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book: fix incorrect suggestions

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Fixes #239
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Changkun Ou
2022-07-17 12:56:56 +02:00
parent b22404503e
commit 25a8fd2bc4
2 changed files with 5 additions and 5 deletions
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book/en-us/07-thread.md
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@@ -495,7 +495,7 @@ To achieve the ultimate performance and achieve consistency of various strength
acquire.join(); acquire.join();
``` ```
In this case we used `compare_exchange_strong`, which is the Compare-and-swap primitive, which has a weaker version, `compare_exchange_weak`, which allows a failure to be returned even if the exchange is successful. The reason is due to a false failure on some platforms, specifically when the CPU performs a context switch, another thread loads the same address to produce an inconsistency. In addition, the performance of `compare_exchange_strong` may be slightly worse than `compare_exchange_weak`, but in most cases, `compare_exchange_strong` should be limited. In this case we used `compare_exchange_strong`, which is the Compare-and-swap primitive, which has a weaker version, `compare_exchange_weak`, which allows a failure to be returned even if the exchange is successful. The reason is due to a false failure on some platforms, specifically when the CPU performs a context switch, another thread loads the same address to produce an inconsistency. In addition, the performance of `compare_exchange_strong` may be slightly worse than `compare_exchange_weak`. However, in most cases, `compare_exchange_weak` is discouraged due to the complexity of its usage.
4. Sequential Consistent Model: Under this model, atomic operations satisfy sequence consistency, which in turn can cause performance loss. It can be specified explicitly by `std::memory_order_seq_cst`. Let's look at a final example: 4. Sequential Consistent Model: Under this model, atomic operations satisfy sequence consistency, which in turn can cause performance loss. It can be specified explicitly by `std::memory_order_seq_cst`. Let's look at a final example:

2
book/zh-cn/07-thread.md
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@@ -504,7 +504,7 @@ int main() {
acquire.join(); acquire.join();
``` ```
在此例中我们使用了 `compare_exchange_strong`，它便是比较交换原语（Compare-and-swap primitive），它有一个更弱的版本，即 `compare_exchange_weak`，它允许即便交换成功，也仍然返回 `false` 失败。其原因是因为在某些平台上虚假故障导致的，具体而言，当 CPU 进行上下文切换时，另一线程加载同一地址产生的不一致。除此之外，`compare_exchange_strong` 的性能可能稍差于 `compare_exchange_weak`，但大部分情况下，`compare_exchange_strong` 应该被有限考虑。 在此例中我们使用了 `compare_exchange_strong` 比较交换原语（Compare-and-swap primitive），它有一个更弱的版本，即 `compare_exchange_weak`，它允许即便交换成功，也仍然返回 `false` 失败。其原因是因为在某些平台上虚假故障导致的，具体而言，当 CPU 进行上下文切换时，另一线程加载同一地址产生的不一致。除此之外，`compare_exchange_strong` 的性能可能稍差于 `compare_exchange_weak`，但大部分情况下，鉴于其使用的复杂度而言，`compare_exchange_weak` 应该被有限考虑。
4. 顺序一致模型：在此模型下，原子操作满足顺序一致性，进而可能对性能产生损耗。可显式的通过 `std::memory_order_seq_cst` 进行指定。最后来看一个例子： 4. 顺序一致模型：在此模型下，原子操作满足顺序一致性，进而可能对性能产生损耗。可显式的通过 `std::memory_order_seq_cst` 进行指定。最后来看一个例子：