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authorMicah Anderson <micah@riseup.net>2014-08-11 16:30:52 -0400
committerMicah Anderson <micah@riseup.net>2014-08-11 16:30:52 -0400
commit686958a9db9b140c9665af8fd001e7032a37a46e (patch)
treec0f1a7b4f7d1ffc12ce54271da73edefee18e5b6 /src/kqueue.cpp
initial debian package import
Diffstat (limited to 'src/kqueue.cpp')
-rw-r--r--src/kqueue.cpp214
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diff --git a/src/kqueue.cpp b/src/kqueue.cpp
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+/*
+ 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 "kqueue.hpp"
+#if defined ZMQ_USE_KQUEUE
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/event.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <algorithm>
+#include <new>
+
+#include "kqueue.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+#include "likely.hpp"
+
+// NetBSD defines (struct kevent).udata as intptr_t, everyone else
+// as void *.
+#if defined ZMQ_HAVE_NETBSD
+#define kevent_udata_t intptr_t
+#else
+#define kevent_udata_t void *
+#endif
+
+zmq::kqueue_t::kqueue_t () :
+ stopping (false)
+{
+ // Create event queue
+ kqueue_fd = kqueue ();
+ errno_assert (kqueue_fd != -1);
+#ifdef HAVE_FORK
+ pid = getpid();
+#endif
+}
+
+zmq::kqueue_t::~kqueue_t ()
+{
+ worker.stop ();
+ close (kqueue_fd);
+}
+
+void zmq::kqueue_t::kevent_add (fd_t fd_, short filter_, void *udata_)
+{
+ struct kevent ev;
+
+ EV_SET (&ev, fd_, filter_, EV_ADD, 0, 0, (kevent_udata_t)udata_);
+ int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
+ errno_assert (rc != -1);
+}
+
+void zmq::kqueue_t::kevent_delete (fd_t fd_, short filter_)
+{
+ struct kevent ev;
+
+ EV_SET (&ev, fd_, filter_, EV_DELETE, 0, 0, 0);
+ int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
+ errno_assert (rc != -1);
+}
+
+zmq::kqueue_t::handle_t zmq::kqueue_t::add_fd (fd_t fd_,
+ i_poll_events *reactor_)
+{
+ poll_entry_t *pe = new (std::nothrow) poll_entry_t;
+ alloc_assert (pe);
+
+ pe->fd = fd_;
+ pe->flag_pollin = 0;
+ pe->flag_pollout = 0;
+ pe->reactor = reactor_;
+
+ adjust_load (1);
+
+ return pe;
+}
+
+void zmq::kqueue_t::rm_fd (handle_t handle_)
+{
+ poll_entry_t *pe = (poll_entry_t*) handle_;
+ if (pe->flag_pollin)
+ kevent_delete (pe->fd, EVFILT_READ);
+ if (pe->flag_pollout)
+ kevent_delete (pe->fd, EVFILT_WRITE);
+ pe->fd = retired_fd;
+ retired.push_back (pe);
+
+ adjust_load (-1);
+}
+
+void zmq::kqueue_t::set_pollin (handle_t handle_)
+{
+ poll_entry_t *pe = (poll_entry_t*) handle_;
+ if (likely (!pe->flag_pollin)) {
+ pe->flag_pollin = true;
+ kevent_add (pe->fd, EVFILT_READ, pe);
+ }
+}
+
+void zmq::kqueue_t::reset_pollin (handle_t handle_)
+{
+ poll_entry_t *pe = (poll_entry_t*) handle_;
+ if (likely (pe->flag_pollin)) {
+ pe->flag_pollin = false;
+ kevent_delete (pe->fd, EVFILT_READ);
+ }
+}
+
+void zmq::kqueue_t::set_pollout (handle_t handle_)
+{
+ poll_entry_t *pe = (poll_entry_t*) handle_;
+ if (likely (!pe->flag_pollout)) {
+ pe->flag_pollout = true;
+ kevent_add (pe->fd, EVFILT_WRITE, pe);
+ }
+}
+
+void zmq::kqueue_t::reset_pollout (handle_t handle_)
+{
+ poll_entry_t *pe = (poll_entry_t*) handle_;
+ if (likely (pe->flag_pollout)) {
+ pe->flag_pollout = false;
+ kevent_delete (pe->fd, EVFILT_WRITE);
+ }
+}
+
+void zmq::kqueue_t::start ()
+{
+ worker.start (worker_routine, this);
+}
+
+void zmq::kqueue_t::stop ()
+{
+ stopping = true;
+}
+
+int zmq::kqueue_t::max_fds ()
+{
+ return -1;
+}
+
+void zmq::kqueue_t::loop ()
+{
+ while (!stopping) {
+
+ // Execute any due timers.
+ int timeout = (int) execute_timers ();
+
+ // Wait for events.
+ struct kevent ev_buf [max_io_events];
+ timespec ts = {timeout / 1000, (timeout % 1000) * 1000000};
+ int n = kevent (kqueue_fd, NULL, 0, &ev_buf [0], max_io_events,
+ timeout ? &ts: NULL);
+#ifdef HAVE_FORK
+ if (unlikely(pid != getpid())) {
+ //printf("zmq::kqueue_t::loop aborting on forked child %d\n", (int)getpid());
+ // simply exit the loop in a forked process.
+ return;
+ }
+#endif
+ if (n == -1) {
+ errno_assert (errno == EINTR);
+ continue;
+ }
+
+ for (int i = 0; i < n; i ++) {
+ poll_entry_t *pe = (poll_entry_t*) ev_buf [i].udata;
+
+ if (pe->fd == retired_fd)
+ continue;
+ if (ev_buf [i].flags & EV_EOF)
+ pe->reactor->in_event ();
+ if (pe->fd == retired_fd)
+ continue;
+ if (ev_buf [i].filter == EVFILT_WRITE)
+ pe->reactor->out_event ();
+ if (pe->fd == retired_fd)
+ continue;
+ if (ev_buf [i].filter == EVFILT_READ)
+ pe->reactor->in_event ();
+ }
+
+ // Destroy retired event sources.
+ for (retired_t::iterator it = retired.begin (); it != retired.end ();
+ ++it)
+ delete *it;
+ retired.clear ();
+ }
+}
+
+void zmq::kqueue_t::worker_routine (void *arg_)
+{
+ ((kqueue_t*) arg_)->loop ();
+}
+
+#endif