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37 lines
762 B
37 lines
762 B
// A concurrent prime sieve
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package main
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import "fmt"
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// Send the sequence 2, 3, 4, ... to channel 'ch'.
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func Generate(ch chan<- int) {
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for i := 2; ; i++ {
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ch <- i // Send 'i' to channel 'ch'.
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}
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}
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// Copy the values from channel 'in' to channel 'out',
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// removing those divisible by 'prime'.
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func Filter(in <-chan int, out chan<- int, prime int) {
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for {
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i := <-in // Receive value from 'in'.
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if i%prime != 0 {
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out <- i // Send 'i' to 'out'.
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}
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}
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}
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// The prime sieve: Daisy-chain Filter processes.
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func main() {
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ch := make(chan int) // Create a new channel.
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go Generate(ch) // Launch Generate goroutine.
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for i := 0; i < 10; i++ {
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prime := <-ch
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fmt.Println(prime)
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ch1 := make(chan int)
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go Filter(ch, ch1, prime)
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ch = ch1
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}
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}
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