Imported Upstream version 2.0.7.dfsgupstream/2.0.7.dfsg

1 files changed, 234 insertions, 0 deletions

diff --git a/src/select.cpp b/src/select.cpp
new file mode 100644
index 0000000..be5cd47
--- /dev/null
+++ b/src/select.cpp
@@ -0,0 +1,234 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    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"
+
+#include <string.h>
+#include <algorithm>
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "winsock2.h"
+#elif defined ZMQ_HAVE_HPUX
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#elif defined ZMQ_HAVE_OPENVMS
+#include <sys/types.h>
+#include <sys/time.h>
+#else
+#include <sys/select.h>
+#endif
+
+#include "select.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+zmq::select_t::select_t () :
+    maxfd (retired_fd),
+    retired (false),
+    stopping (false)
+{
+    //  Clear file descriptor sets.
+    FD_ZERO (&source_set_in);
+    FD_ZERO (&source_set_out);
+    FD_ZERO (&source_set_err);
+}
+
+zmq::select_t::~select_t ()
+{
+    worker.stop ();
+
+    //  Make sure there are no fds registered on shutdown.
+    zmq_assert (load.get () == 0);
+}
+
+zmq::select_t::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
+{
+    //  Store the file descriptor.
+    fd_entry_t entry = {fd_, events_};
+    fds.push_back (entry);
+
+    //  Start polling on errors.
+    FD_SET (fd_, &source_set_err);
+
+    //  Adjust maxfd if necessary.
+    if (fd_ > maxfd)
+        maxfd = fd_;
+
+    //  Increase the load metric of the thread.
+    load.add (1);
+
+    return fd_;
+}
+
+void zmq::select_t::rm_fd (handle_t handle_)
+{
+    //  Mark the descriptor as retired.
+    fd_set_t::iterator it;
+    for (it = fds.begin (); it != fds.end (); it ++)
+        if (it->fd == handle_)
+            break;
+    zmq_assert (it != fds.end ());
+    it->fd = retired_fd;
+    retired = true;
+
+    //  Stop polling on the descriptor.
+    FD_CLR (handle_, &source_set_in);
+    FD_CLR (handle_, &source_set_out);
+    FD_CLR (handle_, &source_set_err);
+
+    //  Discard all events generated on this file descriptor.
+    FD_CLR (handle_, &readfds);
+    FD_CLR (handle_, &writefds);
+    FD_CLR (handle_, &exceptfds);
+
+    //  Adjust the maxfd attribute if we have removed the
+    //  highest-numbered file descriptor.
+    if (handle_ == maxfd) {
+        maxfd = retired_fd;
+        for (fd_set_t::iterator it = fds.begin (); it != fds.end (); it ++)
+            if (it->fd > maxfd)
+                maxfd = it->fd;
+    }
+
+    //  Decrease the load metric of the thread.
+    load.sub (1);
+}
+
+void zmq::select_t::set_pollin (handle_t handle_)
+{
+    FD_SET (handle_, &source_set_in);
+}
+
+void zmq::select_t::reset_pollin (handle_t handle_)
+{
+    FD_CLR (handle_, &source_set_in);
+}
+
+void zmq::select_t::set_pollout (handle_t handle_)
+{
+    FD_SET (handle_, &source_set_out);
+}
+
+void zmq::select_t::reset_pollout (handle_t handle_)
+{
+    FD_CLR (handle_, &source_set_out);
+}
+
+void zmq::select_t::add_timer (i_poll_events *events_)
+{
+    timers.push_back (events_);
+}
+
+void zmq::select_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 zmq::select_t::get_load ()
+{
+    return load.get ();
+}
+
+void zmq::select_t::start ()
+{
+    worker.start (worker_routine, this);
+}
+
+void zmq::select_t::stop ()
+{
+    stopping = true;
+}
+
+void zmq::select_t::loop ()
+{
+    while (!stopping) {
+
+        //  Intialise the pollsets.
+        memcpy (&readfds, &source_set_in, sizeof source_set_in);
+        memcpy (&writefds, &source_set_out, sizeof source_set_out);
+        memcpy (&exceptfds, &source_set_err, sizeof source_set_err);
+
+        //  Compute the timout interval. Select is free to overwrite the
+        //  value so we have to compute it each time anew.
+        timeval timeout = {max_timer_period / 1000,
+            (max_timer_period % 1000) * 1000};
+
+        //  Wait for events.
+        int rc = select (maxfd + 1, &readfds, &writefds, &exceptfds,
+            timers.empty () ? NULL : &timeout);
+
+#ifdef ZMQ_HAVE_WINDOWS
+        wsa_assert (rc != SOCKET_ERROR);
+#else
+        if (rc == -1 && errno == EINTR)
+            continue;
+        errno_assert (rc != -1);
+#endif
+
+        //  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 (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
+            if (fds [i].fd == retired_fd)
+                continue;
+            if (FD_ISSET (fds [i].fd, &exceptfds))
+                fds [i].events->in_event ();
+            if (fds [i].fd == retired_fd)
+                continue;
+            if (FD_ISSET (fds [i].fd, &writefds))
+                fds [i].events->out_event ();
+            if (fds [i].fd == retired_fd)
+                continue;
+            if (FD_ISSET (fds [i].fd, &readfds))
+                fds [i].events->in_event ();
+        }
+
+        //  Destroy retired event sources.
+        if (retired) {
+            for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
+                if (fds [i].fd == retired_fd) {
+                    fds.erase (fds.begin () + i);
+                    i --;
+                }
+            }
+            retired = false;
+        }
+    }
+}
+
+void zmq::select_t::worker_routine (void *arg_)
+{
+    ((select_t*) arg_)->loop ();
+}