Would it be possible to make a cancelable version of
DispatchQueue.concurrentPerform, allowing you to abort any yet-to-be-scheduled
blocks?
The use-case is for when you’re concurrently performing a job and one of them
sets a flag or fails in a way which already defines the result. Further
execution wouldn’t affect the outcome, so it would be nice if an operation
could flag back to concurrentPerform that it doesn’t have to schedule any more
jobs.
For a real-world example, see this concurrent RandomAccessCollection wrapper I
was building: https://gist.github.com/karwa/43ae838809cc68d317003f2885c71572
<https://gist.github.com/karwa/43ae838809cc68d317003f2885c71572>
It would be beneficial if we could stop early in the case of errors (see:
_forEach), or if some global flag is set (see: contains).
- Karl
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