#include <db.h>

int
DB_ENV->set_feedback(DB_ENV *dbenv,
    void (*db_feedback_fcn)(DB_ENV *dbenv, int opcode, int percent));

Description: DB_ENV->set_feedback

Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The DB_ENV->set_feedback method can be used by applications to monitor progress within these operations. When an operation is likely to take a long time, Berkeley DB will call the specified callback function with progress information.

It is up to the callback function to display this information in an appropriate manner.

The DB_ENV->set_feedback method configures operations performed using the specified DB_ENV handle

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

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

Parameters

db_feedback_fcn

The db_feedback_fcn parameter is the application-specified feedback function called to report Berkeley DB operation progress. The callback function must take three parameters:

dbenv

The dbenv parameter is a reference to the enclosing database environment.

opcode

The opcode parameter is an operation code. The opcode parameter may take on any of the following values:

DB_RECOVER

The environment is being recovered.

percent

The percent parameter is the percent of the operation that has been completed, specified as an integer value between 0 and 100.

Berkeley DB is not re-entrant. Callback functions should not attempt to make library calls (for example, to release locks or close open handles). Re-entering Berkeley DB is not guaranteed to work correctly, and the results are undefined.

Class

See Also