golang sieve 代码
文件路径：/test/sieve.go
/ build
/ 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.
/ Test basic concurrency: the classic prime sieve.
/ Do not run - loops forever.
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()
}