chushihua

2026-01-26 23:20:48 +08:00
commit 7b5aab0206
22521 changed files with 3300090 additions and 0 deletions
@@ -0,0 +1,32 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+class Semaphore {
+	constructor(available) {
+		this.available = available;
+		this.waiters = [];
+	}
+
+	acquire(callback) {
+		if(this.available > 0) {
+			this.available--;
+			callback();
+		} else {
+			this.waiters.push(callback);
+		}
+	}
+
+	release() {
+		if(this.waiters.length > 0) {
+			const callback = this.waiters.pop();
+			process.nextTick(callback);
+		} else {
+			this.available++;
+		}
+	}
+}
+
+module.exports = Semaphore;