#
# $Id: pthread.subr,v 1.13 2004/03/30 12:44:16 jmmv Exp $
# bt_config module: pthread detection
#
# buildtool
# Copyright (c) 2002, 2003, 2004 Julio M. Merino Vidal
#
# This code was originally contributed by Juan J. Martínez.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name of the author nor the names of contributors may
#    be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

pthread_feature() {
    bt_feature PTHREAD auto \
        "Whether threading support is wanted or not (yes, no, auto)."
}

bt_define_ml_check pthread_check

pthread_check_c() { pthreadown_check c; }
pthread_check_cxx() { pthreadown_check cxx; }

pthreadown_check() {
    local lang="$1"
    local flags="pthreads pthread lthread none -Kthread -kthread \
                 -pthread -pthreads -mthreads --thread-safe -mt"
    local flag res saved_flags_ld saved_libs

    if [ ${BT_FEATURE_PTHREAD:-auto} = no ]; then
        echo "pthread support disabled as requested"
        bt_msg_summary 'Threading support: no'
        return 0
    fi

    for flag in ${flags}; do
        PTHREAD_LIBS=
        PTHREAD_FLAGS_LD=

        case ${flag} in
            none)
                bt_msg_chk "pthread without flags"
                ;;

            -*)
                bt_msg_chk "pthread with ${flag}"
                PTHREAD_FLAGS_LD=${flag}
                ;;

            *)
                bt_msg_chk "pthread library -l${flag}"
                PTHREAD_LIBS="-l${flag}"
                ;;
        esac

        saved_flags_ld=${BT_FLAGS_LD}
        saved_libs=${BT_LIBS}
        BT_FLAGS_LD+=${PTHREAD_FLAGS_LD}
        BT_LIBS+=${PTHREAD_LIBS}
        bt_try_compile_${lang} <<EOF
#include <pthread.h>
void *start_routine(void *unused) {}
int main() {
pthread_t th;
pthread_create(&th, 0, start_routine, 0);
pthread_join(th, 0);
return 0; }
EOF
        res=$?
        BT_FLAGS_LD=${saved_flags_ld}
        BT_LIBS=${saved_libs}
        if [ ${res} -eq 0 ]; then
            bt_subst PTHREAD_FLAGS_LD
            bt_subst PTHREAD_LIBS
            bt_msg_result yes
            if [ ${BT_FEATURE_PTHREAD:-unset} != unset ]; then
                bt_msg_summary 'Threading support: yes'
            fi
            return 0
        else
            bt_msg_result no
        fi
    done

    if [ ${BT_FEATURE_PTHREAD:-unset} = yes ]; then
        bt_err "threading support not found." \
               "Disable it manually with --disable-pthread."
    elif [ ${BT_FEATURE_PTHREAD:-unset} != unset ]; then
        bt_msg_summary 'Threading support: no'
    fi

    return 1
}

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