Subversion Repositories openrisc

// $G $F.go && $L $F.$A  # don't run it - goes forever

// Copyright 2009 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package main

// Send the sequence 2, 3, 4, ... to channel 'ch'.

func Generate(ch chan<- int) {

        for i := 2; ; i++ {

                ch <- i // Send 'i' to channel 'ch'.

        }

}

// Copy the values from channel 'in' to channel 'out',

// removing those divisible by 'prime'.

func Filter(in <-chan int, out chan<- int, prime int) {

        for {

                i := <-in // Receive value of new variable 'i' from 'in'.

                if i%prime != 0 {

                        out <- i // Send 'i' to channel 'out'.

                }

        }

}

// The prime sieve: Daisy-chain Filter processes together.

func Sieve() {

        ch := make(chan int) // Create a new channel.

        go Generate(ch)      // Start Generate() as a subprocess.

        for {

                prime := <-ch

                print(prime, "\n")

                ch1 := make(chan int)

                go Filter(ch, ch1, prime)

                ch = ch1

        }

}

func main() {

        Sieve()

}