mirror of
https://github.com/MariaDB/server.git
synced 2025-09-11 05:52:26 +03:00
71 lines
3.4 KiB
HTML
71 lines
3.4 KiB
HTML
<!--$Id: env_set_tas_spins.so,v 10.9 2000/05/31 15:10:00 bostic Exp $-->
|
|
<!--Copyright 1997, 1998, 1999, 2000 by Sleepycat Software, Inc.-->
|
|
<!--All rights reserved.-->
|
|
<html>
|
|
<head>
|
|
<title>Berkeley DB: db_env_set_tas_spins</title>
|
|
<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
|
|
<meta name="keywords" content="embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++">
|
|
</head>
|
|
<body bgcolor=white>
|
|
<a name="2"><!--meow--></a>
|
|
<table><tr valign=top>
|
|
<td>
|
|
<h1>db_env_set_tas_spins</h1>
|
|
</td>
|
|
<td width="1%">
|
|
<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
|
|
</td></tr></table>
|
|
<hr size=1 noshade>
|
|
<tt>
|
|
<h3><pre>
|
|
#include <db.h>
|
|
<p>
|
|
int
|
|
db_env_set_tas_spins(u_int32_t tas_spins);
|
|
</pre></h3>
|
|
<h1>Description</h1>
|
|
<p>Specify that test-and-set mutexes should spin <b>tas_spins</b> times
|
|
without blocking. The value defaults to 1 on uniprocessor systems and
|
|
to 50 times the number of processors on multiprocessor systems.
|
|
<p>The db_env_set_tas_spins interface affects the entire application, not a single
|
|
database or database environment.
|
|
<p>While the db_env_set_tas_spins interface may be used to configure Berkeley DB at any time
|
|
during the life of the application, it should normally be called before
|
|
making any 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> functions.
|
|
<p>The db_env_set_tas_spins function returns a non-zero error value on failure and 0 on success.
|
|
<p>The database environment's test-and-set spin count may also be set using the environment's
|
|
<b>DB_CONFIG</b> file. The syntax of the entry in that file is a
|
|
single line with the string "set_tas_spins", one or more whitespace characters,
|
|
and the number of spins. Because the <b>DB_CONFIG</b> file is read when the database
|
|
environment is opened, it will silently overrule configuration done
|
|
before that time.
|
|
<h1>Errors</h1>
|
|
<p><dl compact>
|
|
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
|
|
</dl>
|
|
<h1>See Also</h1>
|
|
<a href="../api_c/env_close.html">DBENV->close</a>,
|
|
<a href="../api_c/env_create.html">db_env_create</a>,
|
|
<a href="../api_c/env_open.html">DBENV->open</a>,
|
|
<a href="../api_c/env_remove.html">DBENV->remove</a>,
|
|
<a href="../api_c/db_err.html">DBENV->err</a>,
|
|
<a href="../api_c/env_strerror.html">db_strerror</a>,
|
|
<a href="../api_c/env_version.html">db_version</a>,
|
|
<a href="../api_c/env_set_cachesize.html">DBENV->set_cachesize</a>,
|
|
<a href="../api_c/env_set_errcall.html">DBENV->set_errcall</a>,
|
|
<a href="../api_c/env_set_errfile.html">DBENV->set_errfile</a>,
|
|
<a href="../api_c/env_set_errpfx.html">DBENV->set_errpfx</a>,
|
|
<a href="../api_c/env_set_flags.html">DBENV->set_flags</a>,
|
|
<a href="../api_c/env_set_mutexlocks.html">DBENV->set_mutexlocks</a>,
|
|
<a href="../api_c/env_set_paniccall.html">DBENV->set_paniccall</a>,
|
|
and
|
|
<a href="../api_c/env_set_verbose.html">DBENV->set_verbose</a>.
|
|
</tt>
|
|
<table><tr><td><br></td><td width="1%">
|
|
<a href="../api_c/c_index.html"><img src="../images/api.gif" alt="API"></a><a href="../ref/toc.html"><img src="../images/ref.gif" alt="Ref"></a>
|
|
</td></tr></table>
|
|
<p><font size=1><a href="http://www.sleepycat.com">Copyright Sleepycat Software</a></font>
|
|
</body>
|
|
</html>
|