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<h1>DB_TXN->discard</h1>
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<h3><pre>
#include <db.h>
<p>
int
DB_TXN->discard(DB_TXN *tid, u_int32_t flags);
</pre></h3>
<h1>Description</h1>
<p>The DB_TXN->discard method frees up all the per-process resources
associated with the specified <a href="../api_c/txn_class.html">DB_TXN</a> handle, neither committing
nor aborting the transaction. This call may be used only after calls
to <a href="../api_c/txn_recover.html">DB_ENV->txn_recover</a> when there are multiple global transaction
managers recovering transactions in a single Berkeley DB environment. Any
transactions returned by <a href="../api_c/txn_recover.html">DB_ENV->txn_recover</a> that are not handled by
the current global transaction manager should be discarded using
DB_TXN->discard.
<p>The <b>flags</b> parameter is currently unused, and must be set to 0.
<p>The DB_TXN->discard method returns EINVAL if the transaction handle does
not refer to a transaction that was recovered into a prepared but not
yet completed state.
Otherwise, the DB_TXN->discard method returns a non-zero error value on failure and 0 on success.
<p>After DB_TXN->discard has been called, regardless of its return, the
<a href="../api_c/txn_class.html">DB_TXN</a> handle may not be accessed again.
<h1>Errors</h1>
<p>The DB_TXN->discard method may fail and return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>The transaction handle does not refer to a transaction that was
recovered into a prepared but not yet completed state.
</dl>
<p>The DB_TXN->discard method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the DB_TXN->discard method may fail and
return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>Class</h1>
<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/txn_class.html">DB_TXN</a>
<h1>See Also</h1>
<a href="../api_c/txn_list.html">Transaction Subsystem and Related Methods</a>
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