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
2
670
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
2k
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
940
AVAudioEngineでリアルタイムレンダリング
objectiveaudio
1
820
リファクタリング・チャレンジ リバーシ編
objectiveaudio
0
160
UIKitは2度ベルを鳴らす
objectiveaudio
0
300
iOSDC2018.pdf
objectiveaudio
1
2.1k
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
Is Xcode slowly dying out in 2025?
uetyo
1
260
A2A プロトコルを試してみる
azukiazusa1
2
1.3k
Team topologies and the microservice architecture: a synergistic relationship
cer
PRO
0
1.2k
ペアプロ × 生成AI 現場での実践と課題について / generative-ai-in-pair-programming
codmoninc
1
14k
既存デザインを変更せずにタップ領域を広げる方法
tahia910
1
280
システム成長を止めない!本番無停止テーブル移行の全貌
sakawe_ee
1
160
What Spring Developers Should Know About Jakarta EE
ivargrimstad
0
420
Discover Metal 4
rei315
2
120
Systèmes distribués, pour le meilleur et pour le pire - BreizhCamp 2025 - Conférence
slecache
0
120
AI時代のソフトウェア開発を考える(2025/07版) / Agentic Software Engineering Findy 2025-07 Edition
twada
PRO
67
20k
Flutterで備える!Accessibility Nutrition Labels完全ガイド
yuukiw00w
0
150
Node-RED を(HTTP で)つなげる MCP サーバーを作ってみた
highu
0
120
Featured
See All Featured
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
281
13k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
20
1.3k
Six Lessons from altMBA
skipperchong
28
3.9k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Making Projects Easy
brettharned
116
6.3k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
31
1.3k
How GitHub (no longer) Works
holman
314
140k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
5
250
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
138
34k
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