Greenlets: where are they now???

John Lenton john at
Tue Sep 14 15:03:51 CEST 2004

On Mon, Sep 13, 2004 at 08:12:07PM -0700, David Pokorny wrote:
> "Peter Hansen" <peter at> wrote in message
> news:29Cdnar3ZOqUFtjcRVn-pg at
> > > Greenlets are about 90% of a solution (which I've thought hard about) to
> the
> > > problem of interrupting an execution after 50 byte-code, while retaining
> the
> > > ability to resume the execution (for, say, another 50 byte codes).
> >
> > Python's regular threads already allow this, so there must be
> > something more to it.
> I haven't the faintest idea how to gain fine control over threads. In
> particular, suppose I have 10 of these "executions" going (lets call them
> "steplets") and I want to run each of them for 50 byte-codes, then switch
> back to the controlling thread and do lots of bookkeeping (I don't control
> the code that the steplets run). I also have a bunch of other processes that
> I don't want to take part in this "cycle rationing" but rather run as honest
> threads.

wouldn't calling setcheckinterval with some ridiculously large
argument on entering the loop and setting it back to 100 (or 50) on
exit be enough?

John Lenton (john at -- Random fortune:
Q:	How many Marxists does it take to screw in a light bulb?
A:	None:  The light bulb contains the seeds of its own revolution.
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