Initial commit

src/Asynchronous.php

@@ -0,0 +1,127 @@
+<?php
+
+
+/**
+ * Class Asynchronous
+ */
+class Asynchronous
+{
+
+	private static $instance;
+
+	/** @var bool */
+	private $isChild = false;
+
+	private static $key = 0;
+
+	/** @var int[] */
+	private $children = [];
+
+	/** @var resource */
+	private $shm;
+
+	/** @var int */
+	private $shmKey;
+
+	/** @var string */
+	private $tempFile;
+
+	/**
+	 * Asynchronous constructor.
+	 */
+	private function __construct()
+	{
+		$this->tempFile = tempnam(__DIR__ . '/../temp', 'PHP');
+		$this->shmKey = ftok($this->tempFile, 'a');
+		Promise::_setShmKey($this->shmKey);
+		$this->attach();
+	}
+
+	/**
+	 * @return $this
+	 */
+	private function attach()
+	{
+		$this->shm = shm_attach($this->shmKey);
+
+		return $this;
+	}
+
+	/**
+	 * @return Asynchronous
+	 */
+	private static function getInstance()
+	{
+		if (is_null(self::$instance))
+			self::$instance = new static();
+
+		return self::$instance;
+	}
+
+
+	/**
+	 * @param callable $function
+	 * @param mixed ...$parameters
+	 * @return Promise|null;
+	 */
+	public static function run(callable $function, ...$parameters)
+	{
+		$instance = self::getInstance();
+		$pid = pcntl_fork();
+
+		if ($pid === false)
+			return null;
+
+		$key = self::generatePromiseKey();
+
+		if ($pid > 0) {
+			$instance->children[] = $pid;
+
+			return new Promise($key);
+		}
+
+		$instance->isChild = true;
+		$instance->attach();
+		try {
+			$response = call_user_func($function, ...$parameters);
+			shm_put_var($instance->shm, $key, $response ?? Promise::RESPONSE_NONE);
+			exit(0);
+		} catch (Throwable $throwable) {
+			exit(1);
+		}
+
+
+	}
+
+	/**
+	 * @return int
+	 */
+	private static function generatePromiseKey()
+	{
+		$promiseKey = self::$key;
+		self::$key++;
+		if (self::$key > 9999999)
+			self::$key = 0;
+
+		return $promiseKey;
+	}
+
+
+	/**
+	 *
+	 */
+	public function __destruct()
+	{
+		if ($this->isChild)
+			return;
+
+		while (count($this->children) > 0) {
+			pcntl_wait($status);
+			array_shift($this->children);
+		}
+		shm_remove($this->shm);
+		shm_detach($this->shm);
+		unlink($this->tempFile);
+	}
+
+}