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Marco Realacci 2025-03-24 08:39:23 +01:00
parent 151e0612f0
commit dc8a303757
2 changed files with 8 additions and 4 deletions
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8
.obsidian/workspace.json vendored
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@ -36,9 +36,9 @@
"type": "pdf", "type": "pdf",
"state": { "state": {
"file": "Concurrent Systems/slides/class 6.pdf", "file": "Concurrent Systems/slides/class 6.pdf",
"page": 8, "page": 9,
"left": -23, "left": -23,
"top": 568, "top": 594,
"zoom": 0.6805225653206651 "zoom": 0.6805225653206651
}, },
"icon": "lucide-file-text", "icon": "lucide-file-text",
@ -218,10 +218,10 @@
"companion:Toggle completion": false "companion:Toggle completion": false
} }
}, },
"active": "6c846cff8fe1d071", "active": "105f7a61963f10e7",
"lastOpenFiles": [ "lastOpenFiles": [
"Concurrent Systems/notes/6a - Alternatives to Atomicity.md",
"Concurrent Systems/slides/class 6.pdf", "Concurrent Systems/slides/class 6.pdf",
"Concurrent Systems/notes/6a - Alternatives to Atomicity.md",
"Pasted image 20250324082545.png", "Pasted image 20250324082545.png",
"Pasted image 20250324082534.png", "Pasted image 20250324082534.png",
"Concurrent Systems/notes/6 - Atomicity.md", "Concurrent Systems/notes/6 - Atomicity.md",

4
Concurrent Systems/notes/6a - Alternatives to Atomicity.md
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@ -13,4 +13,8 @@ Consider for example the following two processes:
p1: Q.enq(a); Q'.enq(b'); Q'deq()->b' p1: Q.enq(a); Q'.enq(b'); Q'deq()->b'
p2: Q'.enq(a'); Q.enq(b); Q.deq()->b p2: Q'.enq(a'); Q.enq(b); Q.deq()->b
``` ```
In isolation, both processes are sequentially consistent.
However, no total order on the previous 6 operations respects the semantics of a queue:
- if p1 receives b' from Q'.deq, we have that Q'.enq(a'), must arrive after Q'.enq(b')
- to respect $\to_{proc}$