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<!--$Id: db_set_feedback.so,v 10.29 2003/10/19 01:27:11 bostic Exp $--> <!--$Id: env_set_feedback.so,v 10.43 2006/05/17 20:47:46 bostic Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: Db::set_feedback</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <b>Db::set_feedback</b> </td> <td align=right> <a href="../../db4-devel-4.7.25/api_cxx/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a> <a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <b><pre> #include <db_cxx.h> <p> int Db::set_feedback(void (*db_feedback_fcn)(DB *dbp, int opcode, int percent)); </pre></b> <hr size=1 noshade> <b>Description: Db::set_feedback</b> <p>Some operations performed by the Berkeley DB library can take non-trivial amounts of time. The Db::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.</p> <p>It is up to the callback function to display this information in an appropriate manner.</p> <p>The Db::set_feedback method may be called at any time during the life of the application.</p> <p>The Db::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. </p> <b>Parameters</b> <br> <b>db_feedback_fcn</b><ul compact><li>The <b>db_feedback_fcn</b> parameter is the application-specified feedback function called to report Berkeley DB operation progress. The callback function must take three parameters: <br> <b><b>db</b></b><ul compact><li>The <b>db</b> parameter is a reference to the enclosing database.</ul> <b><b>opcode</b></b><ul compact><li>The <b>opcode</b> parameter is an operation code. The <b>opcode</b> parameter may take on any of the following values: <br> <b><a name="DB_UPGRADE">DB_UPGRADE</a></b><ul compact><li>The underlying database is being upgraded.</ul> <b><a name="DB_VERIFY">DB_VERIFY</a></b><ul compact><li>The underlying database is being verified.</ul> <br></ul> <b><b>percent</b></b><ul compact><li>The <b>percent</b> parameter is the percent of the operation that has been completed, specified as an integer value between 0 and 100.</ul> <br></ul> <p>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.</p> <br> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_cxx/db_class.html">Db</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_cxx/db_list.html">Databases and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db4-devel-4.7.25/api_cxx/api_core.html"><img src="../../db4-devel-4.7.25/images/api.gif" alt="API"></a><a href="../../db4-devel-4.7.25/ref/toc.html"><img src="../../db4-devel-4.7.25/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font> </body> </html>
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