blob: 6b53b1b727c6b61ed7f46fa810a6ad4acd102dc1 [file] [log] [blame]
// +build ignore,OMIT
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'.
}
}
}
// 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;
print(prime, "\n");
ch1 := make(chan int);
go Filter(ch, ch1, prime);
ch = ch1
}
}
func main() {
Sieve()
}