.

wcfs/__init__.py

@@ -152,6 +152,9 @@ def close(wconn):
 
 
 # _pinner receives pin messages from wcfs and adjusts wconn mappings.
+#
+# XXX must be running without GIL: access to wcfs mmaped memory could come from
+# python code (thus with GIL taken).
 @func(Conn)
 def _pinner(wconn, ctx):
     while 1:

wcfs/wcfs_test.py

@@ -1712,6 +1712,13 @@ class tMapping(object):
         dataok += b'\0'*(f.blksize - len(dataok))   # trailing zeros
 
         blkview = memoryview(t.mmap.mem[blk_inmmap*f.blksize:][:f.blksize])
+
+        # XXX first access without GIL, so that e.g. if there is timeout on
+        # wcfs.py side, _abort_ontimeout could run and kill WCFS.
+        # FIXME also test with GIL locked, since wcfs.py pinner must be itself
+        # running without GIL.
+        _ = read_nogil(blkview[:1])
+        assert _ == dataok[0]
         assert blkview.tobytes() == dataok
 
     # XXX assertData