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| // Copyright 2015 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.
|
| // +build race
|
| package race_test
|
| import (
| "bytes"
| "fmt"
| "reflect"
| "runtime"
| "testing"
| )
|
| func TestRandomScheduling(t *testing.T) {
| // Scheduler is most consistent with GOMAXPROCS=1.
| // Use that to make the test most likely to fail.
| defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
| const N = 10
| out := make([][]int, N)
| for i := 0; i < N; i++ {
| c := make(chan int, N)
| for j := 0; j < N; j++ {
| go func(j int) {
| c <- j
| }(j)
| }
| row := make([]int, N)
| for j := 0; j < N; j++ {
| row[j] = <-c
| }
| out[i] = row
| }
|
| for i := 0; i < N; i++ {
| if !reflect.DeepEqual(out[0], out[i]) {
| return // found a different order
| }
| }
|
| var buf bytes.Buffer
| for i := 0; i < N; i++ {
| fmt.Fprintf(&buf, "%v\n", out[i])
| }
| t.Fatalf("consistent goroutine execution order:\n%v", buf.String())
| }
|
|
