add pollset poller in AIX

add a new poller named pollset which will get benefit of performance in AIX platform.

CMakeLists.txt

@@ -77,7 +77,7 @@ if (WITH_MILITANT)
 endif()
 
 set (POLLER "" CACHE STRING "Choose polling system. valid values are
-                            kqueue, epoll, devpoll, poll or select [default=autodetect]")
+                            kqueue, pollset, epoll, devpoll, poll or select [default=autodetect]")
 
 include (CheckFunctionExists)
 include (CheckTypeSize)
@@ -91,6 +91,15 @@ if (POLLER STREQUAL "")
     endif()
 endif ()
 
+if (POLLER STREQUAL "")
+    set (CMAKE_REQUIRED_INCLUDES sys/pollset.h)
+    check_function_exists (pollset_create HAVE_POLLSET)
+    set (CMAKE_REQUIRED_INCLUDES)
+    if (HAVE_POLLSET)
+        set (POLLER "pollset")
+    endif()
+endif ()
+
 if (POLLER STREQUAL "")
     set (CMAKE_REQUIRED_INCLUDES sys/epoll.h)
     check_function_exists (epoll_create HAVE_EPOLL)
@@ -136,6 +145,7 @@ if (POLLER STREQUAL "")
 endif ()
 
 if (POLLER STREQUAL "kqueue"
+ OR POLLER STREQUAL "pollset"
  OR POLLER STREQUAL "epoll"
  OR POLLER STREQUAL "devpoll"
  OR POLLER STREQUAL "poll"
@@ -468,6 +478,7 @@ set (cxx-sources
         plain_server.cpp
         poll.cpp
         poller_base.cpp
+		pollset.cpp
         precompiled.cpp
         proxy.cpp
         pub.cpp

Makefile.am

@@ -133,6 +133,8 @@ src_libzmq_la_SOURCES = \
 	src/poller.hpp \
 	src/poller_base.cpp \
 	src/poller_base.hpp \
+	src/pollset.cpp \
+	src/pollset.hpp \
 	src/precompiled.cpp \
 	src/precompiled.hpp \
 	src/proxy.cpp \

acinclude.m4

@@ -794,6 +794,22 @@ kqueue();
     )
 }])
 
+dnl ################################################################################
+dnl # LIBZMQ_CHECK_POLLER_POLLSET([action-if-found], [action-if-not-found])        #
+dnl # Checks pollset polling system                                                #
+dnl ################################################################################
+AC_DEFUN([LIBZMQ_CHECK_POLLER_POLLSET], [{
+    AC_LINK_IFELSE([
+        AC_LANG_PROGRAM([
+#include <sys/poll.h>
+#include <sys/pollset.h>
+        ],[[
+pollset_t ps = pollset_create(-1);
+        ]])],
+        [$1], [$2]
+    )
+}])
+
 dnl ################################################################################
 dnl # LIBZMQ_CHECK_POLLER_EPOLL_RUN([action-if-found], [action-if-not-found])      #
 dnl # Checks epoll polling system can actually run #
@@ -892,7 +908,7 @@ AC_DEFUN([LIBZMQ_CHECK_POLLER], [{
     # Allow user to override poller autodetection
     AC_ARG_WITH([poller],
         [AS_HELP_STRING([--with-poller],
-        [choose polling system manually. Valid values are 'kqueue', 'epoll', 'devpoll', 'poll', 'select', or 'auto'. [default=auto]])])
+        [choose polling system manually. Valid values are 'kqueue', 'pollset', 'epoll', 'devpoll', 'poll', 'select', or 'auto'. [default=auto]])])
 
     if test "x$with_poller" == "x"; then
         pollers=auto
@@ -901,7 +917,7 @@ AC_DEFUN([LIBZMQ_CHECK_POLLER], [{
     fi
     if test "$pollers" == "auto"; then
         # We search for pollers in this order
-        pollers="kqueue epoll devpoll poll select"
+        pollers="kqueue pollset epoll devpoll poll select"
     fi
 
     # try to find suitable polling system. the order of testing is:
@@ -916,6 +932,13 @@ AC_DEFUN([LIBZMQ_CHECK_POLLER], [{
                     poller_found=1
                 ])
             ;;
+            pollset)
+                LIBZMQ_CHECK_POLLER_POLLSET([
+                    AC_MSG_NOTICE([Using 'pollset' polling system])
+                    AC_DEFINE(ZMQ_USE_POLLSET, 1, [Use 'pollset' polling system])
+                    poller_found=1
+                ])
+            ;;
             epoll)
                 LIBZMQ_CHECK_POLLER_EPOLL([
                     AC_MSG_NOTICE([Using 'epoll' polling system])