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Merge pull request #2533 from bjovke/my_work

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Problem: FD set copying for Windows still not optimal in some places.
This commit is contained in:
Luca Boccassi 2017-04-14 16:01:53 +01:00 committed by GitHub
commit e8be2e9d60
2 changed files with 30 additions and 3 deletions
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20
src/select.cpp
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@ -401,16 +401,36 @@ zmq::select_t::fds_set_t::fds_set_t ()
zmq::select_t::fds_set_t::fds_set_t (const fds_set_t& other_)
{
#if defined ZMQ_HAVE_WINDOWS
// On Windows we don't need to copy the whole fd_set.
// SOCKETS are continuous from the beginning of fd_array in fd_set.
// We just need to copy fd_count elements of fd_array.
// We gain huge memcpy() improvement if number of used SOCKETs is much lower than FD_SETSIZE.
memcpy (&read, &other_.read, (char *) (other_.read.fd_array + other_.read.fd_count ) - (char *) &other_.read );
memcpy (&write, &other_.write, (char *) (other_.write.fd_array + other_.write.fd_count) - (char *) &other_.write);
memcpy (&error, &other_.error, (char *) (other_.error.fd_array + other_.error.fd_count) - (char *) &other_.error);
#else
memcpy (&read, &other_.read, sizeof other_.read);
memcpy (&write, &other_.write, sizeof other_.write);
memcpy (&error, &other_.error, sizeof other_.error);
#endif
}
zmq::select_t::fds_set_t& zmq::select_t::fds_set_t::operator= (const fds_set_t& other_)
{
#if defined ZMQ_HAVE_WINDOWS
// On Windows we don't need to copy the whole fd_set.
// SOCKETS are continuous from the beginning of fd_array in fd_set.
// We just need to copy fd_count elements of fd_array.
// We gain huge memcpy() improvement if number of used SOCKETs is much lower than FD_SETSIZE.
memcpy (&read, &other_.read, (char *) (other_.read.fd_array + other_.read.fd_count ) - (char *) &other_.read );
memcpy (&write, &other_.write, (char *) (other_.write.fd_array + other_.write.fd_count) - (char *) &other_.write);
memcpy (&error, &other_.error, (char *) (other_.error.fd_array + other_.error.fd_count) - (char *) &other_.error);
#else
memcpy (&read, &other_.read, sizeof other_.read);
memcpy (&write, &other_.write, sizeof other_.write);
memcpy (&error, &other_.error, sizeof other_.error);
#endif
return *this;
}

13
src/zmq.cpp
View File

@ -1110,10 +1110,14 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long 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
// On Windows we don't need to copy the whole fd_set.
// SOCKETS are continuous from the beginning of fd_array in fd_set.
// We just need to copy fd_count elements of fd_array.
// We gain huge memcpy() improvement if number of used SOCKETs is much lower than FD_SETSIZE.
memcpy (&inset, &pollset_in , (char *) (pollset_in.fd_array + pollset_in.fd_count ) - (char *) &pollset_in );
memcpy (&outset, &pollset_out, (char *) (pollset_out.fd_array + pollset_out.fd_count) - (char *) &pollset_out);
memcpy (&errset, &pollset_err, (char *) (pollset_err.fd_array + pollset_err.fd_count) - (char *) &pollset_err);
int rc = select (0, &inset, &outset, &errset, ptimeout);
if (unlikely (rc == SOCKET_ERROR)) {
errno = zmq::wsa_error_to_errno (WSAGetLastError ());
@ -1121,6 +1125,9 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
return -1;
}
#else
memcpy (&inset, &pollset_in, sizeof (fd_set));
memcpy (&outset, &pollset_out, sizeof (fd_set));
memcpy (&errset, &pollset_err, sizeof (fd_set));
int rc = select (maxfd + 1, &inset, &outset, &errset, ptimeout);
if (unlikely (rc == -1)) {
errno_assert (errno == EINTR || errno == EBADF);