Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Swift Concurrencyとレースコンディション
Search
Yuki Yasoshima
August 25, 2024
Programming
1
580
Swift Concurrencyとレースコンディション
After iOSDC Japan 2024
2024/8/26
Yuki Yasoshima
August 25, 2024
Tweet
Share
More Decks by Yuki Yasoshima
See All by Yuki Yasoshima
モーダルの遷移を理解する
objectiveaudio
4
1.8k
オーディオ波形を表示するために知っておくべきこと
objectiveaudio
0
890
AVAudioEngineでリアルタイムレンダリング
objectiveaudio
1
750
リファクタリング・チャレンジ リバーシ編
objectiveaudio
0
140
UIKitは2度ベルを鳴らす
objectiveaudio
0
290
iOSDC2018.pdf
objectiveaudio
1
2k
Objective-C++を使ってMRCで快適に開発する
objectiveaudio
0
22k
Other Decks in Programming
See All in Programming
pylint custom ruleで始めるレビュー自動化
shogoujiie
0
150
Kubernetes History Inspector(KHI)を触ってみた
bells17
0
250
Open source software: how to live long and go far
gaelvaroquaux
0
660
技術を改善し続ける
gumioji
0
110
責務と認知負荷を整える! 抽象レベルを意識した関心の分離
yahiru
8
1.3k
Amazon Q Developer Proで効率化するAPI開発入門
seike460
PRO
0
120
XStateを用いた堅牢なReact Components設計~複雑なClient Stateをシンプルに~ @React Tokyo ミートアップ #2
kfurusho
1
970
メンテが命: PHPフレームワークのコンテナ化とアップグレード戦略
shunta27
0
300
2025.2.14_Developers Summit 2025_登壇資料
0101unite
0
180
dbt Pythonモデルで実現するSnowflake活用術
trsnium
0
250
パスキーのすべて ── 導入・UX設計・実装の紹介 / 20250213 パスキー開発者の集い
kuralab
3
880
Go 1.24でジェネリックになった型エイリアスの紹介
syumai
2
280
Featured
See All Featured
The Cult of Friendly URLs
andyhume
78
6.2k
Why Our Code Smells
bkeepers
PRO
336
57k
Agile that works and the tools we love
rasmusluckow
328
21k
Typedesign – Prime Four
hannesfritz
40
2.5k
Six Lessons from altMBA
skipperchong
27
3.6k
Reflections from 52 weeks, 52 projects
jeffersonlam
348
20k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
The Power of CSS Pseudo Elements
geoffreycrofte
75
5.5k
What's in a price? How to price your products and services
michaelherold
244
12k
The Language of Interfaces
destraynor
156
24k
What’s in a name? Adding method to the madness
productmarketing
PRO
22
3.3k
Rails Girls Zürich Keynote
gr2m
94
13k
Transcript
:VLJ:BTPTIJNB!ZBTP@TBO 4XJGU$PODVSSFODZͱ ϨʔείϯσΟγϣϯ "GUFSJ04%$+BQBO
ඇಉظॲཧͰى͖Δ w σʔλڝ߹ w ϨʔείϯσΟγϣϯ ؒҧͬͨίʔυΛॻ͍ͯେͳ͘ಈ͍ͯ͠·͏
4XJGU$PODVSSFODZͰʁ w 4XJGU$PODVSSFODZ͕ίϯύΠϧ࣌ʹอূ͢Δͷσʔλڝ߹·Ͱ w ϨʔείϯσΟγϣϯͷɺ ҎલͱมΘΒ࣮ͣऀ͕ؾΛ͚ͭΔඞཁ͕͋Δ
4XJGU$PODVSSFODZͷΈ w "DUPSSFFOUSBODZʢ"DUPSͷ࠶ೖՄೳੑʣ w $PPQFSBUJWF5ISFBE1PPMʢڠௐతεϨουϓʔϧʣ
nonisolated func asyncMethod(_ value: Int) async -> Int { ...
} ... Task { @MainActor in let value = makeValue() let result = await asyncMethod(value) print("result : \(result)") } ॲཧ͕ܧଓ࣮ͯ͠ߦ͞ΕΔ୯Ґ ᶃ ᶄ ᶅ ᶃϝΠϯ ᶄ#( ᶅϝΠϯ 4VTQFOUJPO1PJOU εϨου $POUJOVBUJPO ϝΠϯ
nonisolated func asyncMethod(_ value: Int) async -> Int { ...
} ... Task { @MainActor in let value = makeValue() let result = await asyncMethod(value) print("result : \(result)") } ॲཧ͕ܧଓ࣮ͯ͠ߦ͞ΕΔ୯Ґ ᶃ ᶄ ᶅ ᶃϝΠϯ ᶄ ᶅϝΠϯ 4VTQFOUJPO1PJOU εϨου $POUJOVBUJPO ᶄ ᶄ
$PPQFSBUJWF5ISFBE1PPM ڠௐతεϨουϓʔϧ εϨου εϨου ࣮ߦͪ "DUPSᶃ "DUPSᶄ /PO*TPMBUFE Task {
@MainActor in let value = makeValue() let result = await asyncMethod(value) return "fetched : " + result } Task { } 5BTLͷ࣮ߦ
nonisolated func method() { ᶃ Task.detached { ᶄ } Task.detached
{ ᶅ } ᶆ } ࣮ߦ͞ΕΔॱ൪ w ᶄɺᶅɺᶆฒྻͰ࣮ߦ͞ ΕΔ શͯ/PO*TPMBUFEͷ߹ ᶃ ᶆ ᶄ ᶅ εϨου
nonisolated func method() { ᶃ Task.detached { ᶄ } Task.detached
{ ᶅ } ᶆ } ࣮ߦ͞ΕΔॱ൪ w ᶄɺᶅɺᶆฒྻͰ࣮ߦ͞ ΕΔ w ᶆͷޙʹᶄɺᶅ͕ಉ͡εϨ ουͷՄೳੑͳ͘ͳ͍ શͯ/PO*TPMBUFEͷ߹ ᶃ ᶆ ᶄ ᶅ εϨου ᶄ ᶅ
@MyActor func method() { ᶃ Task { @MyActor in ᶄ
} Task { @MyActor in ᶅ } ᶆ } w ·ͣᶃɺᶆ͕࣮ߦ͞ΕΔ w ᶄɺᶅ ฒྻʹ࣮ߦ͞Εͳ͍͕ ͲͪΒ͔Β ࣮ߦ͞ΕΔ͔Θ͔Βͳ͍ ࣮ߦ͞ΕΔॱ൪ ಉ͡"DUPSͷ߹ εϨου ᶃ ᶆ ᶄ ᶅ ᶄ ᶅ ʁ
ͷ͋ΔίʔυΛվળ͢Δ
ͷ͋Δίʔυྫ λοϓͨ͠ͷϩάΛૹΔ w λοϓ͢ΔͨͼʹϩʔΧϧʹอ͍࣋ͯ͠ΔΛ૿͢ w ఆظతʹΛαʔόʔʹૹ৴͢Δ w ૹ৴ͨ͠ΒϩʔΧϧͷΛϦηοτ͢Δ
ͷ͋Δίʔυྫ actor Counter { var count: Int = 0 func
increment() { count += 1 } func reset() { count = 0 } } class CountLogger { private let counter = Counter() func increment() async { await counter.increment() } // ఆظతʹؒΛ͓͍ͯݺΕΔఆ func post() async { let count = await counter.count await postCountLog(count) await counter.reset() } }
class CountLogger { func increment() async { ... } ...
func post() async { let count = await counter.count await postCountLog(count) await counter.reset() } } w DPVOUऔಘ͔ͯ͠ΒSFTFU͢Δ·ͰͷؒʹJODSFNFOU ͕ݺΕΔͱ ͦͷ૿ՃQPTU͞ΕͣʹSFTFU͞ΕΔ
class CountLogger { func increment() async { ... } ...
func post() async { let count = await counter.count await counter.reset() await postCountLog(count) } } w DPVOUऔಘޙʹ͙͢SFTFUͯ͠ɺ 4VTQFOUJPO1PJOUͰJODSFNFOU͕ݺΕΔՄೳੑ͕͋Δ
actor CountLogger { func increment() async { ... } ...
func post() async { let count = await counter.count await counter.reset() await postCountLog(count) } } w BDUPSʹͯ͠4VTQFOUJPO1PJOU͕ೖΔ͜ͱมΘΒͳ͍
վળͨ͠ίʔυ actor Counter { private var count: Int = 0
func increment() { count += 1 } func pull() -> Int { let count = self.count self.count = 0 return count } } actor CountLogger { private let counter = Counter() func increment() async { await counter.increment() } // ఆظతʹؒΛ͓͍ͯݺΕΔఆ func post() async { let count = await counter.pull() await postCountLog(count) } }
actor Counter { private var count: Int = 0 ...
func pull() -> Int { let count = self.count self.count = 0 return count } } w DPVOUͷऔಘͱϦηοτΛBDUPSͷϝιουͭͰߦ͏͜ͱͰ 4VTQFOUJPO1PJOU͕ೖΔ͜ͱͳ͘ͳΔ
αϯϓϧͷ༷มߋ λοϓͨ͠ͷϩάΛૹΓ߹ܭΛදࣔ w λοϓ͢ΔͨͼʹϩʔΧϧʹอ͍࣋ͯ͠ΔΛ૿͢ w ఆظతʹΛαʔόʔʹૹ৴͢Δ w ૹ৴ͨ͠ΒϩʔΧϧͷΛϦηοτ͢Δ w ૹ৴࣌ʹαʔόʔ͔Β߹ܭΛฦ͠දࣔ͢Δ
/FX
func post() async -> Int { let count = await
counter.pull() let total = await postCountLog(count) return total } w ಉ࣌ʹݺΕΔͱɺޙ͔ΒݺΜͩํ͕ઌʹऴΘΔՄೳੑ͕͋Δ w BDUPS͕ಉ͡Ͱؔͳ͍ func post() async -> Int { let count = await counter.pull() let total = await postCountLog(count) return total } ઌʹݺΜͩॲཧ ޙ͔ΒݺΜͩॲཧ
w ݺͼग़͢λΠϛϯά͕ॏෳ͢Δͱ͕ى͖ΔՄೳੑ͕͋Δ Task { let total = await logger.post() print("total
: \(total)") } ͱΓ͋͑ͣ5BTL ❓
5JNFSͰ5BTLΛ܁Γฦ࣮͠ߦ w QPTUͷॲཧ͕5JNFSͷJOUFSWBMΛ͑Δͱɺ QPTUͷॲཧ͕ॏෳ͢ΔՄೳੑ͕͋Δ Timer.scheduledTimer(withTimeInterval: 10, repeats: true) { _
in Task { let total = await logger.post() print("total : \(total)") } } ❌
w 5BTLͷதͰϧʔϓ͢ΕɺQPTUͷॲཧॏෳ͠ͳ͍ Task { while true { await logger.post() print("total
: \(total)") try await Task.sleep(for: .seconds(10)) } } 5BTLͰ܁Γฦ࣮͠ߦ
αϯϓϧͷ༷มߋ λοϓͨ͠ͷϩάΛૹΓ߹ܭΛදࣔ w λοϓ͢ΔͨͼʹϩʔΧϧʹอ͍࣋ͯ͠ΔΛ૿͢ w ఆظతʹΛαʔόʔʹૹ৴͢Δ w ૹ৴ͨ͠ΒϩʔΧϧͷΛϦηοτ͢Δ w ૹ৴࣌ʹαʔόʔ͔Β߹ܭΛฦ͠දࣔ͢Δ
w ࣗ༝ͳλΠϛϯάͰΛαʔόʔʹૹ৴͢Δ /FX
var isProcessing: Bool = false func post() { Task {
guard !isProcessing else { return } isProcessing = true let total = await logger.post() print("total : \(total)”) isProcessing = false } } ˞"DUPSಉ͡ఆ ඇಉظॲཧͷॏෳΛεΩοϓ
w ࣮ߦͤͣɺผ5BTLͰඇಉظॲཧ͕ྻʹ࣮ߦ͞ΕΔΑ͏ʹ͢Δ w ͨͩ͠ɺݺͼग़͠ଆ͕࣮ࡍͷඇಉظॲཧͷྃΛͭ͜ͱͰ͖ͳ͍ let channel: AsyncChannel<Void> Task { for
await _ in channel { let total = await logger.post() print("total : \(total)") } } Task { await channel.send(()) } "TZOD$IBOOFMΛ͏
·ͱΊ 4XJGU$PODVSSFODZͱϨʔείϯσΟγϣϯ w 4XJGU$PODVSSFOUZϨʔείϯσΟγϣϯΛ͍Ͱ͘ΕΔͷͰͳ͍ w Ή͠ΖޮΛ༏ઌͯ͠Λى͍͜͢͠Έʹͳ͍ͬͯΔ w "DUPSSFFOUSBODZ w ಉ͡BDUPSಉ࢜ͷॲཧͰɺBXBJUͰڬΈࠐ·ΕΔՄೳੑ͕͋Δ
w $PPQFSBUJWF5ISFBE1PPM w εϨουͰ࣮ߦ͞ΕΔॱ൪ɺ࣮ߦ։࢝͠Α͏ͱͨ͠ॱ൪ͱݶΒͳ͍
·ͱΊ ϨʔείϯσΟγϣϯͷରԠ w ہॴతʹҰͭͷBDUPSͷதͰBTZODؔΛΘͣʹ Ͳ͏ݺΕͯෆ߹͕ى͖ͳ͍ঢ়ଶΛ࡞Δ w BTZODؔΛΈ߹Θͤͳ͍ͱ͍͚ͳ͚Εɺ ΫϦςΟΧϧηΫγϣϯ͕ಉ࣌ʹ࣮ߦ͞Εͳ͍Α͏ʹߟྀ࣮ͯ͢͠Δ
ࢀߟ w 88%$ w .FFUBTZODBXBJUJO4XJGU w 1SPUFDUNVUBCMFTUBUFXJUI4XJGUBDUPST w 4XJGUDPODVSSFODZ#FIJOEUIFTDFOFT