poller is a concept now rather than virtualised class

src/Makefile.am

@@ -85,7 +85,6 @@ libzmq_la_SOURCES = $(pgm_sources) \
     ip.hpp \
     i_endpoint.hpp \
     i_engine.hpp \
-    i_poller.hpp \
     i_poll_events.hpp \
     i_signaler.hpp \
     kqueue.hpp \
@@ -100,6 +99,7 @@ libzmq_la_SOURCES = $(pgm_sources) \
     pipe.hpp \
     platform.hpp \
     poll.hpp \
+    poller.hpp \
     p2p.hpp \
     pub.hpp \
     rep.hpp \

src/devpoll.cpp

@@ -69,7 +69,8 @@ void zmq::devpoll_t::devpoll_ctl (fd_t fd_, short events_)
     zmq_assert (rc == sizeof pfd);
 }
 
-zmq::handle_t zmq::devpoll_t::add_fd (fd_t fd_, i_poll_events *reactor_)
+zmq::devpoll_t::handle_t zmq::devpoll_t::add_fd (fd_t fd_,
+    i_poll_events *reactor_)
 {
     assert (!fd_table [fd_].valid);
 
@@ -84,17 +85,15 @@ zmq::handle_t zmq::devpoll_t::add_fd (fd_t fd_, i_poll_events *reactor_)
     //  Increase the load metric of the thread.
     load.add (1);
 
-    handle_t handle;
-    handle.fd = fd_;
-    return handle;
+    return fd_;
 }
 
 void zmq::devpoll_t::rm_fd (handle_t handle_)
 {
-    assert (fd_table [handle_.fd].valid);
+    assert (fd_table [handle_].valid);
 
-    devpoll_ctl (handle_.fd, POLLREMOVE);
-    fd_table [handle_.fd].valid = false;
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].valid = false;
 
     //  Decrease the load metric of the thread.
     load.sub (1);
@@ -102,34 +101,30 @@ void zmq::devpoll_t::rm_fd (handle_t handle_)
 
 void zmq::devpoll_t::set_pollin (handle_t handle_)
 {
-    fd_t fd = handle_.fd;
-    devpoll_ctl (fd, POLLREMOVE);
-    fd_table [fd].events |= POLLIN;
-    devpoll_ctl (fd, fd_table [fd].events);
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events |= POLLIN;
+    devpoll_ctl (handle_, fd_table [handle_].events);
 }
 
 void zmq::devpoll_t::reset_pollin (handle_t handle_)
 {
-    fd_t fd = handle_.fd;
-    devpoll_ctl (fd, POLLREMOVE);
-    fd_table [fd].events &= ~((short) POLLIN);
-    devpoll_ctl (fd, fd_table [fd].events);
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events &= ~((short) POLLIN);
+    devpoll_ctl (handle_, fd_table [handle_].events);
 }
 
 void zmq::devpoll_t::set_pollout (handle_t handle_)
 {
-    fd_t fd = handle_.fd;
-    devpoll_ctl (fd, POLLREMOVE);
-    fd_table [fd].events |= POLLOUT;
-    devpoll_ctl (fd, fd_table [fd].events);
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events |= POLLOUT;
+    devpoll_ctl (handle_, fd_table [handle_].events);
 }
 
 void zmq::devpoll_t::reset_pollout (handle_t handle_)
 {
-    fd_t fd = handle_.fd;
-    devpoll_ctl (fd, POLLREMOVE);
-    fd_table [fd].events &= ~((short) POLLOUT);
-    devpoll_ctl (fd, fd_table [fd].events);
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events &= ~((short) POLLOUT);
+    devpoll_ctl (handle_, fd_table [handle_].events);
 }
 
 void zmq::devpoll_t::add_timer (i_poll_events *events_)

src/devpoll.hpp

@@ -26,7 +26,6 @@
 
 #include <vector>
 
-#include "i_poller.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "atomic_counter.hpp"
@@ -37,22 +36,24 @@ namespace zmq
     //  Implements socket polling mechanism using the Solaris-specific
     //  "/dev/poll" interface.
 
-    class devpoll_t : public i_poller
+    class devpoll_t
     {
     public:
 
+        typedef fd_t handle_t;
+
         devpoll_t ();
         ~devpoll_t ();
 
-        //  i_poller implementation.
-        handle_t add_fd (fd_t fd_, i_poll_events *events_);
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
         void rm_fd (handle_t handle_);
         void set_pollin (handle_t handle_);
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (i_poll_events *events_);
-        void cancel_timer (i_poll_events *events_);
+        void add_timer (struct i_poll_events *events_);
+        void cancel_timer (struct i_poll_events *events_);
         int get_load ();
         void start ();
         void stop ();

src/epoll.cpp

@@ -52,7 +52,7 @@ zmq::epoll_t::~epoll_t ()
         delete *it;
 }
 
-zmq::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
+zmq::epoll_t::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
 {
     poll_entry_t *pe = new poll_entry_t;
     zmq_assert (pe != NULL);
@@ -72,14 +72,12 @@ zmq::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
     //  Increase the load metric of the thread.
     load.add (1);
 
-    handle_t handle;
-    handle.ptr = pe;
-    return handle;
+    return pe;
 }
 
 void zmq::epoll_t::rm_fd (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     int rc = epoll_ctl (epoll_fd, EPOLL_CTL_DEL, pe->fd, &pe->ev);
     errno_assert (rc != -1);
     pe->fd = retired_fd;
@@ -91,7 +89,7 @@ void zmq::epoll_t::rm_fd (handle_t handle_)
 
 void zmq::epoll_t::set_pollin (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     pe->ev.events |= EPOLLIN;
     int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
     errno_assert (rc != -1);
@@ -99,7 +97,7 @@ void zmq::epoll_t::set_pollin (handle_t handle_)
 
 void zmq::epoll_t::reset_pollin (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     pe->ev.events &= ~((short) EPOLLIN);
     int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
     errno_assert (rc != -1);
@@ -107,7 +105,7 @@ void zmq::epoll_t::reset_pollin (handle_t handle_)
 
 void zmq::epoll_t::set_pollout (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     pe->ev.events |= EPOLLOUT;
     int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
     errno_assert (rc != -1);
@@ -115,7 +113,7 @@ void zmq::epoll_t::set_pollout (handle_t handle_)
 
 void zmq::epoll_t::reset_pollout (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     pe->ev.events &= ~((short) EPOLLOUT);
     int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
     errno_assert (rc != -1);

src/epoll.hpp

@@ -27,8 +27,6 @@
 #include <vector>
 #include <sys/epoll.h>
 
-#include "i_poller.hpp"
-//#include "i_poll_events.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "atomic_counter.hpp"
@@ -39,22 +37,24 @@ namespace zmq
     //  This class implements socket polling mechanism using the Linux-specific
     //  epoll mechanism.
 
-    class epoll_t : public i_poller
+    class epoll_t
     {
     public:
 
+        typedef void* handle_t;
+
         epoll_t ();
         ~epoll_t ();
 
-        //  i_poller implementation.
-        handle_t add_fd (fd_t fd_, i_poll_events *events_);
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
         void rm_fd (handle_t handle_);
         void set_pollin (handle_t handle_);
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (i_poll_events *events_);
-        void cancel_timer (i_poll_events *events_);
+        void add_timer (struct i_poll_events *events_);
+        void cancel_timer (struct i_poll_events *events_);
         int get_load ();
         void start ();
         void stop ();

src/i_poller.hpp

-/*
-    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/>.
-*/
-
-#ifndef __ZMQ_I_POLLER_HPP_INCLUDED__
-#define __ZMQ_I_POLLER_HPP_INCLUDED__
-
-#include "fd.hpp"
-
-namespace zmq
-{
-
-    union handle_t
-    {
-        fd_t fd;
-        void *ptr;
-    };
-
-    //  Virtual interface to be used when polling on file descriptors.
-
-    struct i_poller
-    {
-        virtual ~i_poller () {};
-
-        //  Add file descriptor to the polling set. Return handle
-        //  representing the descriptor. 'events' interface will be used
-        //  to invoke callback functions when event occurs.
-        virtual handle_t add_fd (fd_t fd_, struct i_poll_events *events_) = 0;
-
-        //  Remove file descriptor identified by handle from the polling set.
-        virtual void rm_fd (handle_t handle_) = 0;
-
-        //  Start polling for input from socket.
-        virtual void set_pollin (handle_t handle_) = 0;
-
-        //  Stop polling for input from socket.
-        virtual void reset_pollin (handle_t handle_) = 0;
-
-        //  Start polling for availability of the socket for writing.
-        virtual void set_pollout (handle_t handle_) = 0;
-
-        //  Stop polling for availability of the socket for writing.
-        virtual void reset_pollout (handle_t handle_) = 0;
-
-        //  Ask to be notified after some time. Actual interval varies between
-        //  0 and max_timer_period ms. Timer is destroyed once it expires or,
-        //  optionally, when cancel_timer is called.
-        virtual void add_timer (struct i_poll_events *events_) = 0;
-
-        //  Cancel the timer set by add_timer method.
-        virtual void cancel_timer (struct i_poll_events *events_) = 0;
-
-        //  Returns load experienced by the I/O thread. Currently it's number
-        //  of file descriptors handled by the poller, in the future we may
-        //  use a metric taking actual traffic on the individual sockets into
-        //  account.
-        virtual int get_load () = 0;
-
-        //  Start the execution of the underlying I/O thread.
-        //  This method is called from a foreign thread.
-        virtual void start () = 0;
-
-        //  Ask underlying I/O thread to stop.
-        virtual void stop () = 0;
-    };
-
-}
-
-#endif

src/io_object.cpp

@@ -36,7 +36,7 @@ void zmq::io_object_t::set_io_thread (io_thread_t *io_thread_)
     poller = io_thread_->get_poller ();
 }
 
-zmq::handle_t zmq::io_object_t::add_fd (fd_t fd_)
+zmq::io_object_t::handle_t zmq::io_object_t::add_fd (fd_t fd_)
 {
     return poller->add_fd (fd_, this);
 }

src/io_object.hpp

@@ -22,7 +22,7 @@
 
 #include <stddef.h>
 
-#include "i_poller.hpp"
+#include "poller.hpp"
 #include "i_poll_events.hpp"
 
 namespace zmq
@@ -41,6 +41,8 @@ namespace zmq
 
     protected:
 
+        typedef poller_t::handle_t handle_t;
+
         //  Derived class can init/swap the underlying I/O thread.
         //  Caution: Remove all the file descriptors from the old I/O thread
         //  before swapping to the new one!
@@ -63,7 +65,7 @@ namespace zmq
 
     private:
 
-        struct i_poller *poller;
+        poller_t *poller;
 
         io_object_t (const io_object_t&);
         void operator = (const io_object_t&);

src/io_thread.cpp

@@ -24,11 +24,6 @@
 #include "platform.hpp"
 #include "err.hpp"
 #include "command.hpp"
-#include "epoll.hpp"
-#include "poll.hpp"
-#include "select.hpp"
-#include "devpoll.hpp"
-#include "kqueue.hpp"
 #include "dispatcher.hpp"
 #include "simple_semaphore.hpp"
 
@@ -36,39 +31,7 @@ zmq::io_thread_t::io_thread_t (dispatcher_t *dispatcher_, int thread_slot_,
       int flags_) :
     object_t (dispatcher_, thread_slot_)
 {
-#if defined ZMQ_FORCE_SELECT
-    poller = new select_t;
-#elif defined ZMQ_FORCE_POLL
-    poller = new poll_t;
-#elif defined ZMQ_FORCE_EPOLL
-    poller = new epoll_t;
-#elif defined ZMQ_FORCE_DEVPOLL
-    poller = new devpoll_t;
-#elif defined ZMQ_FORCE_KQUEUE
-    poller = new kqueue_t;
-#elif defined ZMQ_HAVE_LINUX
-    poller = new epoll_t;
-#elif defined ZMQ_HAVE_WINDOWS
-    poller = new select_t;
-#elif defined ZMQ_HAVE_FREEBSD
-    poller = new kqueue_t;
-#elif defined ZMQ_HAVE_OPENBSD
-    poller = new kqueue_t;
-#elif defined ZMQ_HAVE_SOLARIS
-    poller = new devpoll_t;
-#elif defined ZMQ_HAVE_OSX
-    poller = new kqueue_t;
-#elif defined ZMQ_HAVE_QNXNTO
-    poller = new poll_t;
-#elif defined ZMQ_HAVE_AIX
-    poller = new poll_t;
-#elif defined ZMQ_HAVE_HPUX
-    poller = new devpoll_t;
-#elif defined ZMQ_HAVE_OPENVMS
-    poller = new select_t;
-#else
-#error Unsupported platform
-#endif
+    poller = new poller_t;
     zmq_assert (poller);
 
     signaler_handle = poller->add_fd (signaler.get_fd (), this);
@@ -134,7 +97,7 @@ void zmq::io_thread_t::timer_event ()
     zmq_assert (false);
 }
 
-zmq::i_poller *zmq::io_thread_t::get_poller ()
+zmq::poller_t *zmq::io_thread_t::get_poller ()
 {
     zmq_assert (poller);
     return poller;

src/io_thread.hpp

@@ -23,7 +23,7 @@
 #include <vector>
 
 #include "object.hpp"
-#include "i_poller.hpp"
+#include "poller.hpp"
 #include "i_poll_events.hpp"
 #include "fd_signaler.hpp"
 
@@ -59,7 +59,7 @@ namespace zmq
         void timer_event ();
 
         //  Used by io_objects to retrieve the assciated poller object.
-        struct i_poller *get_poller ();
+        poller_t *get_poller ();
 
         //  Command handlers.
         void process_stop ();
@@ -74,10 +74,10 @@ namespace zmq
         fd_signaler_t signaler;
 
         //  Handle associated with signaler's file descriptor.
-        handle_t signaler_handle;
+        poller_t::handle_t signaler_handle;
 
         //  I/O multiplexing is performed using a poller object.
-        i_poller *poller;
+        poller_t *poller;
     };
 
 }

src/kqueue.cpp

@@ -68,7 +68,8 @@ void zmq::kqueue_t::kevent_delete (fd_t fd_, short filter_)
     errno_assert (rc != -1);
 }
 
-zmq::handle_t zmq::kqueue_t::add_fd (fd_t fd_, i_poll_events *reactor_)
+zmq::kqueue_t::handle_t zmq::kqueue_t::add_fd (fd_t fd_,
+    i_poll_events *reactor_)
 {
     poll_entry_t *pe = new poll_entry_t;
     zmq_assert (pe != NULL);
@@ -78,14 +79,12 @@ zmq::handle_t zmq::kqueue_t::add_fd (fd_t fd_, i_poll_events *reactor_)
     pe->flag_pollout = 0;
     pe->reactor = reactor_;
 
-    handle_t handle;
-    handle.ptr = pe;
-    return handle;
+    return pe;
 }
 
 void zmq::kqueue_t::rm_fd (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     if (pe->flag_pollin)
         kevent_delete (pe->fd, EVFILT_READ);
     if (pe->flag_pollout)
@@ -96,28 +95,28 @@ void zmq::kqueue_t::rm_fd (handle_t handle_)
 
 void zmq::kqueue_t::set_pollin (handle_t handle_)
 {
-    poll_entry_t *pe = (poll_entry_t*) handle_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     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_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     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_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     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_.ptr;
+    poll_entry_t *pe = (poll_entry_t*) handle_;
     pe->flag_pollout = false;
     kevent_delete (pe->fd, EVFILT_WRITE);
 }

src/kqueue.hpp

@@ -26,7 +26,6 @@
 
 #include <vector>
 
-#include "i_poller.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "atomic_counter.hpp"
@@ -37,22 +36,24 @@ namespace zmq
     //  Implements socket polling mechanism using the BSD-specific
     //  kqueue interface.
 
-    class kqueue_t : public i_poller
+    class kqueue_t
     {
     public:
 
+        typedef void* handle_t;
+
         kqueue_t ();
         ~kqueue_t ();
 
-        //  i_poller implementation.
-        handle_t add_fd (fd_t fd_, i_poll_events *events_);
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
         void rm_fd (handle_t handle_);
         void set_pollin (handle_t handle_);
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (i_poll_events *events_);
-        void cancel_timer (i_poll_events *events_);
+        void add_timer (struct i_poll_events *events_);
+        void cancel_timer (struct i_poll_events *events_);
         int get_load ();
         void start ();
         void stop ();

src/poll.cpp

@@ -58,7 +58,7 @@ zmq::poll_t::~poll_t ()
     zmq_assert (load.get () == 0);
 }
 
-zmq::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
+zmq::poll_t::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
 {
     pollfd pfd = {fd_, 0, 0};
     pollset.push_back (pfd);
@@ -70,19 +70,17 @@ zmq::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
     //  Increase the load metric of the thread.
     load.add (1);
 
-    handle_t handle;
-    handle.fd = fd_;
-    return handle;
+    return fd_;
 }
 
 void zmq::poll_t::rm_fd (handle_t handle_)
 {
-    fd_t index = fd_table [handle_.fd].index;
+    fd_t index = fd_table [handle_].index;
     assert (index != retired_fd);
 
     //  Mark the fd as unused.
     pollset [index].fd = retired_fd;
-    fd_table [handle_.fd].index = retired_fd;
+    fd_table [handle_].index = retired_fd;
     retired = true;
 
     //  Decrease the load metric of the thread.
@@ -91,25 +89,25 @@ void zmq::poll_t::rm_fd (handle_t handle_)
 
 void zmq::poll_t::set_pollin (handle_t handle_)
 {
-    int index = fd_table [handle_.fd].index;
+    int index = fd_table [handle_].index;
     pollset [index].events |= POLLIN;
 }
 
 void zmq::poll_t::reset_pollin (handle_t handle_)
 {
-    int index = fd_table [handle_.fd].index;
+    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_.fd].index;
+    int index = fd_table [handle_].index;
     pollset [index].events |= POLLOUT;
 }
 
 void zmq::poll_t::reset_pollout (handle_t handle_)
 {
-    int index = fd_table [handle_.fd].index;
+    int index = fd_table [handle_].index;
     pollset [index].events &= ~((short) POLLOUT);
 }
 

src/poll.hpp

@@ -31,7 +31,6 @@
 #include <stddef.h>
 #include <vector>
 
-#include "i_poller.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "atomic_counter.hpp"
@@ -42,22 +41,24 @@ namespace zmq
     //  Implements socket polling mechanism using the POSIX.1-2001
     //  poll() system call.
 
-    class poll_t : public i_poller
+    class poll_t
     {
     public:
 
+        typedef fd_t handle_t;
+
         poll_t ();
         ~poll_t ();
 
-        //  i_poller implementation.
-        handle_t add_fd (fd_t fd_, i_poll_events *events_);
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
         void rm_fd (handle_t handle_);
         void set_pollin (handle_t handle_);
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (i_poll_events *events_);
-        void cancel_timer (i_poll_events *events_);
+        void add_timer (struct i_poll_events *events_);
+        void cancel_timer (struct i_poll_events *events_);
         int get_load ();
         void start ();
         void stop ();

src/poller.hpp

+/*
+    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/>.
+*/
+
+#ifndef __ZMQ_POLLER_HPP_INCLUDED__
+#define __ZMQ_POLLER_HPP_INCLUDED__
+
+#include "epoll.hpp"
+#include "poll.hpp"
+#include "select.hpp"
+#include "devpoll.hpp"
+#include "kqueue.hpp"
+
+namespace zmq
+{
+
+#if defined ZMQ_FORCE_SELECT
+    typedef select_t poller_t;
+#elif defined ZMQ_FORCE_POLL
+    typedef poll_t poller_t;
+#elif defined ZMQ_FORCE_EPOLL
+    typedef epoll_t poller_t;
+#elif defined ZMQ_FORCE_DEVPOLL
+    typedef devpoll_t poller_t;
+#elif defined ZMQ_FORCE_KQUEUE
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_LINUX
+    typedef epoll_t poller_t;
+#elif defined ZMQ_HAVE_WINDOWS
+    typedef select_t poller_t;
+#elif defined ZMQ_HAVE_FREEBSD
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_OPENBSD
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_SOLARIS
+    typedef devpoll_t poller_t;
+#elif defined ZMQ_HAVE_OSX
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_QNXNTO
+    typedef poll_t poller_t;
+#elif defined ZMQ_HAVE_AIX
+    typedef poll_t poller_t;
+#elif defined ZMQ_HAVE_HPUX
+    typedef devpoll_t poller_t;
+#elif defined ZMQ_HAVE_OPENVMS
+    typedef select_t poller_t;
+#else
+#error Unsupported platform
+#endif
+
+}
+
+#endif

src/select.cpp

@@ -59,7 +59,7 @@ zmq::select_t::~select_t ()
     zmq_assert (load.get () == 0);
 }
 
-zmq::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
+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_};
@@ -75,38 +75,33 @@ zmq::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
     //  Increase the load metric of the thread.
     load.add (1);
 
-    handle_t handle;
-    handle.fd = fd_;
-    return handle;
+    return fd_;
 }
 
 void zmq::select_t::rm_fd (handle_t handle_)
 {
-    //  Get file descriptor.
-    fd_t fd = handle_.fd;
-
     //  Mark the descriptor as retired.
     fd_set_t::iterator it;
     for (it = fds.begin (); it != fds.end (); it ++)
-        if (it->fd == fd)
+        if (it->fd == handle_)
             break;
     zmq_assert (it != fds.end ());
     it->fd = retired_fd;
     retired = true;
 
     //  Stop polling on the descriptor.
-    FD_CLR (fd, &source_set_in);
-    FD_CLR (fd, &source_set_out);
-    FD_CLR (fd, &source_set_err);
+    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 (fd, &readfds);
-    FD_CLR (fd, &writefds);
-    FD_CLR (fd, &exceptfds);
+    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 (fd == maxfd) {
+    if (handle_ == maxfd) {
         maxfd = retired_fd;
         for (fd_set_t::iterator it = fds.begin (); it != fds.end (); it ++)
             if (it->fd > maxfd)
@@ -119,22 +114,22 @@ void zmq::select_t::rm_fd (handle_t handle_)
 
 void zmq::select_t::set_pollin (handle_t handle_)
 {
-    FD_SET (handle_.fd, &source_set_in);
+    FD_SET (handle_, &source_set_in);
 }
 
 void zmq::select_t::reset_pollin (handle_t handle_)
 {
-    FD_CLR (handle_.fd, &source_set_in);
+    FD_CLR (handle_, &source_set_in);
 }
 
 void zmq::select_t::set_pollout (handle_t handle_)
 {
-    FD_SET (handle_.fd, &source_set_out);
+    FD_SET (handle_, &source_set_out);
 }
 
 void zmq::select_t::reset_pollout (handle_t handle_)
 {
-    FD_CLR (handle_.fd, &source_set_out);
+    FD_CLR (handle_, &source_set_out);
 }
 
 void zmq::select_t::add_timer (i_poll_events *events_)

src/select.hpp

@@ -34,7 +34,6 @@
 #include <sys/select.h>
 #endif
 
-#include "i_poller.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "atomic_counter.hpp"
@@ -45,22 +44,24 @@ namespace zmq
     //  Implements socket polling mechanism using POSIX.1-2001 select()
     //  function.
 
-    class select_t : public i_poller
+    class select_t
     {
     public:
 
+        typedef fd_t handle_t;
+
         select_t ();
         ~select_t ();
 
-        //  i_poller implementation.
-        handle_t add_fd (fd_t fd_, i_poll_events *events_);
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
         void rm_fd (handle_t handle_);
         void set_pollin (handle_t handle_);
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (i_poll_events *events_);
-        void cancel_timer (i_poll_events *events_);
+        void add_timer (struct i_poll_events *events_);
+        void cancel_timer (struct i_poll_events *events_);
         int get_load ();
         void start ();
         void stop ();