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code_harris_michael_find.v
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code_harris_michael_find.v
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From smr.lang Require Import notation.
From smr.hazptr Require Import spec_hazptr code_harris_operations.
From iris.prelude Require Import options.
Section harris_michael_find.
Variable (hazptr : hazard_pointer_code).
Definition hm_find_inner : val :=
rec: "loop" "domain" "key" "prev" "curr" "prev_sh" "curr_sh" :=
hazptr.(shield_set) "curr_sh" "curr";;
let: "p" := NewProph in
let: "curr_new" := !("prev" +ₗ #next) in
if: (tag "curr_new") ≠ #0 then
("prev_sh", "curr_sh", NONE)
else if: "curr_new" ≠ ("curr") then
"loop" "domain" "key" "prev" "curr_new" "prev_sh" "curr_sh"
else
let: "next" := !("curr" +ₗ #next) in
let: "tagged" := (tag "next") ≠ #0 in
resolve_proph: "p" to: "tagged" ;;
if: "tagged" then
(if: CAS ("prev" +ₗ #next) "curr" (untag "next") then
hazptr.(hazard_domain_retire) "domain" "curr" #nodeSize;;
"loop" "domain" "key" "prev" (untag "next") "prev_sh" "curr_sh"
else
("prev_sh", "curr_sh", NONE))
else
let: "curr_key" := !("curr" +ₗ #key) in
if: "curr_key" < "key" then
"loop" "domain" "key" "curr" "next" "curr_sh" "prev_sh"
else
("prev_sh", "curr_sh", SOME ("curr_key" = "key", "prev", "curr"))
.
Definition hm_find : val :=
rec: "loop" "list" "domain" "key" "prev_sh" "curr_sh" :=
let: "prev" := !("list" +ₗ #head) in
let: "curr" := !("prev" +ₗ #next) in
hazptr.(shield_set) "prev_sh" "prev";;
let: "sh_res" := hm_find_inner "domain" "key" "prev" "curr" "prev_sh" "curr_sh" in
let: "o_res" := Snd "sh_res" in
let: "sh" := Fst "sh_res" in
match: "o_res" with
NONE => "loop" "list" "domain" "key" (Fst "sh") (Snd "sh")
| SOME "res" => ((Fst "sh"), (Snd "sh"), "res")
end
.
End harris_michael_find.