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+<!-- keywords: sqlite3_progress_handler -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Query Progress Callbacks</h2>
+</div>
+<blockquote><pre>
+void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
+</pre></blockquote>
+<p>
+The sqlite3_progress_handler(D,N,X,P) interface causes the callback
+function X to be invoked periodically during long running calls to
+<a href="../c3ref/step.html">sqlite3_step()</a> and <a href="../c3ref/prepare.html">sqlite3_prepare()</a> and similar for
+database connection D.  An example use for this
+interface is to keep a GUI updated during a large query.</p>
+
+<p>The parameter P is passed through as the only parameter to the
+callback function X.  The parameter N is the approximate number of
+<a href="../opcode.html">virtual machine instructions</a> that are evaluated between successive
+invocations of the callback X.  If N is less than one then the progress
+handler is disabled.</p>
+
+<p>Only a single progress handler may be defined at one time per
+<a href="../c3ref/sqlite3.html">database connection</a>; setting a new progress handler cancels the
+old one.  Setting parameter X to NULL disables the progress handler.
+The progress handler is also disabled by setting N to a value less
+than 1.</p>
+
+<p>If the progress callback returns non-zero, the operation is
+interrupted.  This feature can be used to implement a
+"Cancel" button on a GUI progress dialog box.</p>
+
+<p>The progress handler callback must not do anything that will modify
+the database connection that invoked the progress handler.
+Note that <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a> and <a href="../c3ref/step.html">sqlite3_step()</a> both modify their
+database connections for the meaning of "modify" in this paragraph.</p>
+
+<p>The progress handler callback would originally only be invoked from the
+bytecode engine.  It still might be invoked during <a href="../c3ref/prepare.html">sqlite3_prepare()</a>
+and similar because those routines might force a reparse of the schema
+which involves running the bytecode engine.  However, beginning with
+SQLite version 3.41.0, the progress handler callback might also be
+invoked directly from <a href="../c3ref/prepare.html">sqlite3_prepare()</a> while analyzing and generating
+code for complex queries.
+</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>
+