Revert "bpo-17852: Maintain a list of BufferedWriter objects. Flush them on exit. (#1908)" (#3337)

This reverts commit e38d12ed34870c140016bef1e0ff10c8c3d3f213.

1 files changed, 0 insertions, 24 deletions

diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 3aa2b24c04..4653847bcb 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -1185,7 +1185,6 @@ class BufferedWriter(_BufferedIOMixin):
         self.buffer_size = buffer_size
         self._write_buf = bytearray()
         self._write_lock = Lock()
-        _register_writer(self)
 
     def writable(self):
         return self.raw.writable()
@@ -2575,26 +2574,3 @@ class StringIO(TextIOWrapper):
     def detach(self):
         # This doesn't make sense on StringIO.
         self._unsupported("detach")
-
-
-# ____________________________________________________________
-
-import atexit, weakref
-
-_all_writers = weakref.WeakSet()
-
-def _register_writer(w):
-    # keep weak-ref to buffered writer
-    _all_writers.add(w)
-
-def _flush_all_writers():
-    # Ensure all buffered writers are flushed before proceeding with
-    # normal shutdown.  Otherwise, if the underlying file objects get
-    # finalized before the buffered writer wrapping it then any buffered
-    # data will be lost.
-    for w in _all_writers:
-        try:
-            w.flush()
-        except:
-            pass
-atexit.register(_flush_all_writers)