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Check for threads of control (either a true thread or a process)
that have exited while manipulating Berkeley DB library data
structures, while holding a logical database lock, or with an
unresolved transaction (that is, a transaction that was never
aborted or committed).
</div><p />
<b>Namespace:</b>
<a href="N_BerkeleyDB.htm">BerkeleyDB</a><br />
<b>Assembly:</b>
<span sdata="assembly">libdb_dotnet48</span> (in libdb_dotnet48.dll) Version: 4.8.24.0<h1 class="heading"><span onclick="ExpandCollapse(syntaxToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(syntaxToggle, event)" tabindex="0"><img id="syntaxToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Syntax</span></h1><div id="syntaxSection" class="section" name="collapseableSection" style=""><div id="syntaxCodeBlocks" class="code"><span codeLanguage="CSharp"><table><tr><th>C#</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">void</span> <span class="identifier">FailCheck</span>()</pre></td></tr></table></span><span codeLanguage="VisualBasicDeclaration"><table><tr><th>Visual Basic (Declaration)</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">Public</span> <span class="keyword">Sub</span> <span class="identifier">FailCheck</span></pre></td></tr></table></span><span codeLanguage="ManagedCPlusPlus"><table><tr><th>Visual C++</th></tr><tr><td><pre xml:space="preserve"><span class="keyword">public</span>:
<span class="keyword">void</span> <span class="identifier">FailCheck</span>()</pre></td></tr></table></span></div></div><h1 class="heading"><span onclick="ExpandCollapse(remarksToggle)" style="cursor:default;" onkeypress="ExpandCollapse_CheckKey(remarksToggle, event)" tabindex="0"><img id="remarksToggle" class="toggle" name="toggleSwitch" src="../icons/collapse_all.gif" />Remarks</span></h1><div id="remarksSection" class="section" name="collapseableSection" style="">
<p>
For more information, see Architecting Data Store and Concurrent
Data Store applications, and Architecting Transactional Data Store
applications, both in the Berkeley DB Programmer's Reference Guide.
</p>
<p>
FailCheck is based on the <a href="P_BerkeleyDB_DatabaseEnvironment_SetThreadID.htm">SetThreadID</a> and
<a href="P_BerkeleyDB_DatabaseEnvironment_ThreadIsAlive.htm">ThreadIsAlive</a> delegates. Applications calling
FailCheck must have already set <a href="P_BerkeleyDB_DatabaseEnvironment_ThreadIsAlive.htm">ThreadIsAlive</a>, and
must have configured <a href="P_BerkeleyDB_DatabaseEnvironment_ThreadCount.htm">ThreadCount</a>.
</p>
<p>
If FailCheck determines a thread of control exited while holding
database read locks, it will release those locks. If FailCheck
determines a thread of control exited with an unresolved
transaction, the transaction will be aborted. In either of these
cases, FailCheck will return successfully and the application may
continue to use the database environment.
</p>
<p>
In either of these cases, FailCheck will also report the process and
thread IDs associated with any released locks or aborted
transactions. The information is printed to a specified output
channel (see <span class="nolink">[!:MessageFile]</span> for more information), or
passed to an application delegate (see <span class="nolink">[!:MessageCall]</span> for
more information).
</p>
<p>
If FailCheck determines a thread of control has exited such that
database environment recovery is required, it will throw
<a href="T_BerkeleyDB_RunRecoveryException.htm">RunRecoveryException</a>. In this case, the application
should not continue to use the database environment. For a further
description as to the actions the application should take when this
failure occurs, see Handling failure in Data Store and Concurrent
Data Store applications, and Handling failure in Transactional Data
Store applications, both in the Berkeley DB Programmer's Reference
Guide.
</p>
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