Let me make sure I understand: If I invoke a continuation when there are extra C stack frames between the mainloop invocation that captured the continuation and the call of the continuation, the interpreter raises an exception?
Not always. Frames which are not currently bound by an interpreter acting on them can always be jump targets. Only those frames which are currently in the middle of an opcode are forbidden.
And how about the reverse? If I'm inside a Python callback from C code, will the Python code be able to use continuations? This is important, because there are a lot of GUI applications where almost all code is executed within a C callback. I'm pretty sure (and otherwise I'll be corrected within milliseconds:-) that this is the case for MacPython IDE and PythonWin (don't know about Idle). -- Jack Jansen | ++++ stop the execution of Mumia Abu-Jamal ++++ Jack.Jansen@oratrix.com | ++++ if you agree copy these lines to your sig ++++ www.oratrix.nl/~jack | see http://www.xs4all.nl/~tank/spg-l/sigaction.htm