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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/77704] Data race on std::ctype<char>
Date: Fri, 03 May 2024 17:19:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D77704

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu=
.org

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There's a related data race in std::basic_ios::fill() because of these muta=
ble
members:

      mutable char_type                              _M_fill;
      mutable bool                                   _M_fill_init;

      char_type
      fill() const
      {
        if (!_M_fill_init)
          {
            _M_fill =3D this->widen(' ');
            _M_fill_init =3D true;
          }
        return _M_fill;
      }

That one's easier to fix.=