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<title>Berkeley DB Reference Guide: Release 3.0: function arguments</title>
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<td><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></td>
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Release 3.0: function arguments
In Berkeley DB 3.0, there are no longer separate structures that represent
each subsystem (for example, DB_LOCKTAB or DB_TXNMGR), and an overall
<a href="../../api_c/env_class.html">DB_ENV</a> environment structure. Instead there is only the
<a href="../../api_c/env_class.html">DB_ENV</a> structure. This means that <a href="../../api_c/env_class.html">DB_ENV</a> references
should be passed around by your application instead of passing around
DB_LOCKTAB or DB_TXNMGR references.
Each of the following functions:
<blockquote><pre>lock_detect
lock_get
lock_id
lock_put
lock_stat
lock_vec</pre></blockquote>
should have its first argument, a reference to the DB_LOCKTAB structure,
replaced with a reference to the enclosing <a href="../../api_c/env_class.html">DB_ENV</a> structure. For
example, the following line of code from a Berkeley DB 2.X application:
<blockquote><pre>DB_LOCKTAB *lt;
DB_LOCK lock;
	ret = lock_put(lt, lock);</pre></blockquote>
should now be written as follows:
<blockquote><pre>DB_ENV *dbenv;
DB_LOCK *lock;
	ret = lock_put(dbenv, lock);</pre></blockquote>
Similarly, all of the functions:
<blockquote><pre>log_archive
log_compare
log_file
log_flush
log_get
log_put
log_register
log_stat
log_unregister</pre></blockquote>
should have their DB_LOG argument replaced with a reference to a
<a href="../../api_c/env_class.html">DB_ENV</a> structure, and the functions:
<blockquote><pre>memp_fopen
memp_register
memp_stat
memp_sync
memp_trickle</pre></blockquote>
should have their DB_MPOOL argument replaced with a reference to a
<a href="../../api_c/env_class.html">DB_ENV</a> structure.
You should remove all references to DB_LOCKTAB, DB_LOG, DB_MPOOL, and
DB_TXNMGR structures from your application, they are no longer useful
in any way. In fact, a simple way to identify all of the places that
need to be upgraded is to remove all such structures and variables
they declare, and then compile. You will see a warning message from
your compiler in each case that needs to be upgraded.
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