diff -r 37300a1df7d7 Lib/test/test_pdb.py
--- a/Lib/test/test_pdb.py	Sat Nov 26 22:02:29 2011 +0100
+++ b/Lib/test/test_pdb.py	Sun Nov 27 20:06:48 2011 -0800
@@ -613,6 +613,34 @@
 self.assertNotIn(b'SyntaxError', stdout,
 "Got a syntax error running test script under PDB")
 
+ def test_issue13210(self):
+ # invoking "continue" on a non-main thread triggered an exception
+ # inside signal.signal
+
+ with open(support.TESTFN, 'wb') as f:
+ f.write(b'''
+import threading
+import pdb
+
+def start_pdb():
+ pdb.Pdb().set_trace()
+ x = 1
+ y = 1
+
+t = threading.Thread( target=start_pdb)
+t.start()
+''')
+ cmd = [sys.executable, '-u', support.TESTFN]
+ proc = subprocess.Popen(cmd,
+ stdout=subprocess.PIPE,
+ stdin=subprocess.PIPE,
+ stderr=subprocess.STDOUT,
+ )
+ self.addCleanup(proc.stdout.close)
+ stdout, stderr = proc.communicate(b'cont\n')
+ self.assertNotIn('Error', stdout.decode(),
+ "Got an error running test script under PDB")
+
 def tearDown(self):
 support.unlink(support.TESTFN)
 
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