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