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// Copyright 2014 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 atomic_test import ( "math/rand" "runtime" "strconv" "sync" "sync/atomic" . "sync/atomic" "testing" ) func TestValue(t *testing.T) { var v Value if v.Load() != nil { t.Fatal("initial Value is not nil") } v.Store(42) x := v.Load() if xx, ok := x.(int); !ok || xx != 42 { t.Fatalf("wrong value: got %+v, want 42", x) } v.Store(84) x = v.Load() if xx, ok := x.(int); !ok || xx != 84 { t.Fatalf("wrong value: got %+v, want 84", x) } } func TestValueLarge(t *testing.T) { var v Value v.Store("foo") x := v.Load() if xx, ok := x.(string); !ok || xx != "foo" { t.Fatalf("wrong value: got %+v, want foo", x) } v.Store("barbaz") x = v.Load() if xx, ok := x.(string); !ok || xx != "barbaz" { t.Fatalf("wrong value: got %+v, want barbaz", x) } } func TestValuePanic(t *testing.T) { const nilErr = "sync/atomic: store of nil value into Value" const badErr = "sync/atomic: store of inconsistently typed value into Value" var v Value func() { defer func() { err := recover() if err != nilErr { t.Fatalf("inconsistent store panic: got '%v', want '%v'", err, nilErr) } }() v.Store(nil) }() v.Store(42) func() { defer func() { err := recover() if err != badErr { t.Fatalf("inconsistent store panic: got '%v', want '%v'", err, badErr) } }() v.Store("foo") }() func() { defer func() { err := recover() if err != nilErr { t.Fatalf("inconsistent store panic: got '%v', want '%v'", err, nilErr) } }() v.Store(nil) }() } func TestValueConcurrent(t *testing.T) { tests := [][]any{ {uint16(0), ^uint16(0), uint16(1 + 2<<8), uint16(3 + 4<<8)}, {uint32(0), ^uint32(0), uint32(1 + 2<<16), uint32(3 + 4<<16)}, {uint64(0), ^uint64(0), uint64(1 + 2<<32), uint64(3 + 4<<32)}, {complex(0, 0), complex(1, 2), complex(3, 4), complex(5, 6)}, } p := 4 * runtime.GOMAXPROCS(0) N := int(1e5) if testing.Short() { p /= 2 N = 1e3 } for _, test := range tests { var v Value done := make(chan bool, p) for i := 0; i < p; i++ { go func() { r := rand.New(rand.NewSource(rand.Int63())) expected := true loop: for j := 0; j < N; j++ { x := test[r.Intn(len(test))] v.Store(x) x = v.Load() for _, x1 := range test { if x == x1 { continue loop } } t.Logf("loaded unexpected value %+v, want %+v", x, test) expected = false break } done <- expected }() } for i := 0; i < p; i++ { if !<-done { t.FailNow() } } } } func BenchmarkValueRead(b *testing.B) { var v Value v.Store(new(int)) b.RunParallel(func(pb *testing.PB) { for pb.Next() { x := v.Load().(*int) if *x != 0 { b.Fatalf("wrong value: got %v, want 0", *x) } } }) } var Value_SwapTests = []struct { init any new any want any err any }{ {init: nil, new: nil, err: "sync/atomic: swap of nil value into Value"}, {init: nil, new: true, want: nil, err: nil}, {init: true, new: "", err: "sync/atomic: swap of inconsistently typed value into Value"}, {init: true, new: false, want: true, err: nil}, } func TestValue_Swap(t *testing.T) { for i, tt := range Value_SwapTests { t.Run(strconv.Itoa(i), func(t *testing.T) { var v Value if tt.init != nil { v.Store(tt.init) } defer func() { err := recover() switch { case tt.err == nil && err != nil: t.Errorf("should not panic, got %v", err) case tt.err != nil && err == nil: t.Errorf("should panic %v, got ", tt.err) } }() if got := v.Swap(tt.new); got != tt.want { t.Errorf("got %v, want %v", got, tt.want) } if got := v.Load(); got != tt.new { t.Errorf("got %v, want %v", got, tt.new) } }) } } func TestValueSwapConcurrent(t *testing.T) { var v Value var count uint64 var g sync.WaitGroup var m, n uint64 = 10000, 10000 if testing.Short() { m = 1000 n = 1000 } for i := uint64(0); i < m*n; i += n { i := i g.Add(1) go func() { var c uint64 for new := i; new < i+n; new++ { if old := v.Swap(new); old != nil { c += old.(uint64) } } atomic.AddUint64(&count, c) g.Done() }() } g.Wait() if want, got := (m*n-1)*(m*n)/2, count+v.Load().(uint64); got != want { t.Errorf("sum from 0 to %d was %d, want %v", m*n-1, got, want) } } var heapA, heapB = struct{ uint }{0}, struct{ uint }{0} var Value_CompareAndSwapTests = []struct { init any new any old any want bool err any }{ {init: nil, new: nil, old: nil, err: "sync/atomic: compare and swap of nil value into Value"}, {init: nil, new: true, old: "", err: "sync/atomic: compare and swap of inconsistently typed values into Value"}, {init: nil, new: true, old: true, want: false, err: nil}, {init: nil, new: true, old: nil, want: true, err: nil}, {init: true, new: "", err: "sync/atomic: compare and swap of inconsistently typed value into Value"}, {init: true, new: true, old: false, want: false, err: nil}, {init: true, new: true, old: true, want: true, err: nil}, {init: heapA, new: struct{ uint }{1}, old: heapB, want: true, err: nil}, } func TestValue_CompareAndSwap(t *testing.T) { for i, tt := range Value_CompareAndSwapTests { t.Run(strconv.Itoa(i), func(t *testing.T) { var v Value if tt.init != nil { v.Store(tt.init) } defer func() { err := recover() switch { case tt.err == nil && err != nil: t.Errorf("got %v, wanted no panic", err) case tt.err != nil && err == nil: t.Errorf("did not panic, want %v", tt.err) } }() if got := v.CompareAndSwap(tt.old, tt.new); got != tt.want { t.Errorf("got %v, want %v", got, tt.want) } }) } } func TestValueCompareAndSwapConcurrent(t *testing.T) { var v Value var w sync.WaitGroup v.Store(0) m, n := 1000, 100 if testing.Short() { m = 100 n = 100 } for i := 0; i < m; i++ { i := i w.Add(1) go func() { for j := i; j < m*n; runtime.Gosched() { if v.CompareAndSwap(j, j+1) { j += m } } w.Done() }() } w.Wait() if stop := v.Load().(int); stop != m*n { t.Errorf("did not get to %v, stopped at %v", m*n, stop) } }