Handle Windows, where signal package doesn't have SIGUSR1.

OpenMDAO · Sep 9, 2020 · 5dce37f · 5dce37f
1 parent e3f7d78
commit 5dce37f
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/openmdao/drivers/pyoptsparse_driver.py b/openmdao/drivers/pyoptsparse_driver.py
@@ -66,6 +66,11 @@
 }
 """
 
+try:
+    DEFAULT_SIGNAL = signal.SIGUSR1
+except AttributeError:
+    DEFAULT_SIGNAL = None
+
 
 class UserRequestedException(Exception):
     """
@@ -188,7 +193,7 @@ def _declare_options(self):
         self.options.declare('gradient method', default='openmdao',
                              values={'openmdao', 'pyopt_fd', 'snopt_fd'},
                              desc='Finite difference implementation to use')
-        self.options.declare('user_terminate_signal', default=signal.SIGUSR1, allow_none=True,
+        self.options.declare('user_terminate_signal', default=DEFAULT_SIGNAL, allow_none=True,
                              desc='OS signal that triggers a clean user-termination. Only SNOPT'
                              'supports this option.')