Re-use curl connection

[piunu]

Hi, I need some help, please.

Please answer these questions before submitting your issue.

1. What did you do? If possible, provide a simple script for reproducing the error.

<?php

Swoole\Runtime::enableCoroutine(true, SWOOLE_HOOK_NATIVE_CURL);

Swoole\Coroutine\run(function () {
    checkReuse();
});


function checkReuse()
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, 'https://example.com');
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

    curl_exec($curl);
    curl_exec($curl);

    $connectionTime = curl_getinfo($curl, CURLINFO_PRETRANSFER_TIME);

    if ($connectionTime < 0.01) {
        echo 'Curl re-use connection: ' . $connectionTime . ' sec';
    } else {
        echo 'Curl create new connection: ' . $connectionTime . ' sec';
    }

    echo "\r\n";
}

2. What did you expect to see?

I expect curl to reuse the connection in the second request.

3. What did you see instead?

I see that curl creates a new connection for each request.
The problem is only with SWOOLE_HOOK_NATIVE_CURL. When using SWOOLE_HOOK_CURL or curl without swoole, there is no problem.
I checked on Ubuntu 20.04, 22.04 and Debian 11, and on older versions of swoole.

4. What version of Swoole are you using (show your php --ri swoole)?

swoole

Swoole => enabled
Author => Swoole Team <team@swoole.com>
Version => 5.1.0-dev
Built => Jun 22 2023 01:44:22
coroutine => enabled with boost asm context
epoll => enabled
eventfd => enabled
signalfd => enabled
cpu_affinity => enabled
spinlock => enabled
rwlock => enabled
sockets => enabled
openssl => OpenSSL 1.1.1n  15 Mar 2022
dtls => enabled
http2 => enabled
json => enabled
curl-native => enabled
zlib => 1.2.11
brotli => E16777225/D16777225
mutex_timedlock => enabled
pthread_barrier => enabled
futex => enabled
mysqlnd => enabled
async_redis => enabled
coroutine_pgsql => enabled

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

5. What is your machine environment used (show your uname -a & php -v & gcc -v) ?

Linux ip-172-31-22-1 5.10.0-23-cloud-amd64 #1 SMP Debian 5.10.179-1 (2023-05-12) x86_64 GNU/Linux

PHP 8.2.7 (cli) (built: Jun  9 2023 07:37:35) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.7, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.7, Copyright (c), by Zend Technologies`

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.1-6' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-Km9U7s/gcc-10-10.2.1/debian/tmp-gcn/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-mutex
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.1 20210110 (Debian 10.2.1-6) 

[NathanFreeman]

Can not share the same curl connection between coroutines.

[NathanFreeman]

Each request needs to create different connections and maintain IO state of different connections.