Sha256: 0ea0c865db18f8c90e518037d5456c4dee325f254754aee57d9af0d82fac40c8
Contents?: true
Size: 1007 Bytes
Versions: 27
Compression:
Stored size: 1007 Bytes
Contents
/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"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) {
this.available--;
callback();
} else {
this.waiters.push(callback);
}
}
release() {
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();
}
}
}
}
module.exports = Semaphore;
Version data entries
27 entries across 26 versions & 9 rubygems