<!--$Id: env_set_isalive.so,v 10.4 2006/01/27 16:13:48 bostic Exp $--> <!--Copyright (c) 1997,2007 Oracle. All rights reserved.--> <!--See the file LICENSE for redistribution information.--> <html> <head> <title>Berkeley DB: DB_ENV->set_isalive</title> <meta name="description" content="Berkeley DB: An embedded database programmatic toolkit."> <meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++"> </head> <body bgcolor=white> <table width="100%"><tr valign=top> <td> <h3>DB_ENV->set_isalive</h3> </td> <td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a> <a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a></td> </tr></table> <hr size=1 noshade> <tt> <h3><pre> #include <db.h> <p> 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></h3> <hr size=1 noshade> <h3>Description: DB_ENV->set_isalive</h3> <p>Declare a function that returns if a thread of control (either a true thread or a process) is still running. The DB_ENV->set_isalive method supports the <a href="../../db46-devel-4.6.21/api_c/env_failchk.html">DB_ENV->failchk</a> method. For more information, see <a href="../../db46-devel-4.6.21/ref/cam/app.html">Architecting Data Store and Concurrent Data Store applications</a>, and <a href="../../db46-devel-4.6.21/ref/transapp/app.html">Architecting Transactional Data Store applications</a>.</p> <p>The DB_ENV->set_isalive method configures operations performed using the specified <a href="../../db46-devel-4.6.21/api_c/env_class.html">DB_ENV</a> handle, not all operations performed on the underlying database environment.</p> <p>The DB_ENV->set_isalive method may be called at any time during the life of the application.</p> <p>The DB_ENV->set_isalive method returns a non-zero error value on failure and 0 on success. </p> <h3>Parameters</h3> <dl compact> <dt><b>is_alive</b><dd>The <b>is_alive</b> parameter is a function which returns non-zero if the thread of control, identified by the <b>pid</b> and <b>tid</b> arguments, is still running. The function takes four arguments: <dl compact> <dt><b>dbenv</b><dd>The <b>dbenv</b> parameter is the enclosing database environment handle, allowing application access to the application-private fields of that object. <dt><b>pid</b><dd>The <b>pid</b> parameter is a process ID returned by the function specified to the <a href="../../db46-devel-4.6.21/api_c/env_set_thread_id.html">DB_ENV->set_thread_id</a> method. <dt><b>tid</b><dd>The <b>tid</b> parameter is a thread ID returned by the function specified to the <a href="../../db46-devel-4.6.21/api_c/env_set_thread_id.html">DB_ENV->set_thread_id</a> method. <dt><b>flags</b><dd>The <b>flags</b> parameter must be set to 0 or the following value: <dl compact> <dt><a name="DB_MUTEX_PROCESS_ONLY">DB_MUTEX_PROCESS_ONLY</a><dd>Return only if the process is alive, the thread ID should be ignored. </dl> </dl> </dl> <h3>Errors</h3> <p>The DB_ENV->set_isalive method may fail and return one of the following non-zero errors:</p> <dl compact> <dt>EINVAL<dd>An invalid flag value or parameter was specified. </dl> <hr size=1 noshade> <h3>Class</h3> <a href="../../db46-devel-4.6.21/api_c/env_class.html">DB_ENV</a> <h3>See Also</h3> <a href="../../db46-devel-4.6.21/api_c/env_list.html">Database Environments and Related Methods</a> </tt> <table width="100%"><tr><td><br></td><td align=right> <a href="../../db46-devel-4.6.21/api_c/api_core.html"><img src="../../db46-devel-4.6.21/images/api.gif" alt="API"></a><a href="../../db46-devel-4.6.21/ref/toc.html"><img src="../../db46-devel-4.6.21/images/ref.gif" alt="Ref"></a> </td></tr></table> <p><font size=1>Copyright (c) 1996,2007 Oracle. All rights reserved.</font> </body> </html>