<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DB_ENV->set_isalive()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C API Reference" /> <link rel="up" href="env.html" title="Chapter 5. The DB_ENV Handle" /> <link rel="prev" href="envset_intermediate_dir_mode.html" title="DB_ENV->set_intermediate_dir_mode()" /> <link rel="next" href="envset_memory_init.html" title="DB_ENV->set_memory_init()" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DB_ENV->set_isalive()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="envset_intermediate_dir_mode.html">Prev</a> </td> <th width="60%" align="center">Chapter 5. The DB_ENV Handle </th> <td width="20%" align="right"> <a accesskey="n" href="envset_memory_init.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="envset_isalive"></a>DB_ENV->set_isalive()</h2> </div> </div> </div> <pre class="programlisting">#include <db.h> int DB_ENV->set_isalive(DB_ENV *dbenv, int (*is_alive)(DB_ENV *dbenv, pid_t pid, db_threadid_t tid, u_int32_t flags)); </pre> <p> Declare a function that returns if a thread of control (either a true thread or a process) is still running. The <code class="methodname">DB_ENV->set_isalive()</code> method supports the <a class="xref" href="envfailchk.html" title="DB_ENV->failchk()">DB_ENV->failchk()</a> method. For more information, see <a href="../../programmer_reference/cam_app.html" class="olink">Architecting Data Store and Concurrent Data Store applications</a>, and <a href="../../programmer_reference/transapp_app.html" class="olink">Architecting Transactional Data Store applications</a>, both in the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>. </p> <p> The <code class="methodname">DB_ENV->set_isalive()</code> method configures operations performed using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> handle, not all operations performed on the underlying database environment. </p> <p> The <code class="methodname">DB_ENV->set_isalive()</code> method may be called at any time during the life of the application. </p> <p> The <code class="methodname">DB_ENV->set_isalive()</code> <span> <span> method returns a non-zero error value on failure and 0 on success. </span> </span> </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp52130952"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp52131144"></a>is_alive</h4> </div> </div> </div> <p> The <span class="bold"><strong>is_alive</strong></span> parameter is a function which returns non-zero if the thread of control, identified by the <span class="bold"><strong>pid</strong></span> and <span class="bold"><strong>tid</strong></span> arguments, is still running. The function takes four arguments: </p> <div class="itemizedlist"> <ul type="disc"> <li> <p> <span class="bold"><strong>dbenv</strong></span> </p> <p> The <span class="bold"><strong>dbenv</strong></span> parameter is the enclosing database environment handle, allowing application access to the application-private fields of that object. </p> </li> <li> <p> <span class="bold"><strong>pid</strong></span> </p> <p> The <span class="bold"><strong>pid</strong></span> parameter is a process ID returned by the function specified to the <a class="xref" href="envset_thread_id.html" title="DB_ENV->set_thread_id()">DB_ENV->set_thread_id()</a> method. </p> </li> <li> <p> <span class="bold"><strong>tid</strong></span> </p> <p> The <span class="bold"><strong>tid</strong></span> parameter is a thread ID returned by the function specified to the <a class="xref" href="envset_thread_id.html" title="DB_ENV->set_thread_id()">DB_ENV->set_thread_id()</a> method. </p> </li> <li> <p> <span class="bold"><strong>flags</strong></span> </p> <p> The <span class="bold"><strong>flags</strong></span> parameter must be set to 0 or the following value: </p> <div class="itemizedlist"> <ul type="circle"> <li> <p><a id="isalive_DB_MUTEX_PROCESS_ONLY"></a> <code class="literal">DB_MUTEX_PROCESS_ONLY</code> </p> <p> Return only if the process is alive, the thread ID should be ignored. </p> </li> </ul> </div> </li> </ul> </div> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp52154048"></a>Errors</h3> </div> </div> </div> <p> The <code class="methodname">DB_ENV->set_isalive()</code> <span> <span> method may fail and 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="idp52165880"></a>EINVAL</h4> </div> </div> </div> <p> 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="idp52168088"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp52160248"></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> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="envset_intermediate_dir_mode.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="env.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="envset_memory_init.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DB_ENV->set_intermediate_dir_mode() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DB_ENV->set_memory_init()</td> </tr> </table> </div> </body> </html>