30 lines
641 B
Go
30 lines
641 B
Go
// bulma/atomic_pointer.go
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package main
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import (
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"fmt"
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"sync/atomic"
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)
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type Node struct {
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Value int
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Next *Node
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}
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func main() {
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var head atomic.Pointer[Node]
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head.Store(&Node{Value: 10})
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// 原子替换头节点
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old := head.Swap(&Node{Value: 20})
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fmt.Printf("✅ 旧头节点值: %d\n", old.Value)
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fmt.Printf("✅ 新头节点值: %d\n", head.Load().Value)
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// CAS 安全更新（仅当当前值为预期时才更新）
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if head.CompareAndSwap(&Node{Value: 20}, &Node{Value: 30}) {
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fmt.Println("✅ CAS 成功：头节点更新为 30")
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} else {
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fmt.Println("❌ CAS 失败：头节点已被其他 goroutine 修改")
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}
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}
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