https://infosec.exchange/packs/async-mutex-DHaCcEsI.js

1var e=Error(`request for lock canceled`),t=function(e,t,n,r){function i(e){return e instanceof n?e:new n(function(t){t(e)})}return new(n||=Promise)(function(n,a){function o(e){try{c(r.next(e))}catch(e){a(e)}}function s(e){try{c(r.throw(e))}catch(e){a(e)}}function c(e){e.done?n(e.value):i(e.value).then(o,s)}c((r=r.apply(e,t||[])).next())})},n=class{constructor(t,n=e){this._value=t,this._cancelError=n,this._queue=[],this._weightedWaiters=[]}acquire(e=1,t=0){if(e<=0)throw Error(`invalid weight ${e}: must be positive`);return new Promise((n,r)=>{let a={resolve:n,reject:r,weight:e,priority:t},o=i(this._queue,e=>t<=e.priority);o===-1&&e<=this._value?this._dispatchItem(a):this._queue.splice(o+1,0,a)})}runExclusive(e){return t(this,arguments,void 0,function*(e,t=1,n=0){let[r,i]=yield this.acquire(t,n);try{return yield e(r)}finally{i()}})}waitForUnlock(e=1,t=0){if(e<=0)throw Error(`invalid weight ${e}: must be positive`);return this._couldLockImmediately(e,t)?Promise.resolve():new Promise(n=>{this._weightedWaiters[e-1]||(this._weightedWaiters[e-1]=[]),r(this._weightedWaiters[e-1],{resolve:n,priority:t})})}isLocked(){return this._value<=0}getValue(){return this._value}setValue(e){this._value=e,this._dispatchQueue()}release(e=1){if(e<=0)throw Error(`invalid weight ${e}: must be positive`);this._value+=e,this._dispatchQueue()}cancel(){this._queue.forEach(e=>e.reject(this._cancelError)),this._queue=[]}_dispatchQueue(){for(this._drainUnlockWaiters();this._queue.length>0&&this._queue[0].weight<=this._value;)this._dispatchItem(this._queue.shift()),this._drainUnlockWaiters()}_dispatchItem(e){let t=this._value;this._value-=e.weight,e.resolve([t,this._newReleaser(e.weight)])}_newReleaser(e){let t=!1;return()=>{t||(t=!0,this.release(e))}}_drainUnlockWaiters(){if(this._queue.length===0)for(let e=this._value;e>0;e--){let t=this._weightedWaiters[e-1];t&&(t.forEach(e=>e.resolve()),this._weightedWaiters[e-1]=[])}else{let e=this._queue[0].priority;for(let t=this._value;t>0;t--){let n=this._weightedWaiters[t-1];if(!n)continue;let r=n.findIndex(t=>t.priority<=e);(r===-1?n:n.splice(0,r)).forEach((e=>e.resolve()))}}}_couldLockImmediately(e,t){return(this._queue.length===0||this._queue[0].priority<t)&&e<=this._value}};function r(e,t){let n=i(e,e=>t.priority<=e.priority);e.splice(n+1,0,t)}function i(e,t){for(let n=e.length-1;n>=0;n--)if(t(e[n]))return n;return-1}export{n as t};
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