1 files changed, 37 insertions, 0 deletions
diff --git a/setuptools/_distutils/tests/test_msvccompiler.py b/setuptools/_distutils/tests/test_msvccompiler.py
index b518d6a7..88d912b1 100644
--- a/setuptools/_distutils/tests/test_msvccompiler.py
+++ b/setuptools/_distutils/tests/test_msvccompiler.py
@@ -2,6 +2,7 @@
 import sys
 import unittest
 import os
+import threading
 
 from distutils.errors import DistutilsPlatformError
 from distutils.tests import support
@@ -74,6 +75,42 @@ class msvccompilerTestCase(support.TempdirManager,
         else:
             raise unittest.SkipTest("VS 2015 is not installed")
 
+
+class CheckThread(threading.Thread):
+    exc_info = None
+
+    def run(self):
+        try:
+            super().run()
+        except Exception:
+            self.exc_info = sys.exc_info()
+
+    def __bool__(self):
+        return not self.exc_info
+
+
+class TestSpawn(unittest.TestCase):
+    def test_concurrent_safe(self):
+        """
+        Concurrent calls to spawn should have consistent results.
+        """
+        import distutils._msvccompiler as _msvccompiler
+        compiler = _msvccompiler.MSVCCompiler()
+        compiler._paths = "expected"
+        inner_cmd = 'import os; assert os.environ["PATH"] == "expected"'
+        command = ['python', '-c', inner_cmd]
+
+        threads = [
+            CheckThread(target=compiler.spawn, args=[command])
+            for n in range(100)
+        ]
+        for thread in threads:
+            thread.start()
+        for thread in threads:
+            thread.join()
+        assert all(threads)
+
+
 def test_suite():
     return unittest.makeSuite(msvccompilerTestCase)