Ideas for yielding and exception raising

[Calvin Spealman]

Peter Hansen wrote:

> Calvin Spealman wrote:
> 
>> I was wondering if it was possible, now or with a patch, to do either of
>> the following:
>> 
>> 1) Cause another thread's most recent function, or a given function in a
>> given thread, to yield its generator immediately, such that the generator
>> can be used to pick back up where it left off. That is, the function
>> itself wouldn't need an actually yield keyword. Could be used to allow a
>> function to be controlled in how much time it has per second or somewhat?
>> 
>> 2) Cause an exception to be raised in all threads that have a reference
>> to a given object, as if the object itself is raising the exception. This
>> would allow functions to return Monitor Objects that would raise
>> exceptions if something bad happened. For example, maybe you want the
>> function to run continually until someone else requests access to some
>> syncronized data, and the Monitor would raise the exception at that time.
> 
> Wouldn't it be better for both of these situations to do it
> explicitly and actually write the code that way?  What is
> the advantage in putting this in the core and having it
> happen magically and behind the scenes, as it appears you
> want to happen?
> 
> -Peter

How would/could I do this explicitly?
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