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215 lines
8.7 KiB
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DB_ENV->set_thread_id_string()</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C API Reference" />
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<link rel="up" href="env.html" title="Chapter 5. The DB_ENV Handle" />
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<link rel="prev" href="envset_thread_id.html" title="DB_ENV->set_thread_id()" />
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.3</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DB_ENV->set_thread_id_string()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="envset_thread_id.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 5.
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The DB_ENV Handle
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="envset_timeout.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" 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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<h2 class="title" style="clear: both"><a id="envset_thread_id_string"></a>DB_ENV->set_thread_id_string()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db.h>
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int
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DB_ENV->set_thread_id_string(DB_ENV *dbenv,
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char *(*thread_id_string)(DB_ENV *dbenv,
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pid_t pid, db_threadid_t tid, char *buf)); </pre>
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<p>
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Declare a function that formats a process ID and thread ID identifier
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pair for display into a caller-supplied buffer. The function must
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return a reference to the caller-specified buffer. The
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<code class="methodname">DB_ENV->set_thread_id_string()</code> method supports the
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<a class="xref" href="envset_thread_id.html" title="DB_ENV->set_thread_id()">DB_ENV->set_thread_id()</a>
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method.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_thread_id_string()</code> method configures operations
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performed using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
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handle, not all 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">DB_ENV->set_thread_id_string()</code> method may be called at any time
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during the life of the application.
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</p>
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<p>
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The <code class="methodname">DB_ENV->set_thread_id_string()</code> <span>
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<span>
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method returns a non-zero error value on failure and 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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<h3 class="title"><a id="idp60237520"></a>Parameters</h3>
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</div>
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</div>
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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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<h4 class="title"><a id="idp60213800"></a>thread_id_string</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>thread_id_string</strong></span> parameter is a
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function which returns a buffer in which is an identifier pair
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formatted for display. The function 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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<code class="literal">dbenv</code>
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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 database
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environment handle, allowing application access to the application-private
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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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<code class="literal">pid</code>
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</p>
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<p>
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The <span class="bold"><strong>pid</strong></span> argument is a process ID.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">tid</code>
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</p>
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<p>
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The <span class="bold"><strong>tid</strong></span> argument is a thread ID.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">buf</code>
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</p>
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<p>
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The <span class="bold"><strong>buf</strong></span> argument is character array of at least
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DB_THREADID_STRLEN bytes in length, into which the identifier pair should be
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formatted.
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</p>
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</li>
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</ul>
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</div>
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<p>
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If no <span class="bold"><strong>thread_id_string</strong></span> function is specified, the default
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routine displays the identifier pair as "pid/tid", that is, the process ID represented as
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an unsigned integer value, a slash ('/') character, then the thread ID represented as an
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unsigned integer value.
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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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<h3 class="title"><a id="idp60252728"></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">DB_ENV->set_thread_id_string()</code> <span>
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<span>
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method may fail and return one 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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<h4 class="title"><a id="idp60262128"></a>EINVAL</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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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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<h3 class="title"><a id="idp60261264"></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 DB_ENV Handle">DB_ENV</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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<h3 class="title"><a id="idp60263424"></a>See Also</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="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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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="envset_thread_id.html">Prev</a> </td>
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<td width="20%" align="center">
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<a accesskey="u" href="env.html">Up</a>
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</td>
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<td width="40%" align="right"> <a accesskey="n" href="envset_timeout.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DB_ENV->set_thread_id() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DB_ENV->set_timeout()</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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