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<!--$Id: set_func_sleep.html,v 1.1.1.1 2003/11/20 22:14:27 toshok Exp $-->
<!--Copyright 1997-2002 by Sleepycat Software, Inc.-->
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<html>
<head>
<title>Berkeley DB: db_env_set_func_sleep</title>
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<table width="100%"><tr valign=top>
<td>
<h1>db_env_set_func_sleep</h1>
</td>
<td align=right>
<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../reftoc.html"><img src="../images/ref.gif" alt="Ref"></a>
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<tt>
<h3><pre>
#include &lt;db.h&gt;
<p>
int
db_env_set_func_sleep(int (*func_sleep)(u_long seconds, u_long microseconds));
</pre></h3>
<h1>Description</h1>
<p>The Berkeley DB library requires the ability to cause a thread of control to
suspend itself for a period of time, relinquishing control of the
processor to any other waiting thread of control.  The
<b>func_sleep</b> argument must conform to the following interface:
<p><blockquote><pre>int sleep(u_long seconds, u_long microseconds);</pre></blockquote>
<p>The <b>seconds</b> and <b>microseconds</b> arguments specify the amount
of time to wait until the suspending thread of control should run again.
<p>The <b>seconds</b> and <b>microseconds</b> arguments may not be
normalized when the <b>sleep</b> function is called; that is, the
<b>microseconds</b> argument may be greater than 1000000.
<p>The <b>func_sleep</b> interface must return the value of <b>errno</b> on
failure and 0 on success.
<p>The db_env_set_func_sleep method configures all operations performed by a process and
all of its threads of control, not operations confined to a single
database environment.
<p>Although the db_env_set_func_sleep interface may be called at any time during the
life of the application, it should normally be called before making
calls to the <a href="../api_c/env_create.html">db_env_create</a> or <a href="../api_c/db_create.html">db_create</a> methods.
<p>The db_env_set_func_sleep method returns a non-zero error value on failure and 0 on success.
<h1>Errors</h1>
<p>The db_env_set_func_sleep method may fail and return a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
</dl>
<p>The db_env_set_func_sleep method may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions.
If a catastrophic error has occurred, the db_env_set_func_sleep method may fail and
return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a>,
in which case all subsequent Berkeley DB calls will fail in the same way.
<h1>See Also</h1>
<a href="../ref/program/runtime.html">Run-time configuration</a>
</tt>
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