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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:14:23 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:14:23 +0000 |
commit | 73df946d56c74384511a194dd01dbe099584fd1a (patch) | |
tree | fd0bcea490dd81327ddfbb31e215439672c9a068 /src/sync/atomic/value_test.go | |
parent | Initial commit. (diff) | |
download | golang-1.16-upstream.tar.xz golang-1.16-upstream.zip |
Adding upstream version 1.16.10.upstream/1.16.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/sync/atomic/value_test.go')
-rw-r--r-- | src/sync/atomic/value_test.go | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/sync/atomic/value_test.go b/src/sync/atomic/value_test.go new file mode 100644 index 0000000..f289766 --- /dev/null +++ b/src/sync/atomic/value_test.go @@ -0,0 +1,135 @@ +// 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" + . "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 := [][]interface{}{ + {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) + } + } + }) +} |