#include <db.h>

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

int
DB_ENV->get_lk_conflicts(DB_ENV *dbenv,
    const u_int8_t **lk_conflictsp, int *lk_modesp);

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.

• 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.

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

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

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

• The conflicts array could not be copied.

The DB_ENV->get_lk_conflicts method returns the current conflicts array.

The DB_ENV->get_lk_conflicts method may be called at any time during the life of the application.

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

• The lk_conflictsp parameter references memory into which a pointer to the current conflicts array is copied.

• The lk_modesp parameter references memory into which the size of the current conflicts array is copied.