[issue35466] Use a linked list for the ceval pending calls.

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

I suppose performance could have been a motivator originally.  However, I don't see a benefit now that signals handlers are no longer pending calls.  If it's a real problem then we can leverage a free list.

As to complexity, the motivator for this change was difficulty I had (along with another core dev) in quickly understanding the logic for manipulating the circular buffer.  I find the linked list much easier to understand.

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nosy: +emilyemorehouse

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