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<! "@(#)close.so 10.8 (Sleepycat) 9/29/98">
<!Copyright 1997, 1998 by Sleepycat Software, Inc. All rights reserved.>
<html>
<body bgcolor=white>
<head>
<title>Berkeley DB: DbTxnMgr::close</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btr
ee,hash,hashing,transaction,transactions,locking,logging,access method,access me
thods,java,C,C++">
</head>
<h1>DbTxnMgr::close</h1>
<hr size=1 noshade>
<tt>
<h3>
<pre>
#include <db_cxx.h>
<p>
int
DbTxnMgr::close();
</pre>
</h3>
<h1>Description</h1>
<p>
The DbTxnMgr::close method detaches a process from the transaction environment
specified by the <a href="../../api_cxx/DbTxnMgr/class.html">DbTxnMgr</a> object. All mapped regions are unmapped
and any allocated resources are freed. Any uncommitted transactions are
aborted.
<p>
In addition, if the <b>dir</b> argument to <a href="../../api_cxx/DbTxnMgr/open.html">DbTxnMgr::open</a> was NULL and
<b>dbenv</b> was not initialized using <a href="../../api_cxx/DbEnv/appinit.html">DbEnv::appinit</a>,
all files created for this shared region will be removed, as if
the <a href="../../api_cxx/DbTxnMgr/unlink.html">DbTxnMgr::unlink</a> method were called.
<p>
<p>
In multi-threaded applications, only a single thread may call the
DbTxnMgr::close method.
<p>
The DbTxnMgr::close
method either returns <b>errno</b> or throws an exception that
encapsulates an <b>errno</b> on failure, and 0 on success.
<p>
<h1>Errors</h1>
If a fatal error occurs in Berkeley DB, the DbTxnMgr::close method may fail and either
return DB_RUNRECOVERY or throw an exception encapsulating DB_RUNRECOVERY,
at which point all subsequent database calls will also fail in the same
way. Methods marked as returning <b>errno</b> will, by default, throw
an exception that encapsulates the error information. The default error
behavior can be changed, see <a href="../../api_cxx/DbException/class.html">DbException</a>.
<p>
The DbTxnMgr::close
method may fail and throw an exception
for any of the errors specified for the following Berkeley DB and C library
functions:
abort(3),
close(3),
fcntl(3),
fflush(3),
fprintf(3),
free(3),
getpid(3),
<a href="../../api_cxx/DbLockTab/vec.html">DbLockTab::vec</a>,
<a href="../../api_cxx/DbLog/flush.html">DbLog::flush</a>,
memset(3),
munmap(3),
shmctl(3),
shmdt(3),
strerror(3),
strlen(3),
<a href="../../api_cxx/DbTxn/abort.html">DbTxn::abort</a>,
unlink(3),
vfprintf(3),
and
vsnprintf(3).
<p>
<h1>Class</h1>
<a href="../../api_cxx/DbTxnMgr/class.html">DbTxnMgr</a>
<p>
<h1>See Also</h1>
<a href="../../api_cxx/DbTxnMgr/begin.html">DbTxnMgr::begin</a>,
<a href="../../api_cxx/DbTxnMgr/checkpoint.html">DbTxnMgr::checkpoint</a>,
DbTxnMgr::close,
<a href="../../api_cxx/DbTxnMgr/open.html">DbTxnMgr::open</a>,
<a href="../../api_cxx/DbTxnMgr/stat.html">DbTxnMgr::stat</a>
and
<a href="../../api_cxx/DbTxnMgr/unlink.html">DbTxnMgr::unlink</a>.
</tt>
</body>
</html>
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