Richard Oudkerk added the comment: Python 3.2 has extra code in _PyImport_ReInitLock() which means that when a fork happens as a side effect of an import, the main thread of the forked process owns the import lock. Therefore other threads in the forked process cannot import anything.
_PyImport_ReInitLock(void) { if (import_lock != NULL) import_lock = PyThread_allocate_lock(); if (import_lock_level > 1) { /* Forked as a side effect of import */ long me = PyThread_get_thread_ident(); PyThread_acquire_lock(import_lock, 0); /* XXX: can the previous line fail? */ import_lock_thread = me; import_lock_level--; } else { import_lock_thread = -1; import_lock_level = 0; } } I think the reason this code is not triggered in Python 3.3 is the introduction of per-module import locks. ---------- type: behavior -> crash _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue15914> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com