blob: 8addea6c3c9912b65f219968ead1ca08e5eb93bc [file] [log] [blame]
// +build ignore,OMIT
package main
import "fmt"
// 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(src <-chan int, dst chan<- int, prime int) {
for i := range src { // Loop over values received from 'src'.
if i%prime != 0 {
dst <- i; // Send 'i' to channel 'dst'.
}
}
}
// BREAK OMIT
// 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;
fmt.Print(prime, "\n");
ch1 := make(chan int);
go filter(ch, ch1, prime);
ch = ch1;
}
}
func main() {
sieve();
}