This question is usually asked by people who try closebecause they have seen that that is what they are supposed to do, and then run netstat and see that their socket is still active. Yes, close is the correct method.
Read two bytes to determine the message size and then loop until size bytes have been read. This works but I think this makes the non-blocking useless as we are effectively blocking the server.
Well, it blocks you long enough to read a single complete message, yes But, in general hopefully entire messages will be arriving intact at once, without much need to wait around very long You probably want to place a timeout on how long you wait trying to read the whole message, and if it doesn't arrive in that time, just give up on the connection and close it But, what you DON'T want to do is what you're doing in the code there: You need to wait until it becomes readable again before trying the recv again I don't know anything about libevent, so I can't tell you how to do it with that, but personally, I'd just hand that one FD to select or poll Also, not as portable This is very complicated to implement so I skip the details.
There would be a need to keep track of partial read buffers etc in some sort of structure. Good for non blocking operation but difficult to implement.
But, yeah, also the most work For every client, you'll need to keep track of any partially read messages in some buffer, and how much remains to be read Doable, if you really need to This method only works with level-triggered events but makes handling the non-blocking more easy.
That will likely kill your performance even worse than just blocking until you read the whole message Ignore events completely and send messages in a loop when needed. This of course make non-blocking unnecessary?
Non-blocking is useful for letting you easily add your own timeout, controlling how long you want to wait for a write to complete The same as stated above for reading You'd only block on write if you've completely filled up your send buffer, which means either the connection is screwed up so your system has been unable to deliver past messages by now, or you're writing faster than the client can read them Turn on the write event only when we have data to send and turn it off when we have no more data to send.
This is more complicated abut I believe this is the correct way of doing this: If you truly wanted to do something akin to this, you'd want ioctl SIOCOUTQwhich tells you how much unsent data is currently sitting in your send queue You'll just keep re-triggering the writability event over and over repeatedly, burning CPU time for nothing Also is it correct to close the file descriptor if I get a read of zero bytes?
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Server program which wait for the client to connect and reads the data */ /* using non-blocking socket. */ /* The reading of non-blocking sockets is done in a loop. Blocking vs. Non-Blocking Sockets One of the first issues that you’ll encounter when developing your Windows Sockets applications is the difference between blocking and non-blocking sockets.
Whenever you perform some operation on a socket, it may not be able to complete immediately and return control back to your program.
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