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Merge pull request #1629 from hintjens/master

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Problem: Windows 7 TCP slow start
This commit is contained in:
Constantin Rack 2015-11-01 13:16:55 +01:00
commit 22179afaba
1 changed files with 21 additions and 0 deletions
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21
src/signaler.cpp
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@ -511,6 +511,27 @@ int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
if (rc != SOCKET_ERROR)
*r_ = accept (listener, NULL, NULL);
// Send/receive large chunk to work around TCP slow start
// This code is a workaround for #1608
if (*r_ != INVALID_SOCKET) {
size_t dummy_size = 1024 * 1024; // 1M to overload default receive buffer
unsigned char *dummy = (unsigned char *) malloc (dummy_size);
int still_to_send = (int) dummy_size;
int still_to_recv = (int) dummy_size;
while (still_to_send || still_to_recv) {
int nbytes;
if (still_to_send > 0) {
nbytes = ::send (*w_, (char *) (dummy + dummy_size - still_to_send), still_to_send, 0);
wsa_assert (nbytes != SOCKET_ERROR);
still_to_send -= nbytes;
}
nbytes = ::recv (*r_, (char *) (dummy + dummy_size - still_to_recv), still_to_recv, 0);
wsa_assert (nbytes != SOCKET_ERROR);
still_to_recv -= nbytes;
}
free (dummy);
}
// Save errno if error occurred in bind/listen/connect/accept.
int saved_errno = 0;
if (*r_ == INVALID_SOCKET)