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基于swoole协程客户端不发生协程切换的问题

### 问题描述

### Swoole版本，PHP版本，以及操作系统版本信息
php版本：
(base) [root@localhost php]# php -v
PHP 7.4.15 (cli) (built: Feb  9 2021 17:51:20) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
swoole 版本:
(base) [root@localhost php]# php --ri swoole

swoole

Swoole => enabled
Author => Swoole Team <team@swoole.com>
Version => 4.6.4-dev
Built => Feb  9 2021 18:22:54
coroutine => enabled with boost asm context
epoll => enabled
eventfd => enabled
signalfd => enabled
cpu_affinity => enabled
spinlock => enabled
rwlock => enabled
openssl => OpenSSL 1.0.2k-fips  26 Jan 2017
http2 => enabled
json => enabled
curl-native => enabled
pcre => enabled
zlib => 1.2.7
mutex_timedlock => enabled
pthread_barrier => enabled
futex => enabled
async_redis => enabled

Directive => Local Value => Master Value
swoole.enable_coroutine => On => On
swoole.enable_library => On => On
swoole.enable_preemptive_scheduler => Off => Off
swoole.display_errors => On => On
swoole.use_shortname => On => On
swoole.unixsock_buffer_size => 8388608 => 8388608

linux 版本：
(base) [root@localhost php]# cat /proc/version
Linux version 3.10.0-514.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) ) #1 SMP Tue Nov 22 16:42:41 UTC 2016

### 相关代码
```php
# server端 192.168.1.6/swoole/index.php的代码
$t = "Guest";
if (isset($_GET['t'])) {
    sleep(3);
    $t = $_GET['t'];
}

$html = <<<data
 this is my server, user is :$t;
data;
exit($html);

# 协程http客户端代码
$cid1 = go(function(){
    $client = new httpClient('192.168.1.6', 80);
    $client->get('/swoole/index.php?t=justin');
    echo $client->body.PHP_EOL;
    $client->close();
});

$cid2 = go(function(){
    $client = new httpClient('192.168.1.6', 80);
    $client->get('/swoole/index.php');
    echo $client->body.PHP_EOL;
    $client->close();
});

var_dump($cid1,$cid2);
```

### 你期待的结果是什么？实际看到的错误信息又是什么？
期望结果:
先打印 78 行var_dump($cid1,$cid2);
在打印 73 行$cid2 中的 echo $client->body.PHP_EOL;
再打印 67 行$cid1 Z中 echo $client->body.PHP_EOL;

实际
     1，78行 var_dump($cid1,$cid2); 
     2，67行 $cid1 Z中 echo $client->body.PHP_EOL;
	 3. 73行 $cid2 中的 echo $client->body.PHP_EOL;
存在入参t=justin的时候，发送http请求，会在服务端sleep(3),应该发生协程调度 走 cid2 的 http请求啊。 为什么没有切换呢

发布于3年前 · 5 次浏览 · 来自提问