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// 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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