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concurrent computation of a function

Suppose I have two functions f1(x) and f2(x) that compute the same entity. Depending on the value of x one may be much faster than the other, or vice versa. It's apriori unknown which of the two functions will be faster for a given x.

So, I'd like like to run the two functions on the given x concurrently in parallel, and as soon as one produces an answer, I'd like to terminate the other function as well and return that answer. Please help me to design such a parallelized function concurrent_run(f1,f2,x) in Sage.