fixed incompatibilty to py3.6

osaca/frontend.py

@@ -351,9 +351,9 @@ class Frontend(object):
         lcd_text = (
             "-------------------------------- WARNING: LCD analysis timed out "
             "-------------------------------\n         While searching for all dependency chains"
-            " the analysis timed out.\n         Decrease the number of instructions or set the "
-            "timeout threshold with --lcd-timeout.\n         See --help for more "
-            "information.\n" + dashed_line
+            " the analysis timed out and might be\n         incomplete. Decrease the number of "
+            "instructions or set the timeout threshold\n         with --lcd-timeout. See --help"
+            " for more information.\n" + dashed_line
         )
         warnings = "\n"
         warnings += lcd_text if lcd_warning else ""

osaca/semantics/kernel_dg.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 
 import copy
+import os
+import signal
 import time
 from itertools import chain
 from multiprocessing import Manager, Process, cpu_count
@@ -140,7 +142,9 @@ class KernelDG(nx.DiGraph):
                         # terminate running processes
                         for p in processes:
                             if p.is_alive():
-                                p.kill()
+                                # Python 3.6 does not support Process.kill().
+                                # Can be changed to `p.kill()` after EoL (01/22) of Py3.6
+                                os.kill(p.pid, signal.SIGKILL)
                             p.join()
                 all_paths = list(all_paths)
         else: