Re: thread stuck in send()

I have a multi-threaded client app where each client thread does
something like this:

TestThread()
{
 SOCKET sd= socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 /*...*/
 while (running)
 {
   DWORD dwStartTime = GetTickCount();
   send(sd, pBuf, BufSize, 0);
   DWORD dwTotalTime = GetTickCount() - dwStartTime;

   TRACE(_T("Socket %d took %dms\n"), sd, dwTotalTime);
   //... calculate throughput and record results ...
 }
 /*...*/
}

The trouble is that when I watch the throughput for each test, I'll see
that socket 1 will be running for a long time, and then socket 2 will
take over for a while, and then back to socket 1. The beginning of each
time a new socket takes over will be marked with a really long time
(like 13+ seconds for a chunk of data that should take around 100ms).