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+<!-- keywords: sqlite3_mutex_held sqlite3_mutex_notheld -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Mutex Verification Routines</h2>
+</div>
+<blockquote><pre>
+#ifndef NDEBUG
+int sqlite3_mutex_held(sqlite3_mutex*);
+int sqlite3_mutex_notheld(sqlite3_mutex*);
+#endif
+</pre></blockquote>
+<p>
+The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines
+are intended for use inside assert() statements.  The SQLite core
+never uses these routines except inside an assert() and applications
+are advised to follow the lead of the core.  The SQLite core only
+provides implementations for these routines when it is compiled
+with the SQLITE_DEBUG flag.  External mutex implementations
+are only required to provide these routines if SQLITE_DEBUG is
+defined and if NDEBUG is not defined.</p>
+
+<p>These routines should return true if the mutex in their argument
+is held or not held, respectively, by the calling thread.</p>
+
+<p>The implementation is not required to provide versions of these
+routines that actually work. If the implementation does not provide working
+versions of these routines, it should at least provide stubs that always
+return true so that one does not get spurious assertion failures.</p>
+
+<p>If the argument to sqlite3_mutex_held() is a NULL pointer then
+the routine should return 1.   This seems counter-intuitive since
+clearly the mutex cannot be held if it does not exist.  But
+the reason the mutex does not exist is because the build is not
+using mutexes.  And we do not want the assert() containing the
+call to sqlite3_mutex_held() to fail, so a non-zero return is
+the appropriate thing to do.  The sqlite3_mutex_notheld()
+interface should also return 1 when given a NULL pointer.
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+