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Problem: SIO_LOOPBACK_FAST_PATH not activated for signaler socket pair

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Solution: activate SIO_LOOPBACK_FAST_PATH if available

See #2899
This commit is contained in:
sigiesec
2018-02-05 12:20:52 +01:00
committed by Simon Giesecke
parent 9544dade49
commit 490d76da2f
1 changed files with 30 additions and 7 deletions
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37
src/signaler.cpp
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@@ -384,6 +384,33 @@ void zmq::signaler_t::forked ()
} }
#endif #endif
#if defined ZMQ_HAVE_WINDOWS
static void tune_socket (const SOCKET socket)
{
BOOL tcp_nodelay = 1;
int rc = setsockopt (socket, IPPROTO_TCP, TCP_NODELAY,
(char *) &tcp_nodelay, sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
int sio_loopback_fastpath = 1;
DWORD numberOfBytesReturned = 0;
rc = WSAIoctl (socket, SIO_LOOPBACK_FAST_PATH, &sio_loopback_fastpath,
sizeof sio_loopback_fastpath, NULL, 0,
&numberOfBytesReturned, 0, 0);
if (SOCKET_ERROR == rc) {
DWORD lastError = ::WSAGetLastError ();
if (WSAEOPNOTSUPP == lastError) {
// This system is not Windows 8 or Server 2012, and the call is not supported.
} else {
wsa_assert (false);
}
}
}
#endif
// Returns -1 if we could not make the socket pair successfully // Returns -1 if we could not make the socket pair successfully
int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_) int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
{ {
@@ -483,10 +510,8 @@ int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
int rc = setsockopt (listener, SOL_SOCKET, SO_REUSEADDR, int rc = setsockopt (listener, SOL_SOCKET, SO_REUSEADDR,
(char *) &so_reuseaddr, sizeof so_reuseaddr); (char *) &so_reuseaddr, sizeof so_reuseaddr);
wsa_assert (rc != SOCKET_ERROR); wsa_assert (rc != SOCKET_ERROR);
BOOL tcp_nodelay = 1;
rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, (char *) &tcp_nodelay, tune_socket (listener);
sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
// Init sockaddr to signaler port. // Init sockaddr to signaler port.
struct sockaddr_in addr; struct sockaddr_in addr;
@@ -500,9 +525,7 @@ int zmq::signaler_t::make_fdpair (fd_t *r_, fd_t *w_)
wsa_assert (*w_ != INVALID_SOCKET); wsa_assert (*w_ != INVALID_SOCKET);
// Set TCP_NODELAY on writer socket. // Set TCP_NODELAY on writer socket.
rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY, (char *) &tcp_nodelay, tune_socket (*w_);
sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
if (sync != NULL) { if (sync != NULL) {
// Enter the critical section. // Enter the critical section.