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node_modules/webpack/lib/util/Semaphore.js

@@ -5,13 +5,26 @@
 "use strict";
 
 class Semaphore {
+	/**
+	 * Creates an instance of Semaphore.
+	 *
+	 * @param {number} available the amount available number of "tasks"
+	 * in the Semaphore
+	 */
 	constructor(available) {
 		this.available = available;
+		/** @type {(function(): void)[]} */
 		this.waiters = [];
+		/** @private */
+		this._continue = this._continue.bind(this);
 	}
 
+	/**
+	 * @param {function(): void} callback function block to capture and run
+	 * @returns {void}
+	 */
 	acquire(callback) {
-		if(this.available > 0) {
+		if (this.available > 0) {
 			this.available--;
 			callback();
 		} else {
@@ -20,11 +33,19 @@ class Semaphore {
 	}
 
 	release() {
-		if(this.waiters.length > 0) {
-			const callback = this.waiters.pop();
-			process.nextTick(callback);
-		} else {
-			this.available++;
+		this.available++;
+		if (this.waiters.length > 0) {
+			process.nextTick(this._continue);
+		}
+	}
+
+	_continue() {
+		if (this.available > 0) {
+			if (this.waiters.length > 0) {
+				this.available--;
+				const callback = this.waiters.pop();
+				callback();
+			}
 		}
 	}
 }