DB_ENV->set_lk_conflicts()
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## 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

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