[Python-ideas] The async API of the future: yield-from

Greg Ewing greg.ewing at canterbury.ac.nz
Mon Oct 15 08:04:16 CEST 2012

Ben Darnell wrote:

The problem is that as soon as task1 blocks on IO, the entire
> current task (which includes outer(), par(), and both children) gets
> unscheduled.  no part of task2 gets scheduled until it gets yielded
> from, because the scheduler can't see it until then.

The suggested implementation of par() that I posted does
explicitly schedule the subtasks. Then it repeatedly
yields, giving them a chance to run, until they all


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