1 files changed, 22 insertions, 0 deletions
diff --git a/testsuite/tests/lib/IO/openFile008.hs b/testsuite/tests/lib/IO/openFile008.hs
new file mode 100644
index 0000000000..9c1a1c47f8
--- /dev/null
+++ b/testsuite/tests/lib/IO/openFile008.hs
@@ -0,0 +1,22 @@
+import System.IO
+import System.Cmd
+import System.FilePath
+import Text.Printf
+import System.Directory
+import Control.Monad
+
+testdir = "openFile008_testdir"
+
+-- Test repeated opening/closing of 1000 files.  This is useful for guaging
+-- the performance of open/close and file locking.
+main = do
+  system ("rm -rf " ++ testdir)
+  createDirectory testdir
+  let filenames = [testdir </> printf "file%03d" (n::Int) | n <- [1..1000]]
+
+  forM_ [1..50] $ \_ -> do
+    hs <- mapM (\f -> openFile f WriteMode) filenames
+    mapM_ hClose hs
+
+  mapM_ removeFile filenames
+  removeDirectory testdir