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Last change
on this file since ba17441 was a762898, checked in by istevanoska <ilinastevanoska@…>, 5 months ago |
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Added visualizations
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100644
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File size:
678 bytes
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| [a762898] | 1 | class Semaphore {
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| 2 | capacity;
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| 3 | available;
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| 4 | deferredTasks = [];
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| 5 | constructor(capacity) {
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| 6 | this.capacity = capacity;
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| 7 | this.available = capacity;
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| 8 | }
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| 9 | async acquire() {
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| 10 | if (this.available > 0) {
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| 11 | this.available--;
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| 12 | return;
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| 13 | }
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| 14 | return new Promise(resolve => {
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| 15 | this.deferredTasks.push(resolve);
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| 16 | });
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| 17 | }
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| 18 | release() {
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| 19 | const deferredTask = this.deferredTasks.shift();
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| 20 | if (deferredTask != null) {
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| 21 | deferredTask();
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| 22 | return;
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| 23 | }
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| 24 | if (this.available < this.capacity) {
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| 25 | this.available++;
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| 26 | }
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| 27 | }
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| 28 | }
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| 29 |
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| 30 | export { Semaphore };
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