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<title>Berkeley DB: DbEnv::set_lk_conflicts</title>
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<h1>DbEnv::set_lk_conflicts</h1>
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#include <db_cxx.h>
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DbEnv::set_lk_conflicts(u_int8_t *conflicts, int nmodes);
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<p>Set the locking conflicts matrix.
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The <b>conflicts</b> argument
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is an <b>nmodes</b> by <b>nmodes</b> array.
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A non-0 value for the array element indicates that requested_mode and
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<p><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.
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<p>If DbEnv::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.
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<p>The DbEnv::set_lk_conflicts method configures a database environment, not only operations
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performed using the specified <a href="../api_cxx/env_class.html">DbEnv</a> handle.
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<p>The DbEnv::set_lk_conflicts interface may not be called after the <a href="../api_cxx/env_open.html">DbEnv::open</a>
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If the database environment already exists when
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<a href="../api_cxx/env_open.html">DbEnv::open</a> is called, the information specified to DbEnv::set_lk_conflicts
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<p>The DbEnv::set_lk_conflicts method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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<p>The DbEnv::set_lk_conflicts method may fail and throw an exception or return a non-zero error for the following conditions:
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<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
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<p>Called after <a href="../api_cxx/env_open.html">DbEnv::open</a> was called.
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<p><dt>ENOMEM<dd>No memory was available to copy the conflicts array.
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<p>The DbEnv::set_lk_conflicts method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
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If a catastrophic error has occurred, the DbEnv::set_lk_conflicts method may fail and
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either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
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<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
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in which case all subsequent Berkeley DB calls will fail in the same way.
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<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/lock_class.html">DbLock</a>
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<a href="../api_cxx/lock_list.html">Locking Subsystem and Related Methods</a>
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