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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="envset_timeout"></a>DbEnv::set_timeout()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include <db_cxx.h>
int
DbEnv::set_timeout(db_timeout_t timeout, u_int32_t flags); </pre>
<p>
The <code class="methodname">DbEnv::set_timeout()</code> method sets timeout values for locks or
transactions in the database environment, and the wait time for a process to
exit the environment when
<a class="link" href="envopen.html#envopen_DB_REGISTER">DB_REGISTER</a>
recovery is needed.
</p>
<p>
DB_SET_LOCK_TIMEOUT and DB_SET_TXN_TIMEOUT timeouts are checked whenever a
thread of control blocks on a lock or when deadlock detection is performed.
In the case of DB_SET_LOCK_TIMEOUT, the lock is one requested explicitly
through the Lock subsystem interfaces. In the case of DB_SET_TXN_TIMEOUT, the
lock is one requested on behalf of a transaction. In either case, it
may be a lock requested by the database access methods underlying the
application. These timeouts are only checked when the lock request
first blocks or when deadlock detection is performed, the accuracy of
the timeout depends on how often deadlock detection is performed.
</p>
<p>
Lock and transaction timeout values specified for the database environment may
be overridden on a per-lock or per-transaction basis. See
<a class="xref" href="lockvec.html" title="DbEnv::lock_vec()">DbEnv::lock_vec()</a> and
<a class="xref" href="txnset_timeout.html" title="DbTxn::set_timeout()">DbTxn::set_timeout()</a> for
more information.
</p>
<p>
The <code class="methodname">DbEnv::set_timeout()</code> method may not be used in a database
environment without a locking subsystem.
</p>
<p>
The <code class="methodname">DbEnv::set_timeout()</code> method may be called at any time during the
life of the application.
</p>
<p>
The <code class="methodname">DbEnv::set_timeout()</code> <span>
<span>
method either returns a non-zero error value or throws an
exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp2285616"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp2284280"></a>timeout</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>timeout</strong></span> parameter is the timeout value. It must
be specified as an unsigned 32-bit number of microseconds, limiting the maximum
timeout to roughly 71 minutes.
</p>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp2278912"></a>flags</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>flags</strong></span> parameter must be set to
one of the following values:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><a id="set_timeout_DB_SET_LOCK_TIMEOUT"></a>
<code class="literal">DB_SET_LOCK_TIMEOUT</code>
</p>
<p>
Set the timeout value for locks in this database environment.
</p>
<p>
The database environment's lock timeout value may also
be configured using the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
file. The syntax of the entry in that file is a
single line with the string "set_lock_timeout", one or
more whitespace characters, and the lock timeout
value. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read when the
database environment is opened, it will silently
overrule configuration done before that time.
</p>
<p>
This flag configures a database environment, not only operations
performed using the specified
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
</p>
</li>
<li>
<p><a id="set_timeout_DB_SET_MUTEX_FAILCHK_TIMEOUT"></a>
<code class="literal">DB_SET_MUTEX_FAILCHK_TIMEOUT</code>
</p>
<p>
If failchk broadcasting has been configured, then set
the timeout value on how long a thread will wait for a
mutex lock before checking whether <a class="xref" href="envfailchk.html" title="DbEnv::failchk()">DbEnv::failchk()</a> has
marked the mutex as failed. The default is to check
once every second.
</p>
<p>
This wait timeout value may also be configured using
the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax of the
entry in that file is a single line with the string
"set_mutex_failchk_timeout", one or more whitespace characters,
and the wait timeout value. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
file is read when the database environment is opened,
it will silently overrule configuration done before
that time.
</p>
<p>
This flag configures operations performed using the
specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
handle.
</p>
</li>
<li>
<p><a id="set_timeout_DB_SET_REG_TIMEOUT"></a>
<code class="literal">DB_SET_REG_TIMEOUT</code>
</p>
<p>
Set the timeout value on how long to wait for processes to exit the environment
before recovery is started when the
<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method was called with the
<a class="link" href="envopen.html#envopen_DB_REGISTER">DB_REGISTER</a>
flag and recovery must be performed.
</p>
<p>
This wait timeout value may also be configured using
the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax of the
entry in that file is a single line with the string
"set_reg_timeout", one or more whitespace characters,
and the wait timeout value. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
file is read when the database environment is opened,
it will silently overrule configuration done before
that time.
</p>
<p>
This flag configures operations performed using the specified
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
</p>
</li>
<li>
<p><a id="set_timeout_DB_SET_TXN_TIMEOUT"></a>
<code class="literal">DB_SET_TXN_TIMEOUT</code>
</p>
<p>
Set the timeout value for transactions in this database environment.
</p>
<p>
The database environment's transaction timeout value
may also be configured using the environment's
<a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax of the entry in that
file is a single line with the string
"set_txn_timeout", one or more whitespace characters,
and the transaction timeout value. Because the
<a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read when the database environment
is opened, it will silently overrule configuration
done before that time.
</p>
<p>
This flag configures a database environment, not only
operations performed using the specified
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle.
</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp2301624"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">DbEnv::set_timeout()</code> <span>
<span>
method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
exception, encapsulating one of the following non-zero errors, or return one
of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp2298280"></a>EINVAL</h4>
</div>
</div>
</div>
<p>
<code class="literal">DB_SET_MUTEX_FAILCHK_TIMEOUT</code>
was specified even though Berkeley DB was not
configured with
<code class="literal">--enable-failchk_broadcast</code>;
an invalid flag value or parameter was specified;
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp2272888"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp2302056"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
</p>
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