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Import BSDDB 4.7.25 (as of svn r89086)

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Zachary Ware
2017-09-04 13:40:25 -05:00
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<head>
<title>Berkeley DB: DB_ENV-&gt;set_lk_max_locks</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<td>
<b>DB_ENV-&gt;set_lk_max_locks</b>
</td>
<td align=right>
<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a>
<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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<tt>
<b><pre>
#include &lt;db.h&gt;
<p>
int
DB_ENV-&gt;set_lk_max_locks(DB_ENV *dbenv, u_int32_t max);
<p>
int
DB_ENV-&gt;get_lk_max_locks(DB_ENV *dbenv, u_int32_t *lk_maxp);
</pre></b>
<hr size=1 noshade>
<b>Description: DB_ENV-&gt;set_lk_max_locks</b>
<p>Set the maximum number of locks supported by the Berkeley DB environment.
This value is used by <a href="../api_c/env_open.html">DB_ENV-&gt;open</a> to estimate how much space to
allocate for various lock-table data structures. The default value is
1000 locks. For specific information on configuring the size of the lock
subsystem, see <a href="../ref/lock/max.html">Configuring locking:
sizing the system</a>.</p>
<p>The database environment's maximum number of locks may also be configured using the
environment's <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file. The syntax of the entry in that
file is a single line with the string "set_lk_max_locks", one or more whitespace
characters, and the number of locks.
Because the <a href="../ref/env/db_config.html#DB_CONFIG">DB_CONFIG</a> file is read when the database environment
is opened, it will silently overrule configuration done before that
time.</p>
<p>The DB_ENV-&gt;set_lk_max_locks method configures a database environment, not only operations
performed using the specified <a href="../api_c/env_class.html">DB_ENV</a> handle.</p>
<p>The DB_ENV-&gt;set_lk_max_locks method may not be called after the <a href="../api_c/env_open.html">DB_ENV-&gt;open</a> method is
called.
If the database environment already exists when
<a href="../api_c/env_open.html">DB_ENV-&gt;open</a> is called, the information specified to DB_ENV-&gt;set_lk_max_locks
will be ignored.
</p>
<p>The DB_ENV-&gt;set_lk_max_locks method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
<b>max</b><ul compact><li>The <b>max</b> parameter is the maximum number of locks supported by
the Berkeley DB environment.</ul>
<br>
<br><b>Errors</b>
<p>The DB_ENV-&gt;set_lk_max_locks method
may fail and return one of the following non-zero errors:</p>
<br>
<b>EINVAL</b><ul compact><li>If the method was called after <a href="../api_c/env_open.html">DB_ENV-&gt;open</a> was called; or if an
invalid flag value or parameter was specified.</ul>
<br>
<hr size=1 noshade>
<b>Description: DB_ENV-&gt;get_lk_max_locks</b>
<p>The DB_ENV-&gt;get_lk_max_locks method returns the maximum number of locks.</p>
<p>The DB_ENV-&gt;get_lk_max_locks method may be called at any time during the life of the
application.</p>
<p>The DB_ENV-&gt;get_lk_max_locks method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
<b>lk_maxp</b><ul compact><li>The DB_ENV-&gt;get_lk_max_locks method returns the
maximum number of locks in <b>lk_maxp</b>.</ul>
<br>
<hr size=1 noshade>
<br><b>Class</b>
<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/lock_class.html">DB_LOCK</a>
<br><b>See Also</b>
<a href="../api_c/lock_list.html">Locking Subsystem and Related Methods</a>
</tt>
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