Amaury Forgeot d'Arc <amauryfa@gmail.com> added the comment: This is not specific to ctypes. Please read http://docs.python.org/c-api/init.html#thread-state-and-the-global-interpret... specially the paragraph that says "...when threads are created from C...". Is it explicit enough? How would you change it? ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue6627> _______________________________________