# Check for Omnithread (pthread/NT) thread support.             -*- Autoconf -*-

# Copyright 2003,2007 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3, or (at your option)

# any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Boston, MA

# 02110-1301, USA.

AC_DEFUN([GR_OMNITHREAD],

[

  # Check first for POSIX

  ACX_PTHREAD(

  [ AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.])

    ot_posix="yes"

    DEFINES="$DEFINES -DOMNITHREAD_POSIX=1"

  ],[

    # If no POSIX support found, then check for NT threads

    AC_MSG_CHECKING([for NT threads])

    AC_LINK_IFELSE([

        #include <windows.h>

        #include <winbase.h>

        int main() { InitializeCriticalSection(NULL); return 0; }

      ],

      [ 

        ot_nt="yes"

        DEFINES="$DEFINES -DOMNITHREAD_NT=1"

      ],

      [AC_MSG_FAILURE([GNU Radio requires POSIX threads.  pthreads not found.])]

    )

    AC_MSG_RESULT(yes)

  ])

  AM_CONDITIONAL(OMNITHREAD_POSIX, test "x$ot_posix" = xyes)

  AM_CONDITIONAL(OMNITHREAD_NT, test "x$ot_nt" = xyes)

  save_LIBS="$LIBS"

  AC_SEARCH_LIBS([clock_gettime], [rt], [PTHREAD_LIBS="$PTHREAD_LIBS $LIBS"])

  AC_CHECK_FUNCS([clock_gettime gettimeofday nanosleep])

  LIBS="$save_LIBS"

])