diff options
Diffstat (limited to 'src/poll.cpp')
| -rw-r--r-- | src/poll.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/poll.cpp b/src/poll.cpp new file mode 100644 index 0000000..cf23afc --- /dev/null +++ b/src/poll.cpp @@ -0,0 +1,179 @@ +/* + Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file + + This file is part of 0MQ. + + 0MQ is free software; you can redistribute it and/or modify it under + the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + 0MQ is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "poll.hpp" +#if defined ZMQ_USE_POLL + +#include <sys/types.h> +#include <sys/time.h> +#include <poll.h> +#include <algorithm> + +#include "poll.hpp" +#include "err.hpp" +#include "config.hpp" +#include "i_poll_events.hpp" + +zmq::poll_t::poll_t () : + retired (false), + stopping (false) +{ +} + +zmq::poll_t::~poll_t () +{ + worker.stop (); +} + +zmq::poll_t::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_) +{ + // If the file descriptor table is too small expand it. + fd_table_t::size_type sz = fd_table.size (); + if (sz <= (fd_table_t::size_type) fd_) { + fd_table.resize (fd_ + 1); + while (sz != (fd_table_t::size_type) (fd_ + 1)) { + fd_table [sz].index = retired_fd; + ++sz; + } + } + + pollfd pfd = {fd_, 0, 0}; + pollset.push_back (pfd); + zmq_assert (fd_table [fd_].index == retired_fd); + + fd_table [fd_].index = pollset.size() - 1; + fd_table [fd_].events = events_; + + // Increase the load metric of the thread. + adjust_load (1); + + return fd_; +} + +void zmq::poll_t::rm_fd (handle_t handle_) +{ + fd_t index = fd_table [handle_].index; + zmq_assert (index != retired_fd); + + // Mark the fd as unused. + pollset [index].fd = retired_fd; + fd_table [handle_].index = retired_fd; + retired = true; + + // Decrease the load metric of the thread. + adjust_load (-1); +} + +void zmq::poll_t::set_pollin (handle_t handle_) +{ + int index = fd_table [handle_].index; + pollset [index].events |= POLLIN; +} + +void zmq::poll_t::reset_pollin (handle_t handle_) +{ + int index = fd_table [handle_].index; + pollset [index].events &= ~((short) POLLIN); +} + +void zmq::poll_t::set_pollout (handle_t handle_) +{ + int index = fd_table [handle_].index; + pollset [index].events |= POLLOUT; +} + +void zmq::poll_t::reset_pollout (handle_t handle_) +{ + int index = fd_table [handle_].index; + pollset [index].events &= ~((short) POLLOUT); +} + +void zmq::poll_t::start () +{ + worker.start (worker_routine, this); +} + +void zmq::poll_t::stop () +{ + stopping = true; +} + +int zmq::poll_t::max_fds () +{ + return -1; +} + +void zmq::poll_t::loop () +{ + while (!stopping) { + + // Execute any due timers. + int timeout = (int) execute_timers (); + + // Wait for events. + int rc = poll (&pollset [0], pollset.size (), timeout ? timeout : -1); + if (rc == -1) { + errno_assert (errno == EINTR); + continue; + } + + // If there are no events (i.e. it's a timeout) there's no point + // in checking the pollset. + if (rc == 0) + continue; + + for (pollset_t::size_type i = 0; i != pollset.size (); i++) { + + zmq_assert (!(pollset [i].revents & POLLNVAL)); + if (pollset [i].fd == retired_fd) + continue; + if (pollset [i].revents & (POLLERR | POLLHUP)) + fd_table [pollset [i].fd].events->in_event (); + if (pollset [i].fd == retired_fd) + continue; + if (pollset [i].revents & POLLOUT) + fd_table [pollset [i].fd].events->out_event (); + if (pollset [i].fd == retired_fd) + continue; + if (pollset [i].revents & POLLIN) + fd_table [pollset [i].fd].events->in_event (); + } + + // Clean up the pollset and update the fd_table accordingly. + if (retired) { + pollset_t::size_type i = 0; + while (i < pollset.size ()) { + if (pollset [i].fd == retired_fd) + pollset.erase (pollset.begin () + i); + else { + fd_table [pollset [i].fd].index = i; + i ++; + } + } + retired = false; + } + } +} + +void zmq::poll_t::worker_routine (void *arg_) +{ + ((poll_t*) arg_)->loop (); +} + +#endif |