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
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<http://bugs.python.org/issue15914>
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