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Commit 709a1e9a authored by Constantin Rack's avatar Constantin Rack
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Merge pull request #1535 from somdoron/master 

problem: trying to support polling on thread safe sockets with zmq_poll failed
parents a96f16e3 4da5ff6a
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Showing with 473 additions and 43 deletions
include/zmq.h
View file @ 709a1e9a
...@@ -410,8 +410,16 @@ typedef struct zmq_pollitem_t ...@@ -410,8 +410,16 @@ typedef struct zmq_pollitem_t
#define ZMQ_POLLITEMS_DFLT 16 #define ZMQ_POLLITEMS_DFLT 16
ZMQ_EXPORT int zmq_poll (zmq_pollitem_t *items, int nitems, long timeout); ZMQ_EXPORT int zmq_poll (zmq_pollitem_t *items, int nitems, long timeout);
/******************************************************************************/
/* Pollfd polling on thread safe socket */
/******************************************************************************/
ZMQ_EXPORT void *zmq_pollfd_new (); ZMQ_EXPORT void *zmq_pollfd_new ();
ZMQ_EXPORT int zmq_pollfd_close (void *p); ZMQ_EXPORT int zmq_pollfd_close (void *p);
ZMQ_EXPORT void zmq_pollfd_recv (void *p);
ZMQ_EXPORT int zmq_pollfd_wait (void *p, int timeout_);
ZMQ_EXPORT int zmq_pollfd_poll (void *p, zmq_pollitem_t *items, int nitems, long timeout);
#if defined _WIN32 #if defined _WIN32
ZMQ_EXPORT SOCKET zmq_pollfd_fd (void *p); ZMQ_EXPORT SOCKET zmq_pollfd_fd (void *p);
......
src/zmq.cpp
View file @ 709a1e9a
...@@ -709,6 +709,364 @@ const char *zmq_msg_gets (zmq_msg_t *msg_, const char *property_) ...@@ -709,6 +709,364 @@ const char *zmq_msg_gets (zmq_msg_t *msg_, const char *property_)
} }
} }
// Polling.
int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
{
// TODO: the function implementation can just call zmq_pollfd_poll with pollfd as NULL, however pollfd is not yet stable
#if defined ZMQ_POLL_BASED_ON_POLL
if (unlikely (nitems_ < 0)) {
errno = EINVAL;
return -1;
}
if (unlikely (nitems_ == 0)) {
if (timeout_ == 0)
return 0;
#if defined ZMQ_HAVE_WINDOWS
Sleep (timeout_ > 0 ? timeout_ : INFINITE);
return 0;
#elif defined ZMQ_HAVE_ANDROID
usleep (timeout_ * 1000);
return 0;
#else
return usleep (timeout_ * 1000);
#endif
}
if (!items_) {
errno = EFAULT;
return -1;
}
zmq::clock_t clock;
uint64_t now = 0;
uint64_t end = 0;
pollfd spollfds[ZMQ_POLLITEMS_DFLT];
pollfd *pollfds = spollfds;
if (nitems_ > ZMQ_POLLITEMS_DFLT) {
pollfds = (pollfd*) malloc (nitems_ * sizeof (pollfd));
alloc_assert (pollfds);
}
// Build pollset for poll () system call.
for (int i = 0; i != nitems_; i++) {
// If the poll item is a 0MQ socket, we poll on the file descriptor
// retrieved by the ZMQ_FD socket option.
if (items_ [i].socket) {
size_t zmq_fd_size = sizeof (zmq::fd_t);
if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &pollfds [i].fd,
&zmq_fd_size) == -1) {
if (pollfds != spollfds)
free (pollfds);
return -1;
}
pollfds [i].events = items_ [i].events ? POLLIN : 0;
}
// Else, the poll item is a raw file descriptor. Just convert the
// events to normal POLLIN/POLLOUT for poll ().
else {
pollfds [i].fd = items_ [i].fd;
pollfds [i].events =
(items_ [i].events & ZMQ_POLLIN ? POLLIN : 0) |
(items_ [i].events & ZMQ_POLLOUT ? POLLOUT : 0) |
(items_ [i].events & ZMQ_POLLPRI ? POLLPRI : 0);
}
}
bool first_pass = true;
int nevents = 0;
while (true) {
// Compute the timeout for the subsequent poll.
int timeout;
if (first_pass)
timeout = 0;
else
if (timeout_ < 0)
timeout = -1;
else
timeout = end - now;
// Wait for events.
while (true) {
int rc = poll (pollfds, nitems_, timeout);
if (rc == -1 && errno == EINTR) {
if (pollfds != spollfds)
free (pollfds);
return -1;
}
errno_assert (rc >= 0);
break;
}
// Check for the events.
for (int i = 0; i != nitems_; i++) {
items_ [i].revents = 0;
// The poll item is a 0MQ socket. Retrieve pending events
// using the ZMQ_EVENTS socket option.
if (items_ [i].socket) {
size_t zmq_events_size = sizeof (uint32_t);
uint32_t zmq_events;
if (zmq_getsockopt (items_ [i].socket, ZMQ_EVENTS, &zmq_events,
&zmq_events_size) == -1) {
if (pollfds != spollfds)
free (pollfds);
return -1;
}
if ((items_ [i].events & ZMQ_POLLOUT) &&
(zmq_events & ZMQ_POLLOUT))
items_ [i].revents |= ZMQ_POLLOUT;
if ((items_ [i].events & ZMQ_POLLIN) &&
(zmq_events & ZMQ_POLLIN))
items_ [i].revents |= ZMQ_POLLIN;
}
// Else, the poll item is a raw file descriptor, simply convert
// the events to zmq_pollitem_t-style format.
else {
if (pollfds [i].revents & POLLIN)
items_ [i].revents |= ZMQ_POLLIN;
if (pollfds [i].revents & POLLOUT)
items_ [i].revents |= ZMQ_POLLOUT;
if (pollfds [i].revents & POLLPRI)
items_ [i].revents |= ZMQ_POLLPRI;
if (pollfds [i].revents & ~(POLLIN | POLLOUT | POLLPRI))
items_ [i].revents |= ZMQ_POLLERR;
}
if (items_ [i].revents)
nevents++;
}
// If timout is zero, exit immediately whether there are events or not.
if (timeout_ == 0)
break;
// If there are events to return, we can exit immediately.
if (nevents)
break;
// At this point we are meant to wait for events but there are none.
// If timeout is infinite we can just loop until we get some events.
if (timeout_ < 0) {
if (first_pass)
first_pass = false;
continue;
}
// The timeout is finite and there are no events. In the first pass
// we get a timestamp of when the polling have begun. (We assume that
// first pass have taken negligible time). We also compute the time
// when the polling should time out.
if (first_pass) {
now = clock.now_ms ();
end = now + timeout_;
if (now == end)
break;
first_pass = false;
continue;
}
// Find out whether timeout have expired.
now = clock.now_ms ();
if (now >= end)
break;
}
if (pollfds != spollfds)
free (pollfds);
return nevents;
#elif defined ZMQ_POLL_BASED_ON_SELECT
if (unlikely (nitems_ < 0)) {
errno = EINVAL;
return -1;
}
if (unlikely (nitems_ == 0)) {
if (timeout_ == 0)
return 0;
#if defined ZMQ_HAVE_WINDOWS
Sleep (timeout_ > 0 ? timeout_ : INFINITE);
return 0;
#else
return usleep (timeout_ * 1000);
#endif
}
zmq::clock_t clock;
uint64_t now = 0;
uint64_t end = 0;
// Ensure we do not attempt to select () on more than FD_SETSIZE
// file descriptors.
zmq_assert (nitems_ <= FD_SETSIZE);
fd_set pollset_in;
FD_ZERO (&pollset_in);
fd_set pollset_out;
FD_ZERO (&pollset_out);
fd_set pollset_err;
FD_ZERO (&pollset_err);
zmq::fd_t maxfd = 0;
// Build the fd_sets for passing to select ().
for (int i = 0; i != nitems_; i++) {
// If the poll item is a 0MQ socket we are interested in input on the
// notification file descriptor retrieved by the ZMQ_FD socket option.
if (items_ [i].socket) {
size_t zmq_fd_size = sizeof (zmq::fd_t);
zmq::fd_t notify_fd;
if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &notify_fd,
&zmq_fd_size) == -1)
return -1;
if (items_ [i].events) {
FD_SET (notify_fd, &pollset_in);
if (maxfd < notify_fd)
maxfd = notify_fd;
}
}
// Else, the poll item is a raw file descriptor. Convert the poll item
// events to the appropriate fd_sets.
else {
if (items_ [i].events & ZMQ_POLLIN)
FD_SET (items_ [i].fd, &pollset_in);
if (items_ [i].events & ZMQ_POLLOUT)
FD_SET (items_ [i].fd, &pollset_out);
if (items_ [i].events & ZMQ_POLLERR)
FD_SET (items_ [i].fd, &pollset_err);
if (maxfd < items_ [i].fd)
maxfd = items_ [i].fd;
}
}
bool first_pass = true;
int nevents = 0;
fd_set inset, outset, errset;
while (true) {
// Compute the timeout for the subsequent poll.
timeval timeout;
timeval *ptimeout;
if (first_pass) {
timeout.tv_sec = 0;
timeout.tv_usec = 0;
ptimeout = &timeout;
}
else
if (timeout_ < 0)
ptimeout = NULL;
else {
timeout.tv_sec = (long) ((end - now) / 1000);
timeout.tv_usec = (long) ((end - now) % 1000 * 1000);
ptimeout = &timeout;
}
// Wait for events. Ignore interrupts if there's infinite timeout.
while (true) {
memcpy (&inset, &pollset_in, sizeof (fd_set));
memcpy (&outset, &pollset_out, sizeof (fd_set));
memcpy (&errset, &pollset_err, sizeof (fd_set));
#if defined ZMQ_HAVE_WINDOWS
int rc = select (0, &inset, &outset, &errset, ptimeout);
if (unlikely (rc == SOCKET_ERROR)) {
errno = zmq::wsa_error_to_errno (WSAGetLastError ());
wsa_assert (errno == ENOTSOCK);
return -1;
}
#else
int rc = select (maxfd + 1, &inset, &outset, &errset, ptimeout);
if (unlikely (rc == -1)) {
errno_assert (errno == EINTR || errno == EBADF);
return -1;
}
#endif
break;
}
// Check for the events.
for (int i = 0; i != nitems_; i++) {
items_ [i].revents = 0;
// The poll item is a 0MQ socket. Retrieve pending events
// using the ZMQ_EVENTS socket option.
if (items_ [i].socket) {
size_t zmq_events_size = sizeof (uint32_t);
uint32_t zmq_events;
if (zmq_getsockopt (items_ [i].socket, ZMQ_EVENTS, &zmq_events,
&zmq_events_size) == -1)
return -1;
if ((items_ [i].events & ZMQ_POLLOUT) &&
(zmq_events & ZMQ_POLLOUT))
items_ [i].revents |= ZMQ_POLLOUT;
if ((items_ [i].events & ZMQ_POLLIN) &&
(zmq_events & ZMQ_POLLIN))
items_ [i].revents |= ZMQ_POLLIN;
}
// Else, the poll item is a raw file descriptor, simply convert
// the events to zmq_pollitem_t-style format.
else {
if (FD_ISSET (items_ [i].fd, &inset))
items_ [i].revents |= ZMQ_POLLIN;
if (FD_ISSET (items_ [i].fd, &outset))
items_ [i].revents |= ZMQ_POLLOUT;
if (FD_ISSET (items_ [i].fd, &errset))
items_ [i].revents |= ZMQ_POLLERR;
}
if (items_ [i].revents)
nevents++;
}
// If timout is zero, exit immediately whether there are events or not.
if (timeout_ == 0)
break;
// If there are events to return, we can exit immediately.
if (nevents)
break;
// At this point we are meant to wait for events but there are none.
// If timeout is infinite we can just loop until we get some events.
if (timeout_ < 0) {
if (first_pass)
first_pass = false;
continue;
}
// The timeout is finite and there are no events. In the first pass
// we get a timestamp of when the polling have begun. (We assume that
// first pass have taken negligible time). We also compute the time
// when the polling should time out.
if (first_pass) {
now = clock.now_ms ();
end = now + timeout_;
if (now == end)
break;
first_pass = false;
continue;
}
// Find out whether timeout have expired.
now = clock.now_ms ();
if (now >= end)
break;
}
return nevents;
#else
// Exotic platforms that support neither poll() nor select().
errno = ENOTSUP;
return -1;
#endif
}
// Create pollfd // Create pollfd
void *zmq_pollfd_new () void *zmq_pollfd_new ()
...@@ -718,28 +1076,44 @@ void *zmq_pollfd_new () ...@@ -718,28 +1076,44 @@ void *zmq_pollfd_new ()
// Close pollfd // Close pollfd
int zmq_pollfd_close (void* p) int zmq_pollfd_close (void* p_)
{ {
zmq::signaler_t *s = (zmq::signaler_t*)p; zmq::signaler_t *s = (zmq::signaler_t*)p_;
LIBZMQ_DELETE(s); LIBZMQ_DELETE(s);
return 0; return 0;
} }
// Get poller fd // Recv signal from pollfd
void zmq_pollfd_recv(void *p_)
{
zmq::signaler_t *s = (zmq::signaler_t*)p_;
s->recv ();
}
// Wait until pollfd is signalled
int zmq_pollfd_wait(void *p_, int timeout_)
{
zmq::signaler_t *s = (zmq::signaler_t*)p_;
return s->wait (timeout_);
}
// Get pollfd fd
#if defined _WIN32 #if defined _WIN32
SOCKET zmq_pollfd_fd (void *p) SOCKET zmq_pollfd_fd (void *p_)
#else #else
int zmq_pollfd_fd (void *p) int zmq_pollfd_fd (void *p_)
#endif #endif
{ {
zmq::signaler_t *s = (zmq::signaler_t*)p; zmq::signaler_t *s = (zmq::signaler_t*)p_;
return s->get_fd (); return s->get_fd ();
} }
// Polling. // Polling thread safe sockets version
int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) int zmq_pollfd_poll (void* p_, zmq_pollitem_t *items_, int nitems_, long timeout_)
{ {
#if defined ZMQ_POLL_BASED_ON_POLL #if defined ZMQ_POLL_BASED_ON_POLL
if (unlikely (nitems_ < 0)) { if (unlikely (nitems_ < 0)) {
...@@ -770,12 +1144,48 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -770,12 +1144,48 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
uint64_t end = 0; uint64_t end = 0;
pollfd spollfds[ZMQ_POLLITEMS_DFLT]; pollfd spollfds[ZMQ_POLLITEMS_DFLT];
pollfd *pollfds = spollfds; pollfd *pollfds = spollfds;
int pollfds_size = 0;
int pollfds_index = 0;
bool use_pollfd = false;
if (nitems_ > ZMQ_POLLITEMS_DFLT) { for (int i = 0; i != nitems_; i++) {
pollfds = (pollfd*) malloc (nitems_ * sizeof (pollfd)); if (items_ [i].socket) {
int thread_safe;
size_t thread_safe_size = sizeof(int);
if (zmq_getsockopt (items_ [i].socket, ZMQ_THREAD_SAFE, &thread_safe,
&thread_safe_size) == -1) {
return -1;
}
// All thread safe sockets share same fd
if (thread_safe) {
// if poll fd is not set yet and events are set for this socket
if (!use_pollfd && items_ [i].events) {
use_pollfd = true;
pollfds_size++;
}
}
else
pollfds_size++;
}
else
pollfds_size++;
}
if (pollfds_size > ZMQ_POLLITEMS_DFLT) {
pollfds = (pollfd*) malloc (pollfds_size * sizeof (pollfd));
alloc_assert (pollfds); alloc_assert (pollfds);
} }
// If we have at least one thread safe socket we set pollfd first
if (use_pollfd) {
pollfds [0].fd = zmq_pollfd_fd (p_);
pollfds [0].events = POLLIN;
pollfds_index = 1;
}
// Build pollset for poll () system call. // Build pollset for poll () system call.
for (int i = 0; i != nitems_; i++) { for (int i = 0; i != nitems_; i++) {
...@@ -792,35 +1202,28 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -792,35 +1202,28 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
return -1; return -1;
} }
if (thread_safe) { // We already handled the thread safe sockets
if (!items_ [i].fd) { if (!thread_safe) {
if (pollfds != spollfds)
free (pollfds);
errno = EINVAL;
return -1;
}
pollfds [i].fd = items_ [i].fd;
}
else {
size_t zmq_fd_size = sizeof (zmq::fd_t); size_t zmq_fd_size = sizeof (zmq::fd_t);
if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &pollfds [i].fd, if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &pollfds [pollfds_index].fd,
&zmq_fd_size) == -1) { &zmq_fd_size) == -1) {
if (pollfds != spollfds) if (pollfds != spollfds)
free (pollfds); free (pollfds);
return -1; return -1;
} }
pollfds [pollfds_index].events = items_ [i].events ? POLLIN : 0;
pollfds_index++;
} }
pollfds [i].events = items_ [i].events ? POLLIN : 0;
} }
// Else, the poll item is a raw file descriptor. Just convert the // Else, the poll item is a raw file descriptor. Just convert the
// events to normal POLLIN/POLLOUT for poll (). // events to normal POLLIN/POLLOUT for poll ().
else { else {
pollfds [i].fd = items_ [i].fd; pollfds [pollfds_index].fd = items_ [i].fd;
pollfds [i].events = pollfds [pollfds_index].events =
(items_ [i].events & ZMQ_POLLIN ? POLLIN : 0) | (items_ [i].events & ZMQ_POLLIN ? POLLIN : 0) |
(items_ [i].events & ZMQ_POLLOUT ? POLLOUT : 0) | (items_ [i].events & ZMQ_POLLOUT ? POLLOUT : 0) |
(items_ [i].events & ZMQ_POLLPRI ? POLLPRI : 0); (items_ [i].events & ZMQ_POLLPRI ? POLLPRI : 0);
pollfds_index++;
} }
} }
...@@ -840,7 +1243,7 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -840,7 +1243,7 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
// Wait for events. // Wait for events.
while (true) { while (true) {
int rc = poll (pollfds, nitems_, timeout); int rc = poll (pollfds, pollfds_size, timeout);
if (rc == -1 && errno == EINTR) { if (rc == -1 && errno == EINTR) {
if (pollfds != spollfds) if (pollfds != spollfds)
free (pollfds); free (pollfds);
...@@ -849,6 +1252,11 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -849,6 +1252,11 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
errno_assert (rc >= 0); errno_assert (rc >= 0);
break; break;
} }
// Receive the signal from pollfd
if (use_pollfd && pollfds[0].revents & POLLIN)
zmq_pollfd_recv (p_);
// Check for the events. // Check for the events.
for (int i = 0; i != nitems_; i++) { for (int i = 0; i != nitems_; i++) {
...@@ -959,6 +1367,25 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -959,6 +1367,25 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
fd_set pollset_err; fd_set pollset_err;
FD_ZERO (&pollset_err); FD_ZERO (&pollset_err);
bool use_pollfd = false;
for (int i = 0; i != nitems_; i++) {
if (items_ [i].socket) {
int thread_safe;
size_t thread_safe_size = sizeof(int);
if (zmq_getsockopt (items_ [i].socket, ZMQ_THREAD_SAFE, &thread_safe,
&thread_safe_size) == -1)
return -1;
if (thread_safe && items_ [i].events) {
use_pollfd = true;
FD_SET (zmq_pollfd_fd (p_), &pollset_in);
break;
}
}
}
zmq::fd_t maxfd = 0; zmq::fd_t maxfd = 0;
// Build the fd_sets for passing to select (). // Build the fd_sets for passing to select ().
...@@ -974,28 +1401,20 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -974,28 +1401,20 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
&thread_safe_size) == -1) &thread_safe_size) == -1)
return -1; return -1;
if (!thread_safe) {
zmq::fd_t notify_fd; zmq::fd_t notify_fd;
if (thread_safe) {
if (!items_ [i].fd) {
errno = EINVAL;
return -1;
}
notify_fd = items_ [i].fd;
}
else {
size_t zmq_fd_size = sizeof (zmq::fd_t); size_t zmq_fd_size = sizeof (zmq::fd_t);
if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &notify_fd, if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &notify_fd,
&zmq_fd_size) == -1) &zmq_fd_size) == -1)
return -1; return -1;
}
if (items_ [i].events) { if (items_ [i].events) {
FD_SET (notify_fd, &pollset_in); FD_SET (notify_fd, &pollset_in);
if (maxfd < notify_fd) if (maxfd < notify_fd)
maxfd = notify_fd; maxfd = notify_fd;
} }
} }
}
// Else, the poll item is a raw file descriptor. Convert the poll item // Else, the poll item is a raw file descriptor. Convert the poll item
// events to the appropriate fd_sets. // events to the appropriate fd_sets.
else { else {
...@@ -1055,6 +1474,9 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_) ...@@ -1055,6 +1474,9 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
break; break;
} }
if (use_pollfd && FD_ISSET (zmq_pollfd_fd (p_), &inset))
zmq_pollfd_recv (p_);
// Check for the events. // Check for the events.
for (int i = 0; i != nitems_; i++) { for (int i = 0; i != nitems_; i++) {
......
tests/test_thread_safe_polling.cpp
View file @ 709a1e9a
...@@ -50,8 +50,8 @@ int main (void) ...@@ -50,8 +50,8 @@ int main (void)
assert (rc == 0); assert (rc == 0);
zmq_pollitem_t items[] = { zmq_pollitem_t items[] = {
{server, zmq_pollfd_fd(pollfd), ZMQ_POLLIN, 0}, {server, 0, ZMQ_POLLIN, 0},
{server2, zmq_pollfd_fd(pollfd), ZMQ_POLLIN, 0}}; {server2, 0, ZMQ_POLLIN, 0}};
rc = zmq_bind (server, "tcp://127.0.0.1:5560"); rc = zmq_bind (server, "tcp://127.0.0.1:5560");
assert (rc == 0); assert (rc == 0);
...@@ -63,7 +63,7 @@ int main (void) ...@@ -63,7 +63,7 @@ int main (void)
assert (rc == 0); assert (rc == 0);
rc = zmq_poll (items, 2, -1); rc = zmq_pollfd_poll (pollfd, items, 2, -1);
assert (rc == 1); assert (rc == 1);
assert (items[0].revents == ZMQ_POLLIN); assert (items[0].revents == ZMQ_POLLIN);
...@@ -74,7 +74,7 @@ int main (void) ...@@ -74,7 +74,7 @@ int main (void)
rc = zmq_msg_recv(&msg, server, ZMQ_DONTWAIT); rc = zmq_msg_recv(&msg, server, ZMQ_DONTWAIT);
assert (rc == 1); assert (rc == 1);
rc = zmq_poll (items, 2, -1); rc = zmq_pollfd_poll (pollfd, items, 2, -1);
assert (rc == 1); assert (rc == 1);
assert (items[0].revents == 0); assert (items[0].revents == 0);
...@@ -83,7 +83,7 @@ int main (void) ...@@ -83,7 +83,7 @@ int main (void)
rc = zmq_msg_recv(&msg, server2, ZMQ_DONTWAIT); rc = zmq_msg_recv(&msg, server2, ZMQ_DONTWAIT);
assert (rc == 1); assert (rc == 1);
rc = zmq_poll (items, 2, 0); rc = zmq_pollfd_poll (pollfd, items, 2, 0);
assert (rc == 0); assert (rc == 0);
assert (items[0].revents == 0); assert (items[0].revents == 0);
......
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