ciorent/semaphore.js

A lightweight, low-overhead concurrency library

export let init=e=>{let n=[null];let r=[n,n,e=>{r[0]=r[0][0]=[null,e]},e];return r};export let acquire=async e=>{e[3]--;if(e[3]<0)return new Promise(e[2])};export let release=e=>{if(e[3]<0)(e[1]=e[1][0])[1]();e[3]++};export let bind=(e,n)=>async(...r)=>{n[3]--;if(n[3]<0)await new Promise(n[2]);try{return await e(...r)}finally{if(n[3]<0)(n[1]=n[1][0])[1]();n[3]++}};