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<!--$Id: env_cdsgroup_begin.so,v 1.3 2008/04/09 20:31:41 sarette Exp $--> <!--Copyright (c) 1997,2008 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DbEnv::cdsgroup_begin</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>DbEnv::cdsgroup_begin</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 DbEnv::cdsgroup_begin(DbTxn **tid); </pre></b> <hr size=1 noshade> <b>Description: DbEnv::cdsgroup_begin</b> <a name="2"><!--meow--></a> <p>The DbEnv::cdsgroup_begin method allocates a locker ID in an environment configured for Berkeley DB Concurrent Data Store applications. It copies a pointer to a <a href="../../db4-devel-4.7.25/api_cxx/txn_class.html">DbTxn</a> that uniquely identifies the locker ID into the memory to which <b>tid</b> refers. Calling the <a href="../../db4-devel-4.7.25/api_cxx/txn_commit.html">DbTxn::commit</a> method will discard the allocated locker ID.</p> <p>See <a href="../../db4-devel-4.7.25/ref/cam/intro.html">Berkeley DB Concurrent Data Store applications</a> for more information about when this is required.</p> <p>The DbEnv::cdsgroup_begin method may be called at any time during the life of the application.</p> <p>The DbEnv::cdsgroup_begin 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> <br><b>Errors</b> <p>If the maximum number of lockers has been reached, the DbEnv::cdsgroup_begin method will fail and either return ENOMEM or throw a DbMemoryException.</p> <hr size=1 noshade> <br><b>Class</b> <a href="../../db4-devel-4.7.25/api_cxx/env_class.html">DbEnv</a>, <a href="../../db4-devel-4.7.25/api_cxx/txn_class.html">DbTxn</a> <br><b>See Also</b> <a href="../../db4-devel-4.7.25/api_cxx/txn_list.html">Transaction Subsystem 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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