Doesn't work. If no communication can proceed when entering the select, this degenerates to a simple select. For example, say there are no writers to any of those channels. At the same time, that the last select is entered, three different goroutines start blocking to write to one of the channels each. Even though priorityHigh could proceed, you will read from one of the other with ⅔ ​probability.
(a simpler case: Imagine that, while the goroutine is blocking in the innermost select, a second goroutines enters *the same* select, just with writes. Semantically, all three communications can proceed at the same time for both goroutines, so one is chosen uniformly) This is the fundamental problem with all the nested select solutions; they assume that the code is evaluated atomically. But in reality, the state of a communication being possible can change at any point for an arbitrary number of channels. Thus, you can always construct a sequence where you revert to the innermost select, violating c. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
