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7
Concurrent Systems/notes/5 - Software Transactional Memory.md
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@ -33,8 +33,11 @@ Implementation: every transaction uses a local working space
#### A Logical Clock based STM system
All the READs perform if no inconsistencies arise, or before any inconsistency
Let T be a transaction; its read prefix is formed by all its successful READ before its possible abortion.
An execution is **opaque** if all committed transactions and all the read prefixes of all aborted transactions appear if executed one after the other, by following their real-time occurrence order.
>[!def]
>Let T be a transaction; its read prefix is formed by all its successful READ before its possible abortion.
>[!def]
>An execution is **opaque** if all committed transactions and all the read prefixes of all aborted transactions appear if executed one after the other, by following their real-time occurrence order.
We now present an atomic STM system, called *Transactional Locking 2*:
- CLOCK is an atomic READ/FETCH&ADD register initialized at 0