rust
/
nomicon
mirror of https://github.com/rust-lang/nomicon
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fixup atomics

Browse Source
pull/10/head
Alexis Beingessner 9 years ago committed by Manish Goregaokar
parent f8fdc70bc3
commit 8685cdba24
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File

6
atomics.md
Unescape View File

@ -85,12 +85,12 @@ x = 1; y *= 2;
Ideally this program has 2 possible final states: Ideally this program has 2 possible final states:
* `y = 3`: (thread 2 did the check before thread 1 completed) y = 6`: (thread 2 * `y = 3`: (thread 2 did the check before thread 1 completed)
* `did the check after thread 1 completed) * `y = 6`: (thread 2 did the check after thread 1 completed)
However there's a third potential state that the hardware enables: However there's a third potential state that the hardware enables:
* `y = 2`: (thread 2 saw `x = 2`, but not `y = 3`, and then overwrote `y = 3`) * `y = 2`: (thread 2 saw `x = 1`, but not `y = 3`, and then overwrote `y = 3`)
It's worth noting that different kinds of CPU provide different guarantees. It It's worth noting that different kinds of CPU provide different guarantees. It
is common to separate hardware into two categories: strongly-ordered and weakly- is common to separate hardware into two categories: strongly-ordered and weakly-

Write Preview
Loading…
Cancel
Save