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"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
Object.defineProperty(exports, "__esModule", { value: true });
var bound_1 = require("./bound");
var deferred_1 = require("./deferred");
function createLock(count, promise) {
if (promise === void 0) { promise = Promise; }
return new Semaphore(count, promise);
}
exports.createLock = createLock;
var Semaphore = /** @class */ (function () {
function Semaphore(size, promise) {
if (size === void 0) { size = 1; }
if (promise === void 0) { promise = Promise; }
this.size = size;
this.promise = promise;
this.waiting = [];
this.locks = 0;
this.requestedLockCount = 0;
this.createDeferred = this.promise !== Promise
? deferred_1.createDeferredFactory(this.promise)
: deferred_1.createDeferred;
if (!size || size < 1) {
throw new Error('Cannot create Semaphore with size of "' + size + '"');
}
}
Object.defineProperty(Semaphore.prototype, "count", {
get: function () { return this.locks; },
enumerable: true,
configurable: true
});
Object.defineProperty(Semaphore.prototype, "pending", {
get: function () { return this.waiting.length; },
enumerable: true,
configurable: true
});
Semaphore.prototype.acquire = function (arg) {
++this.requestedLockCount;
arg = (typeof arg !== 'undefined' ? arg : this.requestedLockCount);
if (this.locks < this.size) {
this.locks++;
return this.promise.resolve(arg);
}
var lock = this.createDeferred();
lock.value = arg;
this.waiting.push(lock);
return lock.promise;
};
Semaphore.prototype.release = function () {
var lock = this.waiting.shift();
if (lock) {
lock.resolve(lock.value);
}
else if (--this.locks < 0) {
throw new Error('Nothing to release...');
}
};
__decorate([
bound_1.bound
], Semaphore.prototype, "release", null);
return Semaphore;
}());
exports.Semaphore = Semaphore;
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