60 lines
2.5 KiB
HTML
60 lines
2.5 KiB
HTML
<!--$Id: env_cdsgroup_begin.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB: DbEnv::cdsgroup_begin</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++">
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</head>
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<body bgcolor=white>
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<table width="100%"><tr valign=top>
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<td>
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<b>DbEnv::cdsgroup_begin</b>
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</td>
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<td align=right>
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<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><pre>
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#include <db_cxx.h>
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<p>
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int
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DbEnv::cdsgroup_begin(DbTxn **tid);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DbEnv::cdsgroup_begin</b>
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<a name="2"><!--meow--></a>
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<p>The DbEnv::cdsgroup_begin method allocates a locker ID in an
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environment configured for Berkeley DB Concurrent Data Store applications. It copies a pointer to
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a <a href="../api_cxx/txn_class.html">DbTxn</a> that uniquely identifies the locker ID into the memory
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to which <b>tid</b> refers. Calling the <a href="../api_cxx/txn_commit.html">DbTxn::commit</a> method will
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discard the allocated locker ID.</p>
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<p>See <a href="../ref/cam/intro.html">Berkeley DB Concurrent Data Store applications</a> for more
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information about when this is required.</p>
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<p>The DbEnv::cdsgroup_begin method may be called at any time during the life of the
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application.</p>
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<p>The DbEnv::cdsgroup_begin method
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either returns a non-zero error value
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or throws an exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</p>
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<br><b>Errors</b>
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<p>If the maximum number of lockers has been reached, the DbEnv::cdsgroup_begin method will fail and
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either return ENOMEM or
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throw a DbMemoryException.</p>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
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<br><b>See Also</b>
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<a href="../api_cxx/txn_list.html">Transaction Subsystem and Related Methods</a>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_cxx/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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</body>
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</html>
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