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fmassicano/goroutines.go

Last active January 31, 2019 21:56
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Golang practicing code
Raw
goroutines.go
package main
import (
"fmt"
"time"
)
var (
done = make(chan bool)
i int = 0
)
func say(s string, n int) {
for i := 0; i < n; i++ {
time.Sleep(100 * time.Millisecond)
fmt.Println(s)
}
}
func wrapSays(s string, n int){
i ++
go func(){say(s,n); done <- true}()
}
func Done(){
for j := 0 ; j < i ; j++ {<- done;}; fmt.Print("DONE!!!")
}
func main() {
defer Done()
wrapSays("a", 4)
wrapSays("b", 5)
wrapSays("d", 5)
}
Raw
select.go
package main
import "fmt"
func fibonacci(c, quit chan int) {
x, y := 0, 1
for { // infinit loop until 'quit' channel to be updated
select {
case c <- x: // each time that request <-c this case will be executed
x, y = y, x+y
case <-quit: // wait for 'quit' to be updated
fmt.Println("quit")
return
}
}
}
func main() {
// define a channel 'c' to store the result of fibonacci
c := make(chan int)
// define a channel 'quit' to alert the process was finished
quit := make(chan int)
// define a goroutine that will print 10 fibonacci numbers
go func() {
for i := 0; i < 10; i++ {
fmt.Println(<-c) // request the channel value 'c' ["print 10 receivers c"]
}
quit <- 0 // send 0 to channel quit to finish the program
}()
fibonacci(c, quit)
}
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