<!--$Id: env_set_feedback.so,v 10.43 2006/05/17 20:47:46 bostic Exp $--> <!--Copyright (c) 1997,2007 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->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> <h3>DB_ENV->set_feedback</h3> </td> <td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a> <a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> int DB_ENV->set_feedback(DB_ENV *dbenv, void (*db_feedback_fcn)(DB_ENV *dbenv, int opcode, int percent)); </pre></h3> <hr size=1 noshade> <h3>Description: DB_ENV->set_feedback</h3> <p>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.</p> <p>It is up to the callback function to display this information in an appropriate manner.</p> <p>The DB_ENV->set_feedback method configures operations performed using the specified <a href="../../db46-devel-4.6.21/api_c/env_class.html">DB_ENV</a> handle <p>The DB_ENV->set_feedback method may be called at any time during the life of the application.</p> <p>The DB_ENV->set_feedback method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <dl compact> <dt><b>db_feedback_fcn</b><dd>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: <dl compact> <dt><b>dbenv</b><dd>The <b>dbenv</b> parameter is a reference to the enclosing database environment. <dt><b>opcode</b><dd>The <b>opcode</b> parameter is an operation code. The <b>opcode</b> parameter may take on any of the following values: <dl compact> <dt><a name="DB_RECOVER">DB_RECOVER</a><dd>The environment is being recovered. </dl> <dt><b>percent</b><dd>The <b>percent</b> parameter is the percent of the operation that has been completed, specified as an integer value between 0 and 100. </dl> <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> </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db46-devel-4.6.21/api_c/env_class.html">DB_ENV</a> <h3>See Also</h3> <a href="../../db46-devel-4.6.21/api_c/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a><a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2007 Oracle. All rights reserved.</font> </body> </html>