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preemptive coroutines (Score:1)
Yes, currently you will have to explicitly cede control to the other coroutines regularly. However, Yuval is currently trying to get his patch [github.com] implementing preemptive coros merged into Coro. Those allow control to be automatically passed to other Coros using different strategies like opcode counting and fixed timeslices. That'd at least solve one of the problems you're describing.
Re:preemptive coroutines (Score:1)
Excuse my gross ignorance, but would this remove the one-core limit?
Could we then use even half of my four core machine?
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Re: (Score:1)
This would totally not remove the one-core limit. But it would fix essentially all other problems. For multi-core usage, one would have to resort to an extra process.