mirror of git://gcc.gnu.org/git/gcc.git
48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
// Copyright 2016 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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package rand
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import (
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"sync"
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"testing"
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)
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// TestConcurrent exercises the rand API concurrently, triggering situations
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// where the race detector is likely to detect issues.
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func TestConcurrent(t *testing.T) {
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const (
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numRoutines = 10
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numCycles = 10
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)
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var wg sync.WaitGroup
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defer wg.Wait()
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wg.Add(numRoutines)
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for i := 0; i < numRoutines; i++ {
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go func(i int) {
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defer wg.Done()
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buf := make([]byte, 997)
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for j := 0; j < numCycles; j++ {
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var seed int64
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seed += int64(ExpFloat64())
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seed += int64(Float32())
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seed += int64(Float64())
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seed += int64(Intn(Int()))
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seed += int64(Int31n(Int31()))
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seed += int64(Int63n(Int63()))
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seed += int64(NormFloat64())
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seed += int64(Uint32())
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for _, p := range Perm(10) {
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seed += int64(p)
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}
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Read(buf)
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for _, b := range buf {
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seed += int64(b)
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}
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Seed(int64(i*j) * seed)
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}
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}(i)
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}
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}
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