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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_short_sleep.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_SHORT_SLEEP
#
# DESCRIPTION
#
# This macro searches for a "sleep" function that has 1/1000 of a second
# accuracy. On some systems, this is known as nap() and on others usleep()
# / 1000. There are probably other functions like this defined in other
# system libraries, but we don't know how to search for them yet.
# Contributions joyously accepted. :)
#
# LICENSE
#
# Copyright (c) 2008 Warren Young <warren@etr-usa.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([ETR_SHORT_SLEEP], [AX_SHORT_SLEEP])
AC_DEFUN([AX_SHORT_SLEEP],
[
AC_MSG_CHECKING([for nap() in libc])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern "C" long nap(long ms);]], [[nap(42);]])], [
ax_ss_found=yes
ax_ss_factor=1
AC_DEFINE(HAVE_NAP,1,
[Define to use the nap() system call for short sleeps])
AC_MSG_RESULT(yes)
],[
AC_MSG_RESULT(no)
ax_ss_found=no
])
if test x"$ax_ss_found" = "xno"
then
AC_MSG_CHECKING([for usleep()])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>]], [[usleep(42);]])],[
ax_ss_found=yes
ax_ss_factor=1000
AC_DEFINE(HAVE_USLEEP,1,
[Define to use the usleep() system call for short sleeps])
AC_MSG_RESULT(yes)
],[
AC_MSG_RESULT(no)
ax_ss_found=no
])
fi
if test x"$ax_ss_found" = "xno"
then
save_LIBS=$LIBS
LIBS="$LIBS -lx"
AC_MSG_CHECKING([for nap() in libx])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern "C" long nap(long ms);]], [[nap(42);]])],[
ax_ss_found=yes
ax_ss_factor=1
AC_DEFINE(HAVE_NAP,1,
[Define to use the nap() system call for short sleeps])
AC_MSG_RESULT(yes)
],[
AC_MSG_RESULT(no)
ax_ss_found=no
])
LIBS=$save_LIBS
AX_SS_LIB=-lx
AC_SUBST(AX_SS_LIB)
fi
if test x"$ax_ss_found" = "xyes"
then
AC_DEFINE_UNQUOTED(SHORT_SLEEP_FACTOR, $ax_ss_factor,
[Multiply milliseconds by this to get the argument for the short sleep system call])
else
AC_MSG_ERROR([Could not find a "short sleep" system call.])
fi
])dnl AX_SHORT_SLEEP
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