2011-09-13 17:44:24 +00:00
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<title>DbEnv::set_isalive()</title>
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<p>Library Version 11.2.5.2</p>
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<th colspan="3" align="center">DbEnv::set_isalive()</th>
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<td width="20%" align="left"><a accesskey="p" href="envset_intermediate_dir_mode.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5.
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The DbEnv Handle
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<td width="20%" align="right"> <a accesskey="n" href="envset_memory_init.html">Next</a></td>
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<h2 class="title" style="clear: both"><a id="envset_isalive"></a>DbEnv::set_isalive()</h2>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::set_isalive(int (*is_alive)(DbEnv *dbenv, pid_t pid,
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db_threadid_t tid, u_int32_t flags));</pre>
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<p>
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Declare a function that returns if a thread of control (either a true
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thread or a process) is still running. The <code class="methodname">DbEnv::set_isalive()</code>
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method supports the <a class="xref" href="envfailchk.html" title="DbEnv::failchk()">DbEnv::failchk()</a> method.
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For more information, see
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<a href="../../programmer_reference/cam_app.html" class="olink">Architecting Data Store and Concurrent
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Data Store applications</a>, and
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<a href="../../programmer_reference/transapp_app.html" class="olink">Architecting Transactional Data Store
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applications</a>, both in the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_isalive()</code> method configures operations performed
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using the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> handle, not all
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operations performed on the underlying database environment.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_isalive()</code> method may be called at any time during the
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life of the application.
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</p>
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<p>
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The <code class="methodname">DbEnv::set_isalive()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3605242"></a>Parameters</h3>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3605234"></a>is_alive</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>is_alive</strong></span> parameter is a function
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which returns non-zero if the thread of control, identified by the
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<span class="bold"><strong>pid</strong></span> and <span class="bold"><strong>tid</strong></span> arguments, is still running. The function
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takes four arguments:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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<span class="bold"><strong>dbenv</strong></span>
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</p>
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<p>
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The <span class="bold"><strong>dbenv</strong></span> parameter is the enclosing
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database environment handle, allowing application access to the
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application-private fields of that object.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>pid</strong></span>
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</p>
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<p>
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The <span class="bold"><strong>pid</strong></span> parameter is a process ID
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returned by the function specified to the
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<a class="xref" href="envset_thread_id.html" title="DbEnv::set_thread_id()">DbEnv::set_thread_id()</a>
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method.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>tid</strong></span>
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</p>
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<p>
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The <span class="bold"><strong>tid</strong></span> parameter is a thread ID
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returned by the function specified to the
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<a class="xref" href="envset_thread_id.html" title="DbEnv::set_thread_id()">DbEnv::set_thread_id()</a>
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method.
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</p>
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</li>
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<li>
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<p>
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<span class="bold"><strong>flags</strong></span>
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</p>
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<p>
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The <span class="bold"><strong>flags</strong></span> parameter must be set to 0
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or the following value:
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</p>
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<div class="itemizedlist">
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<ul type="circle">
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<li>
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<p><a id="isalive_DB_MUTEX_PROCESS_ONLY"></a>
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<code class="literal">DB_MUTEX_PROCESS_ONLY</code>
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</p>
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<p>
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Return only if the process is alive, the thread ID
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should be ignored.
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</p>
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</li>
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</ul>
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</div>
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</li>
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</ul>
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</div>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3605546"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::set_isalive()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3603711"></a>EINVAL</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3605759"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3605654"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
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</p>
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<td width="40%" align="left" valign="top">DbEnv::set_intermediate_dir_mode() </td>
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<a accesskey="h" href="index.html">Home</a>
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<td width="40%" align="right" valign="top"> DbEnv::set_memory_init()</td>
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