Berkeley DB: DbEnv::set_lk_conflicts
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DbEnv::set_lk_conflicts |

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    #include <db_cxx.h>

    int
    DbEnv::set_lk_conflicts(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 DbEnv::set_lk_conflicts is never called, a standard conflicts array is used; see Standard Lock Modes for more information.

The DbEnv::set_lk_conflicts interface may be used only 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

The DbEnv::set_lk_conflicts method may fail and throw an exception or return a non-zero error for the following conditions:

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.

The DbEnv::set_lk_conflicts method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv::set_lk_conflicts method may fail and either return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# Class

DbEnv, DbLock

# See Also

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

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