#

# Begin pthreads checking.

#

# First, decide whether to use multithreading or not.

#

# Enable multithreading by default on systems where it is known

# to work well, and where debugging of multithreaded programs

# is supported.

#

AC_MSG_CHECKING(whether to build with thread support)

case $host in

*-dec-osf*)

	use_threads=true ;;

[*-solaris2.[0-6]])

	# Thread signals are broken on Solaris 2.6; they are sometimes

	# delivered to the wrong thread.

	use_threads=false ;;

*-solaris*)

	use_threads=true ;;

*-ibm-aix*)

	use_threads=true ;;

*-hp-hpux10*)

	use_threads=false ;;

*-hp-hpux11*)

	use_threads=true ;;

*-sgi-irix*)

	use_threads=true ;;

*-sco-sysv*uw*|*-*-sysv*UnixWare*)

        # UnixWare

	use_threads=false ;;

*-*-sysv*OpenUNIX*)

        # UnixWare

	use_threads=true ;;

[*-netbsd[1234].*])

	# NetBSD earlier than NetBSD 5.0 has poor pthreads.

	#  Don't use it by default.

	use_threads=false ;;

*-netbsd*)

	use_threads=true ;;

[*-openbsd[12345].*]|[*-openbsd6.[01]])

	# OpenBSD users reported that named dumps core on

	# startup when built with threads.

	use_threads=false ;;

*-openbsd*)

	use_threads=true ;;

[*-freebsd[1234567].*])

	# Threads are broken at least up to FreeBSD 4.11.

	# FreeBSD 5, 6 and 7 we have never officially supported threads

	# on. YMMV

	use_threads=false ;;

*-freebsd*)

	use_threads=true ;;

[*-bsdi[234]*])

	# Thread signals do not work reliably on some versions of BSD/OS.

	use_threads=false ;;

*-bsdi5*)

	use_threads=true ;;

*-linux*)

	use_threads=true ;;	

*-darwin[[123456789]].*)

	use_threads=false ;;

*-darwin*.*)

	use_threads=true ;;

*)

	use_threads=true ;;

esac

AC_ARG_ENABLE(threads,

	[  --enable-threads        enable multithreading])

case "$enable_threads" in

	yes)

		use_threads=true

		;;

	no)

		use_threads=false

		;;

	'')

		# Use system-dependent default

		;;

	*)

	    	AC_MSG_ERROR([--enable-threads takes yes or no])

		;;

esac

if $use_threads

then

	AC_MSG_RESULT(yes)

else

	AC_MSG_RESULT(no)	

fi

if $use_threads

then

	#

	# Search for / configure pthreads in a system-dependent fashion.

	#

	case "$host" in

		*-freebsd*)

			# We don't want to set -lpthread as that break

			# the ability to choose threads library at final

			# link time and is not valid for all architectures.

			PTHREAD=

			if test "X$GCC" = "Xyes"; then

				saved_cc="$CC"

				CC="$CC -pthread"

				AC_MSG_CHECKING(for gcc -pthread support);

				AC_TRY_LINK([#include <pthread.h>],

					    [printf("%x\n", pthread_create);],

					    PTHREAD="yes"

					    AC_MSG_RESULT(yes),

					    AC_MSG_RESULT(no))

				CC="$saved_cc"

			fi

			if test "X$PTHREAD" != "Xyes"; then

				AC_CHECK_LIB(pthread, pthread_create,,

				AC_CHECK_LIB(thr, thread_create,,

				AC_CHECK_LIB(c_r, pthread_create,,

				AC_CHECK_LIB(c, pthread_create,,

				AC_MSG_ERROR("could not find thread libraries")))))

			fi

			;;

		*)

			AC_CHECK_LIB(pthread, pthread_create,,

				AC_CHECK_LIB(pthread, __pthread_create,,

				AC_CHECK_LIB(pthread, __pthread_create_system,,

				AC_CHECK_LIB(c_r, pthread_create,,

				AC_CHECK_LIB(c, pthread_create,,

				AC_MSG_ERROR("could not find thread libraries"))))))

		;;

	esac

fi