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For questions about design and implementation of coroutines, a generalization of subroutines that can be paused and resumed. Indicate in the question whether the coroutines are symmetric or asymmetric, stackful or stackless, and first-class or not.
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Why can many languages' futures not be canceled?
The problem with canceling a concurrent execution that runs on another thread is that you don't know what state it is in. It is very well possible that it is currently in a phase where just interrupti …