Created
February 8, 2018 14:52
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Demonstration of channel ordered receives
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package main | |
import ( | |
"fmt" | |
"sync" | |
) | |
type element struct { | |
Goroutine int | |
Index int | |
} | |
func main() { | |
n := 10 | |
list := []element{} | |
ch := make(chan int) | |
var wg sync.WaitGroup | |
var mu sync.Mutex | |
wg.Add(n) | |
for i := 1; i <= n; i++ { | |
go func(i int) { | |
mu.Lock() | |
list = append(list, element{i, <-ch}) | |
mu.Unlock() | |
wg.Done() | |
}(i) | |
} | |
for i := 1; i <= 10; i++ { | |
ch <- i | |
} | |
wg.Wait() | |
for _, e := range list { | |
fmt.Println(e.Index, "added by", e.Goroutine) | |
} | |
} |
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# first run | |
1 added by 10 | |
2 added by 1 | |
3 added by 2 | |
4 added by 3 | |
5 added by 4 | |
6 added by 5 | |
7 added by 6 | |
8 added by 7 | |
9 added by 8 | |
10 added by 9 | |
# second run | |
1 added by 2 | |
2 added by 8 | |
3 added by 10 | |
4 added by 4 | |
5 added by 3 | |
6 added by 7 | |
7 added by 5 | |
8 added by 1 | |
9 added by 9 | |
10 added by 6 |
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