generic-library/libzmq
1
0
Fork 0
mirror of https://github.com/zeromq/libzmq.git synced 2025-03-04 07:27:26 +01:00
Code Issues Projects Releases Wiki Activity

Problem: SIO_LOOPBACK_FAST_PATH not activated for signaler socket pair

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
src/signaler.cpp
View File

@ -384,6 +384,33 @@ void zmq::signaler_t::forked ()
}
#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
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,
(char *) &so_reuseaddr, sizeof so_reuseaddr);
wsa_assert (rc != SOCKET_ERROR);
BOOL tcp_nodelay = 1;
rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, (char *) &tcp_nodelay,
sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
tune_socket (listener);
// Init sockaddr to signaler port.
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);
// Set TCP_NODELAY on writer socket.
rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY, (char *) &tcp_nodelay,
sizeof tcp_nodelay);
wsa_assert (rc != SOCKET_ERROR);
tune_socket (*w_);
if (sync != NULL) {
// Enter the critical section.