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Timothy-Liuxf avatar Timothy-Liuxf commented on May 19, 2024

这种情况对象应该声明为 volatile，应该属于第 10746 行和第 6507 行说明的情况吧。

safe-rules/c-cpp-rules.md

Lines 10740 to 10746 in d06e2da

对于内存中的数据，写入之后应被读取，如果出现：
1. 写入后未经读取再次被无条件写入
2. 写入后未经读取即结束了函数的执行
这种写入是无效的，出现这种问题往往意味着逻辑错误或功能不完整。
对象在初始化时的写入和 volatile 型数据可不受本规则限制。

safe-rules/c-cpp-rules.md

Lines 6502 to 6510 in d06e2da

应在适当的场景中合理使用 volatile，否则会导致优化或同步相关的多种问题。
只应在以下场景使用 volatile：
- 与汇编等语言混合处理同一对象
- 信号或中断处理函数处理共享对象
- 对象地址对应外设地址
- 出于安全目的清理内存中的对象
在这些场景中，如果相关对象没有用 volatile 限定，会导致程序和预期不符，volatile 关键字可以保证对象具有稳定的内存地址，任何读取或写入都可以来源于或作用于内存中的实际数据。

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onionblack avatar onionblack commented on May 19, 2024

也是，那我先关了，我们有一段代码是这样的

while (1) {
  port = 0;
  port = 1;
}

不过port是个对象等号是重载的

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brotherbeer avatar brotherbeer commented on May 19, 2024

嗯嗯，可以强调一下“存在写入数据之外的副作用时，可不受本规则约束”

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