fix existing race condition

Signed-off-by: Mark Halka <mark.halka2001@gmail.com>

Author: markhalka

examples/01_basics/e3_show_graph.py

@@ -25,13 +25,14 @@ def my_graph():
     csp.print("spread2", s2)
 
 
-def main():
-    # open in graphviz viewer
-    # csp.show_graph(my_graph)
-    # or output to file
-    csp.show_graph(my_graph, graph_filename="tmp.png")
+def main(show_graph: bool = False):
+    if show_graph:
+        # open in graphviz viewer
+        # csp.show_graph(my_graph)
+        # or output to file
+        csp.show_graph(my_graph, graph_filename="tmp.png")
     csp.run(my_graph, starttime=datetime(2020, 3, 1), endtime=timedelta(seconds=10))
 
 
 if __name__ == "__main__":
-    main()
+    main(show_graph=True)

examples/98_just_for_fun/e1_csp_nand_computer.py

@@ -104,11 +104,12 @@ def my_graph(bits: int = 16):
     csp.print("x+y_bits", basket_to_bitstring(add))
 
 
-def main():
-    # Show graph with 4-bit ints to limit size
-    csp.showgraph.show_graph(my_graph, 4)
+def main(show_graph: bool = False):
+    if show_graph:
+        # Show graph with 4-bit ints to limit size
+        csp.showgraph.show_graph(my_graph, 4)
     csp.run(my_graph, starttime=datetime(2022, 6, 24))
 
 
 if __name__ == "__main__":
-    main()
+    main(show_graph=True)