# DbEnv::set_lk_conflicts

`

###

    #include <db_cxx.h>

    int
    DbEnv::set_lk_conflicts(u_int8_t *lk_conflicts, int lk_nmodes);

# Description

Set the locking conflicts matrix. The lk_conflicts argument is an lk_nmodes by lk_nmodes array. A non-0 value for the array element:

>     lk_conflicts[requested_mode][held_mode]

indicates that requested_mode and held_mode conflict. The not-granted mode must be represented by 0.

If no lk_conflicts value is specified, the conflicts array db_rw_conflicts is used; see Standard Lock Modes for a description of that array.

The DbEnv::set_lk_conflicts interface may only be used to configure Berkeley DB before the DbEnv::open interface is called.

The DbEnv::set_lk_conflicts method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DbEnv::open was called.

ENOMEM
  No memory was available to copy the conflicts array.

### Classes

DbEnv, DbLock

# See Also

DbEnv::set_lk_conflicts, DbEnv::set_lk_detect, DbEnv::set_lk_max, DbEnv::lock_detect, DbEnv::lock_get, DbEnv::lock_id, DbLock::put, DbEnv::lock_stat and DbEnv::lock_vec.`

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