mirror of https://go.googlesource.com/go
49 lines
977 B
Go
49 lines
977 B
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build race
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package race_test
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import (
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"fmt"
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"reflect"
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"runtime"
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"strings"
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"testing"
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)
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func TestRandomScheduling(t *testing.T) {
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// Scheduler is most consistent with GOMAXPROCS=1.
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// Use that to make the test most likely to fail.
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defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
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const N = 10
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out := make([][]int, N)
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for i := 0; i < N; i++ {
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c := make(chan int, N)
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for j := 0; j < N; j++ {
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go func(j int) {
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c <- j
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}(j)
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}
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row := make([]int, N)
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for j := 0; j < N; j++ {
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row[j] = <-c
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}
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out[i] = row
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}
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for i := 0; i < N; i++ {
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if !reflect.DeepEqual(out[0], out[i]) {
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return // found a different order
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}
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}
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var buf strings.Builder
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for i := 0; i < N; i++ {
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fmt.Fprintf(&buf, "%v\n", out[i])
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}
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t.Fatalf("consistent goroutine execution order:\n%v", buf.String())
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}
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