96 lines
4.1 KiB
HTML
96 lines
4.1 KiB
HTML
<!--$Id: env_set_lk_conflicts.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: DB_ENV->set_lk_conflicts</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>DB_ENV->set_lk_conflicts</b>
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</td>
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<td align=right>
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<a href="../api_c/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.h>
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<p>
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int
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DB_ENV->set_lk_conflicts(DB_ENV *dbenv,
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u_int8_t *conflicts, int nmodes);
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<p>
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int
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DB_ENV->get_lk_conflicts(DB_ENV *dbenv,
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const u_int8_t **lk_conflictsp, int *lk_modesp);
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DB_ENV->set_lk_conflicts</b>
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<p>Set the locking conflicts matrix.</p>
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<p>If DB_ENV->set_lk_conflicts is never called, a standard conflicts
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array is used; see <a href="../ref/lock/stdmode.html">Standard Lock
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Modes</a> for more information.</p>
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<p>The DB_ENV->set_lk_conflicts method configures a database environment, not only operations
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performed using the specified <a href="../api_c/env_class.html">DB_ENV</a> handle.</p>
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<p>The DB_ENV->set_lk_conflicts method may not be called after the <a href="../api_c/env_open.html">DB_ENV->open</a> method is
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called.
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If the database environment already exists when
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<a href="../api_c/env_open.html">DB_ENV->open</a> is called, the information specified to DB_ENV->set_lk_conflicts
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will be ignored.
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</p>
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<p>The DB_ENV->set_lk_conflicts method
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returns a non-zero error value on failure
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and 0 on success.
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</p>
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<b>Parameters</b> <br>
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<b>conflicts</b><ul compact><li>The <b>conflicts</b> parameter is the new locking conflicts matrix.
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The <b>conflicts</b> parameter is an <b>nmodes</b> by <b>nmodes</b>
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array. A non-0 value for the array element indicates that
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requested_mode and held_mode conflict:
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<blockquote><pre>conflicts[requested_mode][held_mode]</pre></blockquote>
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<p>The <i>not-granted</i> mode must be represented by 0.</p></ul>
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<b>nmodes</b><ul compact><li>The <b>nmodes</b> parameter is the size of the lock conflicts matrix.</ul>
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<br>
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<br><b>Errors</b>
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<p>The DB_ENV->set_lk_conflicts method
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may fail and return one of the following non-zero errors:</p>
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<br>
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<b>EINVAL</b><ul compact><li>If the method was called after <a href="../api_c/env_open.html">DB_ENV->open</a> was called; or if an
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invalid flag value or parameter was specified.</ul>
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<br>
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<br>
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<b>ENOMEM</b><ul compact><li>The conflicts array could not be copied.</ul>
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<br>
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<hr size=1 noshade>
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<b>Description: dbenv_get_lk_conflicts</b>
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<p>The DB_ENV->get_lk_conflicts method returns the current conflicts array.</p>
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<p>The DB_ENV->get_lk_conflicts method may be called at any time during the life of the
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application.</p>
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<p>The DB_ENV->get_lk_conflicts method
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returns a non-zero error value on failure
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and 0 on success.
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</p>
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<b>Parameters</b> <br>
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<b>lk_conflictsp</b><ul compact><li>The <b>lk_conflictsp</b> parameter references memory into which
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a pointer to the current conflicts array is copied.</ul>
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<b>lk_modesp</b><ul compact><li>The <b>lk_modesp</b> parameter references memory into which
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the size of the current conflicts array is copied.</ul>
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<br>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/lock_class.html">DB_LOCK</a>
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<br><b>See Also</b>
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<a href="../api_c/lock_list.html">Locking 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_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>
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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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