John McCall 8ac4362754 Implement a simple library for task cancellation and status management. ...

There are things about this that I'm far from sold on.  In
particular, I'm concerned that in order to implement escalation
correctly, we're going to have to add a status record for the
fact that the task is being executed, which means we're going
to have to potentially wait to acquire the status lock; overall,
that means making an extra runtime function call and doing some
atomics whenever we resume or suspend a task, which is an
uncomfortable amount of overhead.

The testing here is pretty grossly inadequate, but I wanted to
lay down the groundwork here.

2020-10-15 00:36:36 -04:00

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