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# ===========================================================================
# http://autoconf-archive.cryp.to/etr_short_sleep.html
# ===========================================================================
#
# SYNOPSIS
#
# ETR_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.
AC_DEFUN([ETR_SHORT_SLEEP],
[
AC_MSG_CHECKING([for nap() in libc])
AC_TRY_LINK([ extern "C" long nap(long ms); ], [ nap(42); ],
[
etr_ss_found=yes
etr_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)
etr_ss_found=no
])
if test x"$etr_ss_found" = "xno"
then
AC_MSG_CHECKING([for usleep()])
AC_TRY_LINK([ #include <unistd.h> ], [ usleep(42); ],
[
etr_ss_found=yes
etr_ss_factor=1000
AC_DEFINE(HAVE_USLEEP,1,
[Define to use the usleep() system call for short sleeps])
AC_MSG_RESULT(yes)
],
[
AC_MSG_RESULT(no)
etr_ss_found=no
])
fi
if test x"$etr_ss_found" = "xno"
then
save_LIBS=$LIBS
LIBS="$LIBS -lx"
AC_MSG_CHECKING([for nap() in libx])
AC_TRY_LINK([ extern "C" long nap(long ms); ], [ nap(42); ],
[
etr_ss_found=yes
etr_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)
etr_ss_found=no
])
LIBS=$save_LIBS
ETR_SS_LIB=-lx
AC_SUBST(ETR_SS_LIB)
fi
if test x"$etr_ss_found" = "xyes"
then
AC_DEFINE_UNQUOTED(SHORT_SLEEP_FACTOR, $etr_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 ETR_SHORT_SLEEP
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