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Concurrent Systems/notes/8 - Enhancing Liveness Properties.md
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@ -6,7 +6,8 @@ Can we take the most basic protocol that satisfies the most basic liveness prope
**Enriched implementation:** when a process realizes that there is contention, it invokes need_help; when it completes its current operation, it invokes stop_help. **Enriched implementation:** when a process realizes that there is contention, it invokes need_help; when it completes its current operation, it invokes stop_help.
**Why is it different from lock/unlock?** Because this allows failures, and they can also happen in the contention-free period. >[!question] Why is it different from lock/unlock?
>Because this allows failures, and they can also happen in the contention-free period.
**PROBLEM:** to distinguish a failure from a long delay, we need objects called ***failure detectors***, that provide processes information on the failed processes of the system. According to the type/quality of the info, several F.D.s can be defined. **PROBLEM:** to distinguish a failure from a long delay, we need objects called ***failure detectors***, that provide processes information on the failed processes of the system. According to the type/quality of the info, several F.D.s can be defined.