greenio: only trampoline when we block

https://github.com/eventlet/eventlet/pull/314

tests/isolated/regular_file_readall.py

@@ -0,0 +1,43 @@
+__test__ = False
+
+if __name__ == '__main__':
+    import eventlet
+    eventlet.monkey_patch()
+
+    from eventlet.support import six
+    import io
+    import os
+    import tempfile
+
+    with tempfile.NamedTemporaryFile() as tmp:
+        with io.open(tmp.name, "wb") as fp:
+            fp.write(b"content")
+
+        # test BufferedReader.read()
+        fd = os.open(tmp.name, os.O_RDONLY)
+        fp = os.fdopen(fd, "rb")
+        with fp:
+            content = fp.read()
+        assert content == b'content'
+
+        # test FileIO.read()
+        fd = os.open(tmp.name, os.O_RDONLY)
+        fp = os.fdopen(fd, "rb", 0)
+        with fp:
+            content = fp.read()
+        assert content == b'content'
+
+        if six.PY3:
+            # test FileIO.readall()
+            fd = os.open(tmp.name, os.O_RDONLY)
+            fp = os.fdopen(fd, "rb", 0)
+            with fp:
+                content = fp.readall()
+            assert content == b'content'
+
+        # test FileIO.readall() (for Python 2 and Python 3)
+        with io.open(tmp.name, "rb", 0) as fp:
+            content = fp.readall()
+        assert content == b'content'
+
+    print("pass")

tests/patcher_test.py

@@ -528,3 +528,7 @@ def test_socketserver_selectors():
 
 def test_blocking_select_methods_are_deleted():
     tests.run_isolated('patcher_blocking_select_methods_are_deleted.py')
+
+
+def test_regular_file_readall():
+    tests.run_isolated('regular_file_readall.py')