initial commit

src/poll.cpp

@@ -0,0 +1,205 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "platform.hpp"
+
+#if defined ZS_HAVE_LINUX || defined ZS_HAVE_FREEBSD ||\
+    defined ZS_HAVE_OPENBSD || defined ZS_HAVE_SOLARIS ||\
+    defined ZS_HAVE_OSX || defined ZS_HAVE_QNXNTO ||\
+    defined ZS_HAVE_HPUX || defined ZS_HAVE_AIX
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <poll.h>
+#include <algorithm>
+
+#include "poll.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+zs::poll_t::poll_t () :
+    retired (false),
+    stopping (false)
+{
+    //  Get the limit on open file descriptors. Resize fds so that it
+    //  can hold all descriptors.
+    rlimit rl;
+    int rc = getrlimit (RLIMIT_NOFILE, &rl);
+    errno_assert (rc != -1);
+    fd_table.resize (rl.rlim_cur);
+
+    for (rlim_t i = 0; i < rl.rlim_cur; i ++)
+        fd_table [i].index = retired_fd;
+}
+
+zs::handle_t zs::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
+{
+    pollfd pfd = {fd_, 0, 0};
+    pollset.push_back (pfd);
+    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.
+    load.add (1);
+
+    handle_t handle;
+    handle.fd = fd_;
+    return handle;
+}
+
+void zs::poll_t::rm_fd (handle_t handle_)
+{
+    fd_t index = fd_table [handle_.fd].index;
+    assert (index != retired_fd);
+
+    //  Mark the fd as unused.
+    pollset [index].fd = retired_fd;
+    fd_table [handle_.fd].index = retired_fd;
+    retired = true;
+
+    //  Decrease the load metric of the thread.
+    load.sub (1);
+}
+
+void zs::poll_t::set_pollin (handle_t handle_)
+{
+    int index = fd_table [handle_.fd].index;
+    pollset [index].events |= POLLIN;
+}
+
+void zs::poll_t::reset_pollin (handle_t handle_)
+{
+    int index = fd_table [handle_.fd].index;
+    pollset [index].events &= ~((short) POLLIN);
+}
+
+void zs::poll_t::set_pollout (handle_t handle_)
+{
+    int index = fd_table [handle_.fd].index;
+    pollset [index].events |= POLLOUT;
+}
+
+void zs::poll_t::reset_pollout (handle_t handle_)
+{
+    int index = fd_table [handle_.fd].index;
+    pollset [index].events &= ~((short) POLLOUT);
+}
+
+void zs::poll_t::add_timer (i_poll_events *events_)
+{
+     timers.push_back (events_);
+}
+
+void zs::poll_t::cancel_timer (i_poll_events *events_)
+{
+    timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
+    if (it != timers.end ())
+        timers.erase (it);
+}
+
+int zs::poll_t::get_load ()
+{
+    return load.get ();
+}
+
+void zs::poll_t::start ()
+{
+    worker.start (worker_routine, this);
+}
+
+void zs::poll_t::stop ()
+{
+    stopping = true;
+}
+
+void zs::poll_t::join ()
+{
+    worker.stop ();
+}
+
+void zs::poll_t::loop ()
+{
+    while (!stopping) {
+
+        //  Wait for events.
+        int rc = poll (&pollset [0], pollset.size (),
+            timers.empty () ? -1 : max_timer_period);
+        if (rc == -1 && errno == EINTR)
+            continue;
+        errno_assert (rc != -1);
+
+        //  Handle timer.
+        if (!rc) {
+
+            //  Use local list of timers as timer handlers may fill new timers
+            //  into the original array.
+            timers_t t;
+            std::swap (timers, t);
+
+            //  Trigger all the timers.
+            for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
+                (*it)->timer_event ();
+
+            continue;
+        }
+
+        for (pollset_t::iterator it = pollset.begin ();
+                it != pollset.end (); it ++) {
+
+            zs_assert (!(it->revents & POLLNVAL));
+            if (it->fd == retired_fd)
+               continue;
+            if (it->revents & (POLLERR | POLLHUP))
+                fd_table [it->fd].events->in_event ();
+            if (it->fd == retired_fd)
+               continue;
+            if (it->revents & POLLOUT)
+                fd_table [it->fd].events->out_event ();
+            if (it->fd == retired_fd)
+               continue;
+            if (it->revents & POLLIN)
+                fd_table [it->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 zs::poll_t::worker_routine (void *arg_)
+{
+    ((poll_t*) arg_)->loop ();
+}
+
+#endif