Here's an excerpt from a piece of concurrent code I like, an unpublished
interactive game of life. The select near the bottom has only two cases but
it is perhaps instructive. I leave its analysis to the reader.
-rob
var kbdC chan of rune = ... // events from keyboard
var ticker = time.NewTicker(*deltaTFlag)
...
pauseC := make(chan int)
go func() {
for {
switch <-kbdC {
case 'q':
os.Exit(0)
case ' ':
pauseC <- 1
}
}
}()
gen := 0
for gen = 1; ; gen++ {
b.draw(display, *cellSizeFlag)
changed := b.step()
if !changed {
break
}
select {
case <-ticker.C:
case <-pauseC:
<-pauseC
}
}
fmt.Fprintln(os.Stderr, "stable after", gen, "generations")
select {}
}
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