本文整理汇总了C++中ConnectionDescriptor::SelectForWrite方法的典型用法代码示例。如果您正苦于以下问题：C++ ConnectionDescriptor::SelectForWrite方法的具体用法？C++ ConnectionDescriptor::SelectForWrite怎么用？C++ ConnectionDescriptor::SelectForWrite使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ConnectionDescriptor的用法示例。
在下文中一共展示了ConnectionDescriptor::SelectForWrite方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Read
void AcceptorDescriptor::Read()
{
/* Accept up to a certain number of sockets on the listening connection.
* Don't try to accept all that are present, because this would allow a DoS attack
* in which no data were ever read or written. We should accept more than one,
* if available, to keep the partially accepted sockets from backing up in the kernel.
*/
/* Make sure we use non-blocking i/o on the acceptor socket, since we're selecting it
* for readability. According to Stevens UNP, it's possible for an acceptor to select readable
* and then block when we call accept. For example, the other end resets the connection after
* the socket selects readable and before we call accept. The kernel will remove the dead
* socket from the accept queue. If the accept queue is now empty, accept will block.
*/
struct sockaddr_in pin;
socklen_t addrlen = sizeof (pin);
for (int i=0; i < 10; i++) {
int sd = accept (GetSocket(), (struct sockaddr*)&pin, &addrlen);
if (sd == INVALID_SOCKET) {
// This breaks the loop when we've accepted everything on the kernel queue,
// up to 10 new connections. But what if the *first* accept fails?
// Does that mean anything serious is happening, beyond the situation
// described in the note above?
break;
}
// Set the newly-accepted socket non-blocking.
// On Windows, this may fail because, weirdly, Windows inherits the non-blocking
// attribute that we applied to the acceptor socket into the accepted one.
if (!SetSocketNonblocking (sd)) {
//int val = fcntl (sd, F_GETFL, 0);
//if (fcntl (sd, F_SETFL, val | O_NONBLOCK) == -1) {
shutdown (sd, 1);
closesocket (sd);
continue;
}
// Disable slow-start (Nagle algorithm). Eventually make this configurable.
int one = 1;
setsockopt (sd, IPPROTO_TCP, TCP_NODELAY, (char*) &one, sizeof(one));
ConnectionDescriptor *cd = new ConnectionDescriptor (sd, MyEventMachine);
if (!cd)
throw std::runtime_error ("no newly accepted connection");
cd->SetServerMode();
if (EventCallback) {
(*EventCallback) (GetBinding().c_str(), EM_CONNECTION_ACCEPTED, cd->GetBinding().c_str(), cd->GetBinding().size());
}
#ifdef HAVE_EPOLL
cd->GetEpollEvent()->events = EPOLLIN | (cd->SelectForWrite() ? EPOLLOUT : 0);
#endif
assert (MyEventMachine);
MyEventMachine->Add (cd);
#ifdef HAVE_KQUEUE
if (cd->SelectForWrite())
MyEventMachine->ArmKqueueWriter (cd);
MyEventMachine->ArmKqueueReader (cd);
#endif
}
}