Re: What's the problem?

[Martin Stjernholm]

Richard Stallman <address@hidden> wrote:

> /.../ So thread-switching would take some time.  We would want to
> make sure it does not happen very often.

That's a good design principle anyway since thread switches never are
very cheap. Avoiding fine grained locking is afaics the best way to
ensure that thread switches happens seldom. With only buffer local
locks, every callback would normally run to completion in a single
thread slice since threads can't lock out each other. Thread switches
would only occur when things have blocked in I/O (and speed isn't a
factor then), or when cpu bound work is preempted.