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+<!-- keywords: sqlite3_threadsafe -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Test To See If The Library Is Threadsafe</h2>
+</div>
+<blockquote><pre>
+int sqlite3_threadsafe(void);
+</pre></blockquote>
+<p>
+The sqlite3_threadsafe() function returns zero if and only if
+SQLite was compiled with mutexing code omitted due to the
+<a href="../compile.html#threadsafe">SQLITE_THREADSAFE</a> compile-time option being set to 0.</p>
+
+<p>SQLite can be compiled with or without mutexes.  When
+the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE</a> C preprocessor macro is 1 or 2, mutexes
+are enabled and SQLite is threadsafe.  When the
+<a href="../compile.html#threadsafe">SQLITE_THREADSAFE</a> macro is 0,
+the mutexes are omitted.  Without the mutexes, it is not safe
+to use SQLite concurrently from more than one thread.</p>
+
+<p>Enabling mutexes incurs a measurable performance penalty.
+So if speed is of utmost importance, it makes sense to disable
+the mutexes.  But for maximum safety, mutexes should be enabled.
+The default behavior is for mutexes to be enabled.</p>
+
+<p>This interface can be used by an application to make sure that the
+version of SQLite that it is linking against was compiled with
+the desired setting of the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE</a> macro.</p>
+
+<p>This interface only reports on the compile-time mutex setting
+of the <a href="../compile.html#threadsafe">SQLITE_THREADSAFE</a> flag.  If SQLite is compiled with
+SQLITE_THREADSAFE=1 or =2 then mutexes are enabled by default but
+can be fully or partially disabled using a call to <a href="../c3ref/config.html">sqlite3_config()</a>
+with the verbs <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigsinglethread">SQLITE_CONFIG_SINGLETHREAD</a>, <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigmultithread">SQLITE_CONFIG_MULTITHREAD</a>,
+or <a href="../c3ref/c_config_covering_index_scan.html#sqliteconfigserialized">SQLITE_CONFIG_SERIALIZED</a>.  The return value of the
+sqlite3_threadsafe() function shows only the compile-time setting of
+thread safety, not any run-time changes to that setting made by
+sqlite3_config(). In other words, the return value from sqlite3_threadsafe()
+is unchanged by calls to sqlite3_config().</p>
+
+<p>See the <a href="../threadsafe.html">threading mode</a> documentation for additional information.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+