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comparison src/chan.go @ 38:05bdd37e3000

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add channel-sample.
author pyon@macmini
date Sat, 11 Jan 2020 17:00:30 +0900
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37:43adde439537 38:05bdd37e3000
1 package main
2
3 import (
4 "fmt"
5 "time"
6 )
7
8 func main() {
9 fmt.Println("- Channel Test with Fibonacci -")
10 var t time.Time
11 n, nfib := 0, 0
12
13 n, t = 25, time.Now()
14 nfib = fib(n)
15 fmt.Printf("n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
16
17 n, t = 45, time.Now()
18 nfib = fib(n)
19 fmt.Printf("n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
20
21 fmt.Println()
22 fmt.Println("- Channel Test with Fibonacci #2 -")
23 ch1 := make(chan int)
24 ch2 := make(chan int)
25
26 n, t = 45, time.Now()
27 go func(n int) {
28 nfib := fib(n)
29 fmt.Printf("goroutine: n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
30 ch1 <- nfib
31 }(n)
32
33 n, t = 25, time.Now()
34 go func(n int) {
35 nfib := fib(n)
36 fmt.Printf("goroutine: n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
37 ch2 <- nfib
38 }(n)
39
40 n, t = 35, time.Now()
41 nfib = fib(n)
42 fmt.Printf(" - : n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
43
44 <- ch1
45 <- ch2
46
47 n, t = 5, time.Now()
48 nfib = fib(n)
49 fmt.Printf(" - : n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
50
51 fmt.Println("- End -")
52 }
53
54 func fib(x int) int {
55 if x < 2 {
56 return x
57 }
58 return fib(x - 1) + fib(x - 2)
59 }
60