1 files changed, 19 insertions, 0 deletions
diff --git a/testsuite/tests/lib/win32/win32002.hs b/testsuite/tests/lib/win32/win32002.hs
new file mode 100644
index 0000000000..0b57985333
--- /dev/null
+++ b/testsuite/tests/lib/win32/win32002.hs
@@ -0,0 +1,19 @@
+{-# LANGUAGE ForeignFunctionInterface #-}
+-- Test that the Win32 error code from getLastError is thread-local.
+
+import System.Win32
+import Control.Monad
+import Control.Concurrent
+
+main = do
+  setLastError 42
+  r <- getLastError
+  when (r /= 42) $ fail ("wrong: " ++ show r)
+  m <- newEmptyMVar
+  forkIO $ do setLastError 43; putMVar m ()
+  takeMVar m
+  r <- getLastError
+  when (r /= 42) $ fail ("wrong: " ++ show r)
+
+foreign import stdcall unsafe "windows.h SetLastError"
+  setLastError :: ErrCode -> IO ()