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Update SyncPrim/linux-sync-2.md

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Fix description error of __raw_cmpxchg
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salmon 2021-03-17 17:05:00 +08:00
parent 2ad1272085
commit 39047db890
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SyncPrim/linux-sync-2.md
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@ -244,7 +244,7 @@ Looks pretty easy, except for the `queued_spin_lock_slowpath` function. We see t
}) })
``` ```
which compares the `old` with the value pointed to by `ptr`. If they differ, it stores the `new` in the memory location which is pointed by the `ptr` and returns the initial value in this memory location. which compares the `old` with the value pointed to by `ptr`. If they are equal, it stores the `new` in the memory location which is pointed by the `ptr` and returns the initial value in this memory location.
Let's back to the `queued_spin_lock` function. Assuming that we are the first one who tried to acquire the lock, the `val` will be zero and we will return from the `queued_spin_lock` function: Let's back to the `queued_spin_lock` function. Assuming that we are the first one who tried to acquire the lock, the `val` will be zero and we will return from the `queued_spin_lock` function: