82 lines
3.7 KiB
HTML
82 lines
3.7 KiB
HTML
<!--$Id: env_set_isalive.html 63573 2008-05-23 21:43:21Z trent.nelson $-->
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<!--Copyright (c) 1997,2008 Oracle. All rights reserved.-->
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<!--See the file LICENSE for redistribution information.-->
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<html>
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<head>
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<title>Berkeley DB: DB_ENV->set_isalive</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<meta name="keywords" content="embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++">
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</head>
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<body bgcolor=white>
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<table width="100%"><tr valign=top>
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<td>
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<b>DB_ENV->set_isalive</b>
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</td>
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<td align=right>
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<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a>
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<a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a></td>
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</tr></table>
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<hr size=1 noshade>
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<tt>
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<b><pre>
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#include <db.h>
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<p>
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int
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DB_ENV->set_isalive(DB_ENV *dbenv,
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int (*is_alive)(DB_ENV *dbenv, pid_t pid, db_threadid_t tid, u_int32_t flags));
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</pre></b>
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<hr size=1 noshade>
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<b>Description: DB_ENV->set_isalive</b>
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<p>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 DB_ENV->set_isalive method
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supports the <a href="../api_c/env_failchk.html">DB_ENV->failchk</a> method. For more information, see
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<a href="../ref/cam/app.html">Architecting Data Store and Concurrent
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Data Store applications</a>, and <a href="../ref/transapp/app.html">Architecting Transactional Data Store applications</a>.</p>
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<p>The DB_ENV->set_isalive method configures operations performed using the specified
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<a href="../api_c/env_class.html">DB_ENV</a> handle, not all operations performed on the underlying
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database environment.</p>
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<p>The DB_ENV->set_isalive method may be called at any time during the life of the
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application.</p>
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<p>The DB_ENV->set_isalive method
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returns a non-zero error value on failure
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and 0 on success.
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</p>
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<b>Parameters</b> <br>
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<b>is_alive</b><ul compact><li>The <b>is_alive</b> parameter is a function which returns non-zero if
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the thread of control, identified by the <b>pid</b> and <b>tid</b>
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arguments, is still running. The function takes four arguments:</ul>
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<br>
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<b><b>dbenv</b></b><ul compact><li>The <b>dbenv</b> parameter is the enclosing database environment
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handle, allowing application access to the application-private fields
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of that object.</ul>
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<b><b>pid</b></b><ul compact><li>The <b>pid</b> parameter is a process ID returned by the function
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specified to the <a href="../api_c/env_set_thread_id.html">DB_ENV->set_thread_id</a> method.</ul>
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<b><b>tid</b></b><ul compact><li>The <b>tid</b> parameter is a thread ID returned by the function
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specified to the <a href="../api_c/env_set_thread_id.html">DB_ENV->set_thread_id</a> method.</ul>
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<b><b>flags</b></b><ul compact><li>The <b>flags</b> parameter must be set to 0 or
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the following value:
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<br>
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<b><a name="DB_MUTEX_PROCESS_ONLY">DB_MUTEX_PROCESS_ONLY</a></b><ul compact><li>Return only if the process is alive, the thread ID should be ignored.</ul>
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<br></ul>
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<br>
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<br>
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<br><b>Errors</b>
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<p>The DB_ENV->set_isalive method
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may fail and return one of the following non-zero errors:</p>
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<br>
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<b>EINVAL</b><ul compact><li>An
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invalid flag value or parameter was specified.</ul>
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<br>
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<hr size=1 noshade>
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<br><b>Class</b>
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<a href="../api_c/env_class.html">DB_ENV</a>
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<br><b>See Also</b>
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<a href="../api_c/env_list.html">Database Environments and Related Methods</a>
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</tt>
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<table width="100%"><tr><td><br></td><td align=right>
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<a href="../api_c/api_core.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
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</td></tr></table>
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<p><font size=1>Copyright (c) 1996,2008 Oracle. All rights reserved.</font>
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</body>
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</html>
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