diff -r 5316f9ff3e48 -r 0152a907f714 hgext/fastannotate/context.py
--- a/hgext/fastannotate/context.py	Tue Sep 17 14:20:13 2019 -0400
+++ b/hgext/fastannotate/context.py	Tue Sep 17 14:22:22 2019 -0400
@@ -759,21 +759,6 @@
     def lock(self):
         return lockmod.lock(self._repo.vfs, self._vfspath + '.lock')
 
-    @contextlib.contextmanager
-    def _lockflock(self):
-        """the same as 'lock' but use flock instead of lockmod.lock, to avoid
-        creating temporary symlinks."""
-        import fcntl
-        lockpath = self.linelogpath
-        util.makedirs(os.path.dirname(lockpath))
-        lockfd = os.open(lockpath, os.O_RDONLY | os.O_CREAT, 0o664)
-        fcntl.flock(lockfd, fcntl.LOCK_EX)
-        try:
-            yield
-        finally:
-            fcntl.flock(lockfd, fcntl.LOCK_UN)
-            os.close(lockfd)
-
     @property
     def revmappath(self):
         return self._repo.vfs.join(self._vfspath + '.m')