# DB_ENV->set_lk_conflicts

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    #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 interface may be used only to configure Berkeley DB before the DB_ENV->open interface is called.

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

# Errors

The DB_ENV->set_lk_conflicts function 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 function 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 function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# See Also

DB_ENV->set_lk_conflicts, DB_ENV->set_lk_detect, DB_ENV->set_lk_max, DB_ENV->set_lk_max_lockers, DB_ENV->set_lk_max_locks, DB_ENV->set_lk_max_objects, lock_detect, lock_get, lock_id, lock_put, lock_stat, and lock_vec.`

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