poller_base_t renamed to io_thread_t

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

1 files changed, 174 insertions, 0 deletions

diff --git a/src/io_thread.cpp b/src/io_thread.cpp
new file mode 100644
index 0000000..d6dca8c
--- /dev/null
+++ b/src/io_thread.cpp
@@ -0,0 +1,174 @@
+/*
+    Copyright (c) 2010-2012 250bpm s.r.o.
+    Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of Crossroads project.
+
+    Crossroads 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.
+
+    Crossroads 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 "io_thread.hpp"
+#include "err.hpp"
+
+#include "select.hpp"
+#include "poll.hpp"
+#include "epoll.hpp"
+#include "devpoll.hpp"
+#include "kqueue.hpp"
+
+xs::io_thread_t *xs::io_thread_t::create (xs::ctx_t *ctx_, uint32_t tid_)
+{
+    io_thread_t *result;
+#if defined XS_HAVE_SELECT
+    result = new (std::nothrow) select_t (ctx_, tid_);
+#elif defined XS_HAVE_POLL
+    result = new (std::nothrow) poll_t (ctx_, tid_);
+#elif defined XS_HAVE_EPOLL
+    result = new (std::nothrow) epoll_t (ctx_, tid_);
+#elif defined XS_HAVE_DEVPOLL
+    result = new (std::nothrow) devpoll_t (ctx_, tid_);
+#elif defined XS_HAVE_KQUEUE
+    result = new (std::nothrow) kqueue_t (ctx_, tid_);
+#endif
+    alloc_assert (result);
+    return result;
+}
+
+xs::io_thread_t::io_thread_t (xs::ctx_t *ctx_, uint32_t tid_) :
+    object_t (ctx_, tid_)
+{
+}
+
+xs::io_thread_t::~io_thread_t ()
+{
+}
+
+void xs::io_thread_t::start ()
+{
+    mailbox_handle = add_fd (mailbox.get_fd (), this);
+    set_pollin (mailbox_handle);
+    xstart ();
+}
+
+void xs::io_thread_t::stop ()
+{
+    //  Ask the I/O thread to stop.
+    send_stop ();
+}
+
+void xs::io_thread_t::process_stop ()
+{
+    rm_fd (mailbox_handle);
+    xstop ();
+}
+
+xs::mailbox_t *xs::io_thread_t::get_mailbox ()
+{
+    return &mailbox;
+}
+
+int xs::io_thread_t::get_load ()
+{
+    return load.get ();
+}
+
+void xs::io_thread_t::adjust_load (int amount_)
+{
+    if (amount_ > 0)
+        load.add (amount_);
+    else if (amount_ < 0)
+        load.sub (-amount_);
+}
+
+xs::handle_t xs::io_thread_t::add_timer (int timeout_, i_poll_events *sink_)
+{
+    uint64_t expiration = clock.now_ms () + timeout_;
+    timer_info_t info = {sink_, timers_t::iterator ()};
+    timers_t::iterator it = timers.insert (
+        timers_t::value_type (expiration, info));
+    it->second.self = it;
+    return (handle_t) &(it->second);
+}
+
+void xs::io_thread_t::rm_timer (handle_t handle_)
+{
+    timer_info_t *info = (timer_info_t*) handle_;
+    timers.erase (info->self);
+}
+
+uint64_t xs::io_thread_t::execute_timers ()
+{
+    //  Fast track.
+    if (timers.empty ())
+        return 0;
+
+    //  Get the current time.
+    uint64_t current = clock.now_ms ();
+
+    //   Execute the timers that are already due.
+    timers_t::iterator it = timers.begin ();
+    while (it != timers.end ()) {
+
+        //  If we have to wait to execute the item, same will be true about
+        //  all the following items (multimap is sorted). Thus we can stop
+        //  checking the subsequent timers and return the time to wait for
+        //  the next timer (at least 1ms).
+        if (it->first > current)
+            return it->first - current;
+
+        //  Trigger the timer.
+        it->second.sink->timer_event ((handle_t) &it->second);
+
+        //  Remove it from the list of active timers.
+        timers_t::iterator o = it;
+        ++it;
+        timers.erase (o);
+    }
+
+    //  There are no more timers.
+    return 0;
+}
+
+void xs::io_thread_t::in_event (fd_t fd_)
+{
+    //  TODO: Do we want to limit number of commands I/O thread can
+    //  process in a single go?
+
+    while (true) {
+
+        //  Get the next command. If there is none, exit.
+        command_t cmd;
+        int rc = mailbox.recv (&cmd, 0);
+        if (rc != 0 && errno == EINTR)
+            continue;
+        if (rc != 0 && errno == EAGAIN)
+            break;
+        errno_assert (rc == 0);
+
+        //  Process the command.
+        cmd.destination->process_command (cmd);
+    }
+}
+
+void xs::io_thread_t::out_event (fd_t fd_)
+{
+    //  We are never polling for POLLOUT here. This function is never called.
+    xs_assert (false);
+}
+
+void xs::io_thread_t::timer_event (handle_t handle_)
+{
+    //  No timers here. This function is never called.
+    xs_assert (false);
+}