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AC_DEFUN([AX_ARG_IOLOOP_MECHANISM],[
desired_iopoll_mechanism="none"
dnl FIXME need to handle arguments a bit better (see ac_arg_disable_block_alloc)
AC_ARG_ENABLE([kqueue], [AS_HELP_STRING([--enable-kqueue], [Force kqueue usage.])], [desired_iopoll_mechanism="kqueue"])
AC_ARG_ENABLE([epoll], [AS_HELP_STRING([--enable-epoll], [Force epoll usage.])], [desired_iopoll_mechanism="epoll"])
AC_ARG_ENABLE([devpoll],[AS_HELP_STRING([--enable-devpoll],[Force devpoll usage.])],[desired_iopoll_mechanism="devpoll"])
AC_ARG_ENABLE([poll], [AS_HELP_STRING([--enable-poll], [Force poll usage.])], [desired_iopoll_mechanism="poll"])
AC_MSG_CHECKING([for optimal/desired iopoll mechanism])
iopoll_mechanism_none=0
AC_DEFINE_UNQUOTED([__IOPOLL_MECHANISM_NONE],[$iopoll_mechanism_none],[no iopoll mechanism])
iopoll_mechanism_kqueue=1
AC_DEFINE_UNQUOTED([__IOPOLL_MECHANISM_KQUEUE],[$iopoll_mechanism_kqueue],[kqueue mechanism])
AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([kevent])],[is_kqueue_mechanism_available="yes"],[is_kqueue_mechanism_available="no"])
iopoll_mechanism_epoll=2
AC_DEFINE_UNQUOTED([__IOPOLL_MECHANISM_EPOLL],[$iopoll_mechanism_epoll],[epoll mechanism])
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <sys/epoll.h>], [epoll_create(256);])], [is_epoll_mechanism_available="yes"],[is_epoll_mechanism_available="no"])
iopoll_mechanism_devpoll=3
AC_DEFINE_UNQUOTED([__IOPOLL_MECHANISM_DEVPOLL],[$iopoll_mechanism_devpoll],[devpoll mechanism])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <devpoll.h>])],[is_devpoll_mechanism_available="yes"],[is_devpoll_mechanism_available="no"])
if test "$is_devpoll_mechanism_available" = "yes" ; then
AC_DEFINE([HAVE_DEVPOLL_H],[1],[Define to 1 if you have the <devpoll.h> header file.])
fi
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/devpoll.h>])],[is_devpoll_mechanism_available="yes"],[is_devpoll_mechanism_available="no"])
if test "$is_devpoll_mechanism_available" = "yes" ; then
AC_DEFINE([HAVE_SYS_DEVPOLL_H],[1],[Define to 1 if you have the <sys/devpoll.h> header file.])
fi
iopoll_mechanism_poll=4
AC_DEFINE_UNQUOTED([__IOPOLL_MECHANISM_POLL],[$iopoll_mechanism_poll],[poll mechanism])
AC_LINK_IFELSE([AC_LANG_FUNC_LINK_TRY([poll])],[is_poll_mechanism_available="yes"],[is_poll_mechanism_available="no"])
optimal_iopoll_mechanism="none"
for mechanism in "kqueue" "epoll" "devpoll" "poll" ; do # order is important
eval "is_optimal_iopoll_mechanism_available=\$is_${mechanism}_mechanism_available"
if test "$is_optimal_iopoll_mechanism_available" = "yes" ; then
optimal_iopoll_mechanism="$mechanism"
break
fi
done
if test "$desired_iopoll_mechanism" = "none" ; then
if test "$optimal_iopoll_mechanism" = "none" ; then
AC_MSG_RESULT([none])
AC_MSG_ERROR([no iopoll mechanism found!])
else
selected_iopoll_mechanism=$optimal_iopoll_mechanism
AC_MSG_RESULT([$selected_iopoll_mechanism])
fi
else
eval "is_desired_iopoll_mechanism_available=\$is_${desired_iopoll_mechanism}_mechanism_available"
if test "$is_desired_iopoll_mechanism_available" = "yes" ; then
selected_iopoll_mechanism=$desired_iopoll_mechanism
AC_MSG_RESULT([$selected_iopoll_mechanism])
else
AC_MSG_RESULT([none])
AC_MSG_ERROR([desired iopoll mechanism, $desired_iopoll_mechanism, is not available])
fi
fi
eval "use_iopoll_mechanism=\$iopoll_mechanism_${selected_iopoll_mechanism}"
AC_DEFINE_UNQUOTED([USE_IOPOLL_MECHANISM],[$use_iopoll_mechanism],[use this iopoll mechanism])
])
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