One disconnected instance effect to another instance at multi thread. about cpp_redis HOT 1 OPEN

#include <unistd.h>
#include <cpp_redis/cpp_redis>

cpp_redis::client client1;
cpp_redis::client client2;

void redisChangeStateHanlder(const std::string& host, std::size_t port, cpp_redis::client::connect_state status)
{
    if(port==6379)
        std::cerr << "client1 ";
    if(port==6380)
        std::cerr << "client2 ";
    
    if (status == cpp_redis::client::connect_state::dropped) {
        std::cerr << "connection dropped from " << host << ":" << port << std::endl;
    }
} 

int main()
{
    cpp_redis::client::connect_callback_t f = redisChangeStateHanlder;
    client1.connect("localhost", 6379, f, 3000, -1, 3000);
    client2.connect("localhost", 6380, f, 3000, -1, 3000);

    while(true)
    {
        if(client1.is_connected())
        {
            client1.ping([](cpp_redis::reply& reply) {
                std::cerr << "ping1: " << reply << std::endl;
            });
            client1.commit();
        }
        if(client2.is_connected())
        {
            client2.ping([](cpp_redis::reply& reply) {
                std::cerr << "ping2: " << reply << std::endl;
            });
            client2.commit();
        }
        sleep(1);
    }

    return 0;
}