DB_ENV->set_lk_conflicts()

#include <db.h>

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

Set the locking conflicts matrix.

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() method may not be called after the DB_ENV->open() method 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.

Parameters

conflicts

The conflicts parameter is the new locking conflicts matrix. The conflicts parameter 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.

nmodes

The nmodes parameter is the size of the lock conflicts matrix.

Errors

The DB_ENV->set_lk_conflicts() method may fail and return one of the following non-zero errors:

EINVAL

If the method was called after DB_ENV->open() was called; or if an invalid flag value or parameter was specified.

ENOMEM

The conflicts array could not be copied.

Class

DB_ENV, DB_LOCK

See Also

Locking Subsystem and Related Methods