Berkeley DB: DB_ENV->set_lk

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Berkeley DB: DB_ENV->set_lk_conflicts

DB_ENV->set_lk_conflicts

#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); Description: DB_ENV->set_lk_conflicts 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 conflictsThe 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. nmodesThe 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: EINVALIf the method was called after DB_ENV->open was called; or if an invalid flag value or parameter was specified. ENOMEMThe conflicts array could not be copied. Description: dbenv_get_lk_conflicts 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. Parameters lk_conflictspThe lk_conflictsp parameter references memory into which a pointer to the current conflicts array is copied. lk_modespThe lk_modesp parameter references memory into which the size of the current conflicts array is copied. Class DB_ENV, DB_LOCK See Also Locking Subsystem and Related Methods