PHP编程中尝试程序并发的几种方式总结
发布:smiling 来源: PHP粉丝网 添加日期:2019-11-14 14:59:37 浏览: 评论:0
本文大约总结了PHP编程中的五种并发方式:
1.curl_multi_init
文档中说的是 Allows the processing of multiple cURL handles asynchronously. 确实是异步。这里需要理解的是select这个方法,文档中是这么解释的Blocks until there is activity on any of the curl_multi connections.。了解一下常见的异步模型就应该能理解,select, epoll,都很有名.
- // build the individual requests as above, but do not execute them
- $ch_1 = curl_init('http://www.jb51.net/');
- $ch_2 = curl_init('http://www.jb51.net/');
- curl_setopt($ch_1, CURLOPT_RETURNTRANSFER, true);
- curl_setopt($ch_2, CURLOPT_RETURNTRANSFER, true);
- // build the multi-curl handle, adding both $ch
- $mh = curl_multi_init();
- curl_multi_add_handle($mh, $ch_1);
- curl_multi_add_handle($mh, $ch_2);
- // execute all queries simultaneously, and continue when all are complete
- $running = null;
- do {
- curl_multi_exec($mh, $running);
- $ch = curl_multi_select($mh);
- if($ch !== 0){
- $info = curl_multi_info_read($mh);
- if($info){
- var_dump($info);
- $response_1 = curl_multi_getcontent($info['handle']);
- echo "$response_1 \n";
- break;
- }
- }
- } while ($running > 0);
- //phpfensi.com
- //close the handles
- curl_multi_remove_handle($mh, $ch_1);
- curl_multi_remove_handle($mh, $ch_2);
- curl_multi_close($mh);
这里我设置的是,select得到结果,就退出循环,并且删除 curl resource, 从而达到取消http请求的目的。
2.swoole_client
swoole_client提供了异步模式,我竟然把这个忘了。这里的sleep方法需要swoole版本大于等于1.7.21, 我还没升到这个版本,所以直接exit也可以。
- $client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);
- //设置事件回调函数
- $client->on("connect", function($cli) {
- $req = "GET / HTTP/1.1\r\n
- Host: www.jb51.net\r\n
- Connection: keep-alive\r\n
- Cache-Control: no-cache\r\n
- Pragma: no-cache\r\n\r\n";
- for ($i=0; $i < 3; $i++) {
- $cli->send($req);
- }
- });
- $client->on("receive", function($cli, $data){
- echo "Received: ".$data."\n";
- exit(0);
- $cli->sleep(); // swoole >= 1.7.21
- });
- $client->on("error", function($cli){
- echo "Connect failed\n";
- });
- //phpfensi.com
- $client->on("close", function($cli){
- echo "Connection close\n";
- });
- //发起网络连接
- $client->connect('183.207.95.145', 80, 1);
3.process
哎,竟然差点忘了 swoole_process, 这里就不用 pcntl 模块了。但是写完发现,这其实也不算是中断请求,而是哪个先到读哪个,忽视后面的返回值。
- $workers = [];
- $worker_num = 3;//创建的进程数
- $finished = false;
- $lock = new swoole_lock(SWOOLE_MUTEX);
- for($i=0;$i<$worker_num ; $i++){
- $process = new swoole_process('process');
- //$process->useQueue();
- $pid = $process->start();
- $workers[$pid] = $process;
- }
- foreach($workers as $pid => $process){
- //子进程也会包含此事件
- swoole_event_add($process->pipe, function ($pipe) use($process, $lock, &$finished) {
- $lock->lock();
- if(!$finished){
- $finished = true;
- $data = $process->read();
- echo "RECV: " . $data.PHP_EOL;
- }
- $lock->unlock();
- });
- }
- function process(swoole_process $process){
- $response = 'http response';
- $process->write($response);
- echo $process->pid,"\t",$process->callback .PHP_EOL;
- }
- //phpfensi.com
- for($i = 0; $i < $worker_num; $i++) {
- $ret = swoole_process::wait();
- $pid = $ret['pid'];
- echo "Worker Exit, PID=".$pid.PHP_EOL;
- }
4.pthreads
编译pthreads模块时,提示php编译时必须打开ZTS, 所以貌似必须 thread safe 版本才能使用. wamp中多php正好是TS的,直接下了个dll, 文档中的说明复制到对应目录,就在win下测试了。 还没完全理解,查到文章说 php 的 pthreads 和 POSIX pthreads是完全不一样的。代码有些烂,还需要多看看文档,体会一下。
- class Foo extends Stackable {
- public $url;
- public $response = null;
- public function __construct(){
- $this->url = 'http://www.jb51.net';
- }
- public function run(){}
- }
- class Process extends Worker {
- private $text = "";
- public function __construct($text,$object){
- $this->text = $text;
- $this->object = $object;
- }
- public function run(){
- while (is_null($this->object->response)){
- print " Thread {$this->text} is running\n";
- $this->object->response = 'http response';
- sleep(1);
- }
- }
- }
- $foo = new Foo();
- $a = new Process("A",$foo);
- $a->start();
- $b = new Process("B",$foo);
- $b->start();
- echo $foo->response;
5.yield
以同步方式书写异步代码:
- class AsyncServer {
- protected $handler;
- protected $socket;
- protected $tasks = [];
- protected $timers = [];
- public function __construct(callable $handler) {
- $this->handler = $handler;
- $this->socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
- if(!$this->socket) {
- die(socket_strerror(socket_last_error())."\n");
- }
- if (!socket_set_nonblock($this->socket)) {
- die(socket_strerror(socket_last_error())."\n");
- }
- if(!socket_bind($this->socket, "0.0.0.0", 1234)) {
- die(socket_strerror(socket_last_error())."\n");
- }
- }
- public function Run() {
- while (true) {
- $now = microtime(true) * 1000;
- foreach ($this->timers as $time => $sockets) {
- if ($time > $now) break;
- foreach ($sockets as $one) {
- list($socket, $coroutine) = $this->tasks[$one];
- unset($this->tasks[$one]);
- socket_close($socket);
- $coroutine->throw(new Exception("Timeout"));
- }
- unset($this->timers[$time]);
- }
- $reads = array($this->socket);
- foreach ($this->tasks as list($socket)) {
- $reads[] = $socket;
- }
- $writes = NULL;
- $excepts= NULL;
- if (!socket_select($reads, $writes, $excepts, 0, 1000)) {
- continue;
- }
- foreach ($reads as $one) {
- $len = socket_recvfrom($one, $data, 65535, 0, $ip, $port);
- if (!$len) {
- //echo "socket_recvfrom fail.\n";
- continue;
- }
- if ($one == $this->socket) {
- //echo "[Run]request recvfrom succ. data=$data ip=$ip port=$port\n";
- $handler = $this->handler;
- $coroutine = $handler($one, $data, $len, $ip, $port);
- if (!$coroutine) {
- //echo "[Run]everything is done.\n";
- continue;
- }
- $task = $coroutine->current();
- //echo "[Run]AsyncTask recv. data=$task->data ip=$task->ip port=$task->port timeout=$task->timeout\n";
- $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
- if(!$socket) {
- //echo socket_strerror(socket_last_error())."\n";
- $coroutine->throw(new Exception(socket_strerror(socket_last_error()), socket_last_error()));
- continue;
- }
- if (!socket_set_nonblock($socket)) {
- //echo socket_strerror(socket_last_error())."\n";
- $coroutine->throw(new Exception(socket_strerror(socket_last_error()), socket_last_error()));
- continue;
- }
- socket_sendto($socket, $task->data, $task->len, 0, $task->ip, $task->port);
- $deadline = $now + $task->timeout;
- $this->tasks[$socket] = [$socket, $coroutine, $deadline];
- $this->timers[$deadline][$socket] = $socket;
- } else {
- //echo "[Run]response recvfrom succ. data=$data ip=$ip port=$port\n";
- list($socket, $coroutine, $deadline) = $this->tasks[$one];
- unset($this->tasks[$one]);
- unset($this->timers[$deadline][$one]);
- socket_close($socket);
- $coroutine->send(array($data, $len));
- }
- }
- }
- }
- }
- class AsyncTask {
- public $data;
- public $len;
- public $ip;
- public $port;
- public $timeout;
- public function __construct($data, $len, $ip, $port, $timeout) {
- $this->data = $data;
- $this->len = $len;
- $this->ip = $ip;
- $this->port = $port;
- $this->timeout = $timeout;
- }
- }
- function AsyncSendRecv($req_buf, $req_len, $ip, $port, $timeout) {
- return new AsyncTask($req_buf, $req_len, $ip, $port, $timeout);
- }
- //phpfensi.com
- function RequestHandler($socket, $req_buf, $req_len, $ip, $port) {
- //echo "[RequestHandler] before yield AsyncTask. REQ=$req_buf\n";
- try {
- list($rsp_buf, $rsp_len) = (yield AsyncSendRecv($req_buf, $req_len, "127.0.0.1", 2345, 3000));
- } catch (Exception $ex) {
- $rsp_buf = $ex->getMessage();
- $rsp_len = strlen($rsp_buf);
- //echo "[Exception]$rsp_buf\n";
- }
- //echo "[RequestHandler] after yield AsyncTask. RSP=$rsp_buf\n";
- socket_sendto($socket, $rsp_buf, $rsp_len, 0, $ip, $port);
- }
- $server = new AsyncServer(RequestHandler);
- $server->Run();
代码解读:
借助PHP内置array能力,实现简单的“超时管理”,以毫秒为精度作为时间分片;
封装AsyncSendRecv接口,调用形如yield AsyncSendRecv(),更加自然;
添加Exception作为错误处理机制,添加ret_code亦可,仅为展示之用。
Tags: PHP编程 PHP程序并发
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