On May 31, 2004, at 8:37 PM, Phillip J. Eby wrote:
At 02:09 AM 6/1/04 +0200, Christian Tismer wrote:
Anyway, I don't really get the point. 95% of Stackless is doing soft-switched stackless calls. Behavior is completely controllable. We can easily avoid any special C stack operation, by setting a flag that disallows it (easy to implement) or by excluding the hard switching stuff, completely (not an option now, but easy, too).
If soft-switching is portable (i.e. pure C, no assembly), and is exposed as a library module (so that Jython et al can avoid supporting it), then perhaps a PEP for adding that functionality to mainstream Python would be meaningful.
Soft switching needs to be implemented in a few key places of the interpreter itself or else Stackless would surely have been maintained as an extension module. It is already pure C, no assembly or platform specific code. Supporting the interface from Jython or IronPython should be possible, though at worst case each tasklet might actually be a new thread so it might not be terribly efficient... though it would work.
If that gets in, then the other 5% can always sneak in later via feature creep. ;) Or, more importantly (if I understand correctly), it could be separately distributed as an add-on for platforms that can support it.
Hard switching could be an add-on for platforms that support it..