Accept() takes 2-3 seconds

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Hi,
I'm having a problem with accept function in Windows.
It takes 2-4 seconds to accept a socket from another 3rd party application.

Here is my code:

C++

DWORD dwStart = GetTickCount();
AcceptSocket = accept(ListenSocket, NULL, NULL);
DWORD dwEnd = GetTickCount();
DWORD time = dwEnd - dwStart;
printf("Accept took: %u",time);

Please help me with this issue :)

Thanks,
AR

Posted 1-Dec-10 3:00am

Alexeirob

Updated 1-Dec-10 3:01am

Henry Minute

v2

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LloydA111 1-Dec-10 11:01am

Perhaps it's simply because it blocks, and then waits for a connection which could take anything from a few milliseconds to several seconds depending on how fast/reliable the network is.

Alexeirob 2-Dec-10 2:37am

But how can it be? The connect is coming 0.5 seconds before the accept. And the connection is through the loopback. Can it be related to blocking/non-blocking socket?

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E.F. Nijboer · Accepted Answer · 2010-12-01T03:29:00

Have a look at the remarks on accept:

The accept function can block the caller until a connection is present if no pending connections are present on the queue, and the socket is marked as blocking. If the socket is marked as nonblocking and no pending connections are present on the queue, accept returns an error as described in the following. After the successful completion of accept returns a new socket handle, the accepted socket cannot be used to accept more connections. The original socket remains open and listens for new connection requests.

http://msdn.microsoft.com/en-us/library/ms737526%28VS.85%29.aspx[^]

You might want to improve response time by using a thread to prevent blocking. You could notify the main thread using an event but be sure to invoke this properly to avoid problems in that area.

http://members.cox.net/doug_web/threads.htm[^]

Good luck!