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semaphore.ts
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node_modules | |
dist |
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{ | |
"devDependencies": { | |
"@types/node": "^20.12.7", | |
"ts-node": "^10.9.2", | |
"typescript": "^5.4.5" | |
} | |
} |
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(Symbol as any).dispose ??= Symbol("Symbol.dispose"); | |
(Symbol as any).asyncDispose ??= Symbol("Symbol.asyncDispose"); | |
class Semaphore { | |
private callbacks; | |
public constructor(private n: number) { | |
this.callbacks = [] as (() => void)[]; | |
} | |
public async acquire() { | |
if (this.n <= 0) { | |
await new Promise<void>((resolve) => this.callbacks.push(() => resolve())); | |
} | |
this.n -= 1; | |
return { | |
[Symbol.dispose]: () => { | |
this.n += 1; | |
if (this.callbacks.length > 0) { | |
const cb = this.callbacks.shift(); | |
cb?.(); | |
} | |
} | |
} | |
} | |
} | |
const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms)); | |
const range = <T,>(n: number, fn: (i: number) => T): T[] => Array.from(new Array(n), (_, i) => fn(i)) | |
const main = async () => { | |
const n = 10; | |
const m = 30; | |
const semaphore = new Semaphore(n); | |
const task = async (i: number) => { | |
using lock = await semaphore.acquire(); | |
console.log(`Processing: ${i}`); | |
await sleep(1000); | |
return i; | |
} | |
const jobs = await Promise.all(range(m, task)); | |
console.log(jobs) | |
} | |
main() |
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{ | |
"compilerOptions": { | |
"target": "es2022", | |
"lib": ["es2022", "ESNext.Disposable"], | |
"module": "commonjs", | |
"outDir": "./dist", | |
"esModuleInterop": true, | |
"forceConsistentCasingInFileNames": true, | |
"strict": true, | |
"skipLibCheck": true | |
}, | |
"include": ["semaphore.ts"] | |
} |
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# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY. | |
# yarn lockfile v1 | |
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version "0.8.1" | |
resolved "https://registry.yarnpkg.com/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz#00629c35a688e05a88b1cda684fb9d5e73f000a1" | |
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dependencies: | |
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"@jridgewell/resolve-uri@^3.0.3": | |
version "3.1.2" | |
resolved "https://registry.yarnpkg.com/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz#7a0ee601f60f99a20c7c7c5ff0c80388c1189bd6" | |
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version "1.4.15" | |
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version "0.3.9" | |
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dependencies: | |
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version "20.12.7" | |
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undici-types "~5.26.4" | |
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acorn@^8.4.1: | |
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arg@^4.1.0: | |
version "4.1.3" | |
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"@cspotcode/source-map-support" "^0.8.0" | |
"@tsconfig/node10" "^1.0.7" | |
"@tsconfig/node12" "^1.0.7" | |
"@tsconfig/node14" "^1.0.0" | |
"@tsconfig/node16" "^1.0.2" | |
acorn "^8.4.1" | |
acorn-walk "^8.1.1" | |
arg "^4.1.0" | |
create-require "^1.1.0" | |
diff "^4.0.1" | |
make-error "^1.1.1" | |
v8-compile-cache-lib "^3.0.1" | |
yn "3.1.1" | |
typescript@^5.4.5: | |
version "5.4.5" | |
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undici-types@~5.26.4: | |
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