QTcpSocket / QTcpServer内存管理/服务器崩溃 [英] QTcpSocket / QTcpServer memory management / server crash
问题描述
我设计和制作一个应该能够处理大约每秒100次点击的服务器。我从服务器获得的信息只是HTTP头。基于来自头的信息，它将查询数据库（不同的线程）以获得一些信息，并将最终信息发送回创建输出字符串的QTcpServer，并发回HTTP响应。我有一个大问题，我不能调试。我的代码看起来像这样：
I am designing and making a server that should be able to handle about 100+ hits per second. The information I am getting from the server is just the HTTP header. Based on the information from the header, it will query a database(different thread) for some information and send the final information back to the QTcpServer which create an output string, and send back a HTTP Response. I am having a big problem with this that I cannot debug. My code look similar to this:
TCPInterface::TCPInterface(QObject *parent): QTcpServer(parent)
{
//start listening for tcp traffic on port 80
listen(QHostAddress::Any, 80);
connect(this,SIGNAL(sendInfo(QTcpSocket*, QString *)), databaseThread, SLOT(recieveInfo(QTcpSocket*, QString*)));
connect(databaseThread, SIGNAL(sendToTCPSend(QTcpSocket *, QString *)), this, SLOT(TCPSend(QTcpSocket*, QString*)));
}
`
void TCPInterface::incomingConnection(int socket)
{
QTcpSocket *s = new QTcpSocket(this);
connect(s, SIGNAL(readyRead()), this, SLOT(readClient()));
//connect(s, SIGNAL(disconnected()), this, SLOT(discardClient()));
s->setSocketDescriptor(socket);
}
`
//void TCPInterface::discardClient()
//{
//QTcpSocket* socket = (QTcpSocket*)sender();
//socket->deleteLater();
//}
`
void TCPInterface::readClient()
{
QTcpSocket* socket = (QTcpSocket*)sender();
QString header;
while(socket->canReadLine())
{
header += socket->readLine();
}
emit sendInfo(socket, headerInfo);
}
`
void databaseThread::recieveInfo(QTcpSocket* socket, QString* headerInfo)
{
QString*outputInfo = getDatabaseInfo(headerInfo);
emit sendToTCPSend(socket, outputInfo);
}
`
void TCPInterface::TCPSend(QTcpSocket* socket, QString* outputInfo);
{
QString response = "HTTP/1.0 200 Ok\r\n";
response += "Content-Type: text/html; charset=\"utf-8\"\r\n";
response += "\r\n" + *outputInfo + "\n";
if(socket->isWritable() && socket->isOpen())
{
socket->write(response.toAscii());
}
//socket->disconnectFromHost();
socket->close();
delete headerInfo;
}
我有一个主要问题，我知道它是什么，找到解决方案。
I having one main problem which I have an idea what it is, but cannot find a solution to fix it.
我的问题是我的记忆不断增加，因为我得到更多的命中。我确信这是因为我的QTcpSockets永远不会被删除，因为我只是关闭它们的原因。但是，当我不使用close，并使用disconnectFromHost和disconnect / discardClient插槽/信号我的服务器将崩溃与交通繁忙（没有消息或任何东西，所以我不确定崩溃的确切原因）。以前有人遇到这个问题吗？任何想法。
My problem is my memory is constantly increasing as I get more hits. I am sure the cause of this is my QTcpSockets are never being deleted, since I am just closing them. However when I don't use close, and use disconnectFromHost and disconnected/discardClient slot/signal my server will crash with heavy traffic(no message or anything so I am not sure of the exact reason of the crash). Has anyone run into this problem before? Any ideas at all.
推荐答案
我有同样的问题！
close（）假设要作为对象的构造函数。 （QT manual QTcpSocket ::〜QTcpSocket（））
我建议做一个实验：关闭一个套接字，并尝试重新打开它。如果失败，意味着套接字对象被销毁，如果不是意味着对象应该是deletelater（）..
close() suppose to be as de-constructor of the object. (QT manual QTcpSocket::~QTcpSocket()) There for I suggest to do an experiment: close a socket, and try to re open it. If it fails, it means the socket Object was destroyed, if not means the object should be deletelater()..
在我的情况下，连接被客户端关闭，并且有disconnect（）SIGNAL被调用，它触发对应的方法到你的discardClient（）SLOT，其中我deletelater（）套接字。
当我压力测试它，它通常崩溃时，我用一个I5笔记本电脑双核600-800连接同时轰炸。它平均每5次崩溃。
In my case the connection is closed by the client, and there for disconnect() SIGNAL is invoked and it trigger the correspond method to your discardClient() SLOT, where I deletelater() the socket. When I stress test it, it usually crash when I bombard it with 600-800 connection simultaneously on an I5 laptop dual core. it crash every 5 times on average.
其他方面它不会。
。
Gil
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