflicts array.

The DB_ENV->set_lk_conflicts method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_ENV->set_lk_conflicts method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

See Also