.. _use_graph_reset:
Use graph::reset() to Reset a Canceled Graph
============================================
When a graph execution is canceled either because of an unhandled
exception or because its task_group_context is canceled explicitly, the
graph and its nodes may be left in an indeterminate state. For example,
in the code samples shown in :ref:`cancel_a_graph` the input 2 may be
left in a buffer. But even beyond remnants in the buffers, there are
other optimizations performed during the execution of a flow graph that
can leave its nodes and edges in an indeterminate state. If you want to
re-execute or restart a graph, you first need to reset the graph:
::
try {
g.wait_for_all();
} catch ( int j ) {
cout << "Caught " << j << "\n";
// do something to fix the problem
g.reset();
f1.try_put(1);
f1.try_put(2);
g.wait_for_all();
}
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