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book: fix typo in memory order acquire

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Fixes #96
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Changkun Ou
2020-04-20 08:34:16 +02:00
parent a5d1563609
commit d31da4caf9
2 changed files with 2 additions and 2 deletions
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book/en-us/07-thread.md
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@@ -462,7 +462,7 @@ In order to achieve the ultimate performance and achieve consistency of various
3. Release/Acquire model: Under this model, we can further tighten the order of atomic operations between different threads, specifying the timing between releasing `std::memory_order_release` and getting `std::memory_order_acquire`. **All** write operations before the release operation are visible to any other thread, ie, happens-before.
As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, is a backward barrier, and `std::memory_order_acquire` ensures the previous write behavior after it, no It will happen after the get operation, it is a forward barrier. For the option `std::memory_order_acq_rel`, it combines the characteristics of the two, and only determines a memory barrier, so that the current thread reads and writes to the memory. Will not be rearranged before and after this operation.
As you can see, `std::memory_order_release` ensures that the write behavior after it does not occur before the release operation, which is a backward barrier, and`std::memory_order_acquire` ensures that its previous write behavior does not occur after this acquisition operation, there is a forward barrier. For the `std::memory_order_acq_rel` option, it combines the characteristics of the two and uniquely determines a memory barrier, so that the current thread's reading and writing of memory will not be rearranged before and after this operation.
Let's check an example: