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chan1.go
// run // Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Test communication with multiple simultaneous goroutines. package main import "runtime" const N = 1000 // sent messages const M = 10 // receiving goroutines const W = 2 // channel buffering var h [N]int // marking of send/recv func r(c chan int, m int) { for { select { case r := <-c: if h[r] != 1 { println("r", "m=", m, "r=", r, "h=", h[r]) panic("fail") } h[r] = 2 } } } func s(c chan int) { for n := 0; n < N; n++ { r := n if h[r] != 0 { println("s") panic("fail") } h[r] = 1 c <- r } } func main() { c := make(chan int, W) for m := 0; m < M; m++ { go r(c, m) runtime.Gosched() } runtime.Gosched() runtime.Gosched() s(c) }
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