1 files changed, 68 insertions, 0 deletions
diff --git a/node_modules/@calebboyd/semaphore/semaphore.js b/node_modules/@calebboyd/semaphore/semaphore.js
new file mode 100644
index 0000000..959db81
--- /dev/null
+++ b/node_modules/@calebboyd/semaphore/semaphore.js
@@ -0,0 +1,68 @@
+"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;