Method _release

src/filelock/_windows.py:203–213

(self)

                os.close(fd)  # another holder owns the byte-range lock; let the retry loop try again

        def _release(self) -> None:
            fd = cast("int", self._context.lock_file_fd)
            # Retain the descriptor until the OS unlock succeeds: if UnlockFileEx raises, the byte-range lock is still
            # held, so is_locked must keep reporting held rather than losing the fd. Only after the unlock commits do
            # close and unlink run as post-unlock cleanup; their failure cannot make the lock held again.
            _unlock_fd(fd)
            self._mark_descriptor_released()
            self._close_released_fd(fd, default_suppresses=False)
            if not self._preserve_lock_file:  # preserve_lock_file keeps a stable file identity for the caller (#605)
                with suppress(OSError):
                    Path(self.lock_file).unlink()

    def _open_non_reparse_fd(path: str, mode: int) -> int | None:
        """