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<h1>DbEnv.set_tas_spins</h1>
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<h3><pre>
import com.sleepycat.db.*;
<p>
static int
DbEnv.set_tas_spins(u_int32_t tas_spins);
throws DbException;
</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 DbEnv.set_tas_spins interface affects the entire application, not a single
database or database environment.
<p>Although the DbEnv.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="../../db4-devel-4.0.14/api_c/env_create.html">db_env_create</a> or <a href="../../db4-devel-4.0.14/api_c/db_create.html">db_create</a> methods.
<p>The DbEnv.set_tas_spins method throws an exception that encapsulates a non-zero error value on
failure.
<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>The DbEnv.set_tas_spins method may fail and throw an exception encapsulating 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 DbEnv.set_tas_spins method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv.set_tas_spins method may fail and throw
a <a href="../../db4-devel-4.0.14/api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
will fail in the same way.
<h1>Class</h1>
<a href="../../db4-devel-4.0.14/api_java/dbenv_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../../db4-devel-4.0.14/api_java/env_close.html">DbEnv.close</a>,
<a href="../../db4-devel-4.0.14/api_java/env_version.html">DbEnv.get_version_string</a>,
<a href="../../db4-devel-4.0.14/api_java/env_open.html">DbEnv.open</a>,
<a href="../../db4-devel-4.0.14/api_java/env_remove.html">DbEnv.remove</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_cachesize.html">DbEnv.set_cachesize</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_data_dir.html">DbEnv.set_data_dir</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_errcall.html">DbEnv.set_errcall</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_error_stream.html">DbEnv.set_error_stream</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_errpfx.html">DbEnv.set_errpfx</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_feedback.html">DbEnv.set_feedback</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_flags.html">DbEnv.set_flags</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_rec_init.html">DbEnv.set_recovery_init</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_rpc_server.html">DbEnv.set_rpc_server</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_shm_key.html">DbEnv.set_shm_key</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_tas_spins.html">DbEnv.set_tas_spins</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_tmp_dir.html">DbEnv.set_tmp_dir</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_timeout.html">DbEnv.set_timeout</a>,
<a href="../../db4-devel-4.0.14/api_java/env_set_verbose.html">DbEnv.set_verbose</a>,
and <a href="../../db4-devel-4.0.14/api_java/env_strerror.html">DbEnv.strerror</a>.
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