| 45 | } |
| 46 | |
| 47 | export async function read(key: string): Promise<Disposable> { |
| 48 | const lock = get(key) |
| 49 | |
| 50 | return new Promise((resolve) => { |
| 51 | if (!lock.writer && lock.waitingWriters.length === 0) { |
| 52 | lock.readers++ |
| 53 | resolve({ |
| 54 | [Symbol.dispose]: () => { |
| 55 | lock.readers-- |
| 56 | process(key) |
| 57 | }, |
| 58 | }) |
| 59 | } else { |
| 60 | lock.waitingReaders.push(() => { |
| 61 | lock.readers++ |
| 62 | resolve({ |
| 63 | [Symbol.dispose]: () => { |
| 64 | lock.readers-- |
| 65 | process(key) |
| 66 | }, |
| 67 | }) |
| 68 | }) |
| 69 | } |
| 70 | }) |
| 71 | } |
| 72 | |
| 73 | export async function write(key: string): Promise<Disposable> { |
| 74 | const lock = get(key) |