Changeset 10196

03/02/11 10:07:03 (11 years ago)
Added ACX_PTHREAD macro
1 edited


  • trunk/FACT++/aclocal.m4

    r10193 r10196  
    1919If you have problems, you may need to regenerate the build system entirely.
    2020To do so, use the procedure documented by the package, typically `autoreconf'.])])
     22# ===========================================================================
     24# ===========================================================================
     26# SYNOPSIS
     32#   This macro figures out how to build C programs using POSIX threads. It
     33#   sets the PTHREAD_LIBS output variable to the threads library and linker
     34#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
     35#   flags that are needed. (The user can also force certain compiler
     36#   flags/libs to be tested by setting these environment variables.)
     38#   Also sets PTHREAD_CC to any special C compiler that is needed for
     39#   multi-threaded programs (defaults to the value of CC otherwise). (This
     40#   is necessary on AIX to use the special cc_r compiler alias.)
     42#   NOTE: You are assumed to not only compile your program with these flags,
     43#   but also link it with them as well. e.g. you should link with
     46#   If you are only building threads programs, you may wish to use these
     47#   variables in your default LIBS, CFLAGS, and CC:
     49#          LIBS="$PTHREAD_LIBS $LIBS"
     50#          CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
     51#          CC="$PTHREAD_CC"
     53#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
     54#   has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
     57#   ACTION-IF-FOUND is a list of shell commands to run if a threads library
     58#   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
     59#   is not found. If ACTION-IF-FOUND is not specified, the default action
     60#   will define HAVE_PTHREAD.
     62#   Please let the authors know if this macro fails on any platform, or if
     63#   you have any other suggestions or comments. This macro was based on work
     64#   by SGJ on autoconf scripts for FFTW ( (with help
     65#   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
     66#   Alejandro Forero Cuervo to the autoconf macro repository. We are also
     67#   grateful for the helpful feedback of numerous users.
     69# LICENSE
     71#   Copyright (c) 2008 Steven G. Johnson <>
     73#   This program is free software: you can redistribute it and/or modify it
     74#   under the terms of the GNU General Public License as published by the
     75#   Free Software Foundation, either version 3 of the License, or (at your
     76#   option) any later version.
     78#   This program is distributed in the hope that it will be useful, but
     79#   WITHOUT ANY WARRANTY; without even the implied warranty of
     81#   Public License for more details.
     83#   You should have received a copy of the GNU General Public License along
     84#   with this program. If not, see <>.
     86#   As a special exception, the respective Autoconf Macro's copyright owner
     87#   gives unlimited permission to copy, distribute and modify the configure
     88#   scripts that are the output of Autoconf when processing the Macro. You
     89#   need not follow the terms of the GNU General Public License when using
     90#   or distributing such scripts, even though portions of the text of the
     91#   Macro appear in them. The GNU General Public License (GPL) does govern
     92#   all other use of the material that constitutes the Autoconf Macro.
     94#   This special exception to the GPL applies to versions of the Autoconf
     95#   Macro released by the Autoconf Archive. When you make and distribute a
     96#   modified version of the Autoconf Macro, you may extend this special
     97#   exception to the GPL to apply to your modified version as well.
     105# We used to check for pthread.h first, but this fails if pthread.h
     106# requires special compiler flags (e.g. on True64 or Sequent).
     107# It gets checked for in the link test anyway.
     109# First of all, check if the user has set any of the PTHREAD_LIBS,
     110# etcetera environment variables, and if threads linking works using
     111# them:
     112if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
     113        save_CFLAGS="$CFLAGS"
     115        save_LIBS="$LIBS"
     116        LIBS="$PTHREAD_LIBS $LIBS"
     117        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
     118        AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
     119        AC_MSG_RESULT($acx_pthread_ok)
     120        if test x"$acx_pthread_ok" = xno; then
     121                PTHREAD_LIBS=""
     122                PTHREAD_CFLAGS=""
     123        fi
     124        LIBS="$save_LIBS"
     125        CFLAGS="$save_CFLAGS"
     128# We must check for the threads library under a number of different
     129# names; the ordering is very important because some systems
     130# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
     131# libraries is broken (non-POSIX).
     133# Create a list of thread flags to try.  Items starting with a "-" are
     134# C compiler flags, and other items are library names, except for "none"
     135# which indicates that we try without any flags at all, and "pthread-config"
     136# which is a program returning the flags for the Pth emulation library.
     138acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
     140# The ordering *is* (sometimes) important.  Some notes on the
     141# individual items follow:
     143# pthreads: AIX (must check this before -lpthread)
     144# none: in case threads are in libc; should be tried before -Kthread and
     145#       other compiler flags to prevent continual compiler warnings
     146# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
     147# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
     148# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
     149# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
     150# -pthreads: Solaris/gcc
     151# -mthreads: Mingw32/gcc, Lynx/gcc
     152# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
     153#      doesn't hurt to check since this sometimes defines pthreads too;
     154#      also defines -D_REENTRANT)
     155#      ... -mt is also the pthreads flag for HP/aCC
     156# pthread: Linux, etcetera
     157# --thread-safe: KAI C++
     158# pthread-config: use pthread-config program (for GNU Pth library)
     160case "${host_cpu}-${host_os}" in
     161        *solaris*)
     163        # On Solaris (at least, for some versions), libc contains stubbed
     164        # (non-functional) versions of the pthreads routines, so link-based
     165        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
     166        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
     167        # a function called by this macro, so we could check for that, but
     168        # who knows whether they'll stub that too in a future libc.)  So,
     169        # we'll just look for -pthreads and -lpthread first:
     171        acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags"
     172        ;;
     175if test x"$acx_pthread_ok" = xno; then
     176for flag in $acx_pthread_flags; do
     178        case $flag in
     179                none)
     180                AC_MSG_CHECKING([whether pthreads work without any flags])
     181                ;;
     183                -*)
     184                AC_MSG_CHECKING([whether pthreads work with $flag])
     185                PTHREAD_CFLAGS="$flag"
     186                ;;
     188                pthread-config)
     189                AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
     190                if test x"$acx_pthread_config" = xno; then continue; fi
     191                PTHREAD_CFLAGS="`pthread-config --cflags`"
     192                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
     193                ;;
     195                *)
     196                AC_MSG_CHECKING([for the pthreads library -l$flag])
     197                PTHREAD_LIBS="-l$flag"
     198                ;;
     199        esac
     201        save_LIBS="$LIBS"
     202        save_CFLAGS="$CFLAGS"
     203        LIBS="$PTHREAD_LIBS $LIBS"
     206        # Check for various functions.  We must include pthread.h,
     207        # since some functions may be macros.  (On the Sequent, we
     208        # need a special flag -Kthread to make this header compile.)
     209        # We check for pthread_join because it is in -lpthread on IRIX
     210        # while pthread_create is in libc.  We check for pthread_attr_init
     211        # due to DEC craziness with -lpthreads.  We check for
     212        # pthread_cleanup_push because it is one of the few pthread
     213        # functions on Solaris that doesn't have a non-functional libc stub.
     214        # We try pthread_create on general principles.
     215        AC_TRY_LINK([#include <pthread.h>],
     216                    [pthread_t th; pthread_join(th, 0);
     217                     pthread_attr_init(0); pthread_cleanup_push(0, 0);
     218                     pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
     219                    [acx_pthread_ok=yes])
     221        LIBS="$save_LIBS"
     222        CFLAGS="$save_CFLAGS"
     224        AC_MSG_RESULT($acx_pthread_ok)
     225        if test "x$acx_pthread_ok" = xyes; then
     226                break;
     227        fi
     229        PTHREAD_LIBS=""
     230        PTHREAD_CFLAGS=""
     234# Various other checks:
     235if test "x$acx_pthread_ok" = xyes; then
     236        save_LIBS="$LIBS"
     237        LIBS="$PTHREAD_LIBS $LIBS"
     238        save_CFLAGS="$CFLAGS"
     241        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
     242        AC_MSG_CHECKING([for joinable pthread attribute])
     243        attr_name=unknown
     245            AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;],
     246                        [attr_name=$attr; break])
     247        done
     248        AC_MSG_RESULT($attr_name)
     249        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
     250            AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
     251                               [Define to necessary symbol if this constant
     252                                uses a non-standard name on your system.])
     253        fi
     255        AC_MSG_CHECKING([if more special flags are required for pthreads])
     256        flag=no
     257        case "${host_cpu}-${host_os}" in
     258            *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
     259            *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
     260        esac
     261        AC_MSG_RESULT(${flag})
     262        if test "x$flag" != xno; then
     263            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
     264        fi
     266        LIBS="$save_LIBS"
     267        CFLAGS="$save_CFLAGS"
     269        # More AIX lossage: must compile with xlc_r or cc_r
     270        if test x"$GCC" != xyes; then
     271          AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC})
     272        else
     273          PTHREAD_CC=$CC
     274        fi
     276        PTHREAD_CC="$CC"
     283# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
     284if test x"$acx_pthread_ok" = xyes; then
     285        ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
     286        :
     288        acx_pthread_ok=no
     289        $2
     292])dnl ACX_PTHREAD
    22294# ===========================================================================
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