84 lines
2.6 KiB
Go
84 lines
2.6 KiB
Go
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// Copyright (c) 2021 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package atomic
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import (
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"testing"
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"unsafe"
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"github.com/stretchr/testify/require"
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)
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func TestUnsafePointer(t *testing.T) {
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i := int64(42)
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j := int64(0)
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k := int64(1)
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tests := []struct {
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desc string
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newAtomic func() *UnsafePointer
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initial unsafe.Pointer
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}{
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{
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desc: "non-empty",
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newAtomic: func() *UnsafePointer {
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return NewUnsafePointer(unsafe.Pointer(&i))
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},
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initial: unsafe.Pointer(&i),
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},
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{
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desc: "nil",
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newAtomic: func() *UnsafePointer {
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var p UnsafePointer
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return &p
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},
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initial: unsafe.Pointer(nil),
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},
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}
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for _, tt := range tests {
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t.Run(tt.desc, func(t *testing.T) {
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t.Run("Load", func(t *testing.T) {
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atom := tt.newAtomic()
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require.Equal(t, tt.initial, atom.Load(), "Load should report nil.")
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})
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t.Run("Swap", func(t *testing.T) {
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atom := tt.newAtomic()
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require.Equal(t, tt.initial, atom.Swap(unsafe.Pointer(&k)), "Swap didn't return the old value.")
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require.Equal(t, unsafe.Pointer(&k), atom.Load(), "Swap didn't set the correct value.")
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})
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t.Run("CAS", func(t *testing.T) {
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atom := tt.newAtomic()
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require.True(t, atom.CAS(tt.initial, unsafe.Pointer(&j)), "CAS didn't report a swap.")
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require.Equal(t, unsafe.Pointer(&j), atom.Load(), "CAS didn't set the correct value.")
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})
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t.Run("Store", func(t *testing.T) {
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atom := tt.newAtomic()
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atom.Store(unsafe.Pointer(&i))
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require.Equal(t, unsafe.Pointer(&i), atom.Load(), "Store didn't set the correct value.")
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})
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})
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}
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}
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