#include <db_cxx.h>

int
DbEnv::set_feedback(
    void (*db_feedback_fcn)(DbEnv *, int opcode, int pct));

Description

Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The DbEnv::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 method. This method must be declared with three arguments: the first will be a reference to the enclosing environment, the second a flag value, and the third the percent of the operation that has been completed, specified as an integer value between 0 and 100. It is up to the callback method to display this information in an appropriate manner.

The opcode argument may take on any of the following values:

DB_RECOVER

The environment is being recovered.

The DbEnv::set_feedback interface may be called at any time during the life of the application.

The DbEnv::set_feedback 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.

Class

See Also