1266075Sdes# =========================================================================== 2266075Sdes# http://www.gnu.org/software/autoconf-archive/ax_pthread.html 3266075Sdes# =========================================================================== 4266075Sdes# 5266075Sdes# SYNOPSIS 6266075Sdes# 7266075Sdes# AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) 8266075Sdes# 9266075Sdes# DESCRIPTION 10266075Sdes# 11266075Sdes# This macro figures out how to build C programs using POSIX threads. It 12266075Sdes# sets the PTHREAD_LIBS output variable to the threads library and linker 13266075Sdes# flags, and the PTHREAD_CFLAGS output variable to any special C compiler 14266075Sdes# flags that are needed. (The user can also force certain compiler 15266075Sdes# flags/libs to be tested by setting these environment variables.) 16266075Sdes# 17266075Sdes# Also sets PTHREAD_CC to any special C compiler that is needed for 18266075Sdes# multi-threaded programs (defaults to the value of CC otherwise). (This 19266075Sdes# is necessary on AIX to use the special cc_r compiler alias.) 20266075Sdes# 21266075Sdes# NOTE: You are assumed to not only compile your program with these flags, 22266075Sdes# but also link it with them as well. e.g. you should link with 23266075Sdes# $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS 24266075Sdes# 25266075Sdes# If you are only building threads programs, you may wish to use these 26266075Sdes# variables in your default LIBS, CFLAGS, and CC: 27266075Sdes# 28266075Sdes# LIBS="$PTHREAD_LIBS $LIBS" 29266075Sdes# CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 30266075Sdes# CC="$PTHREAD_CC" 31266075Sdes# 32266075Sdes# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant 33266075Sdes# has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name 34266075Sdes# (e.g. PTHREAD_CREATE_UNDETACHED on AIX). 35266075Sdes# 36266075Sdes# Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the 37266075Sdes# PTHREAD_PRIO_INHERIT symbol is defined when compiling with 38266075Sdes# PTHREAD_CFLAGS. 39266075Sdes# 40266075Sdes# ACTION-IF-FOUND is a list of shell commands to run if a threads library 41266075Sdes# is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it 42266075Sdes# is not found. If ACTION-IF-FOUND is not specified, the default action 43266075Sdes# will define HAVE_PTHREAD. 44266075Sdes# 45266075Sdes# Please let the authors know if this macro fails on any platform, or if 46266075Sdes# you have any other suggestions or comments. This macro was based on work 47266075Sdes# by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help 48266075Sdes# from M. Frigo), as well as ac_pthread and hb_pthread macros posted by 49266075Sdes# Alejandro Forero Cuervo to the autoconf macro repository. We are also 50266075Sdes# grateful for the helpful feedback of numerous users. 51266075Sdes# 52266075Sdes# Updated for Autoconf 2.68 by Daniel Richard G. 53266075Sdes# 54266075Sdes# LICENSE 55266075Sdes# 56266075Sdes# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> 57266075Sdes# Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG> 58266075Sdes# 59266075Sdes# This program is free software: you can redistribute it and/or modify it 60266075Sdes# under the terms of the GNU General Public License as published by the 61266075Sdes# Free Software Foundation, either version 3 of the License, or (at your 62266075Sdes# option) any later version. 63266075Sdes# 64266075Sdes# This program is distributed in the hope that it will be useful, but 65266075Sdes# WITHOUT ANY WARRANTY; without even the implied warranty of 66266075Sdes# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 67266075Sdes# Public License for more details. 68266075Sdes# 69266075Sdes# You should have received a copy of the GNU General Public License along 70266075Sdes# with this program. If not, see <http://www.gnu.org/licenses/>. 71266075Sdes# 72266075Sdes# As a special exception, the respective Autoconf Macro's copyright owner 73266075Sdes# gives unlimited permission to copy, distribute and modify the configure 74266075Sdes# scripts that are the output of Autoconf when processing the Macro. You 75266075Sdes# need not follow the terms of the GNU General Public License when using 76266075Sdes# or distributing such scripts, even though portions of the text of the 77266075Sdes# Macro appear in them. The GNU General Public License (GPL) does govern 78266075Sdes# all other use of the material that constitutes the Autoconf Macro. 79266075Sdes# 80266075Sdes# This special exception to the GPL applies to versions of the Autoconf 81266075Sdes# Macro released by the Autoconf Archive. When you make and distribute a 82266075Sdes# modified version of the Autoconf Macro, you may extend this special 83266075Sdes# exception to the GPL to apply to your modified version as well. 84266075Sdes 85266075Sdes#serial 20 86266075Sdes 87266075SdesAU_ALIAS([ACX_PTHREAD], [AX_PTHREAD]) 88266075SdesAC_DEFUN([AX_PTHREAD], [ 89266075SdesAC_REQUIRE([AC_CANONICAL_HOST]) 90266075SdesAC_LANG_PUSH([C]) 91266075Sdesax_pthread_ok=no 92266075Sdes 93266075Sdes# We used to check for pthread.h first, but this fails if pthread.h 94266075Sdes# requires special compiler flags (e.g. on True64 or Sequent). 95266075Sdes# It gets checked for in the link test anyway. 96266075Sdes 97266075Sdes# First of all, check if the user has set any of the PTHREAD_LIBS, 98266075Sdes# etcetera environment variables, and if threads linking works using 99266075Sdes# them: 100266075Sdesif test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then 101266075Sdes save_CFLAGS="$CFLAGS" 102266075Sdes CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 103266075Sdes save_LIBS="$LIBS" 104266075Sdes LIBS="$PTHREAD_LIBS $LIBS" 105266075Sdes AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) 106266075Sdes AC_TRY_LINK_FUNC(pthread_join, ax_pthread_ok=yes) 107266075Sdes AC_MSG_RESULT($ax_pthread_ok) 108266075Sdes if test x"$ax_pthread_ok" = xno; then 109266075Sdes PTHREAD_LIBS="" 110266075Sdes PTHREAD_CFLAGS="" 111266075Sdes fi 112266075Sdes LIBS="$save_LIBS" 113266075Sdes CFLAGS="$save_CFLAGS" 114266075Sdesfi 115266075Sdes 116266075Sdes# We must check for the threads library under a number of different 117266075Sdes# names; the ordering is very important because some systems 118266075Sdes# (e.g. DEC) have both -lpthread and -lpthreads, where one of the 119266075Sdes# libraries is broken (non-POSIX). 120266075Sdes 121266075Sdes# Create a list of thread flags to try. Items starting with a "-" are 122266075Sdes# C compiler flags, and other items are library names, except for "none" 123266075Sdes# which indicates that we try without any flags at all, and "pthread-config" 124266075Sdes# which is a program returning the flags for the Pth emulation library. 125266075Sdes 126266075Sdesax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" 127266075Sdes 128266075Sdes# The ordering *is* (sometimes) important. Some notes on the 129266075Sdes# individual items follow: 130266075Sdes 131266075Sdes# pthreads: AIX (must check this before -lpthread) 132266075Sdes# none: in case threads are in libc; should be tried before -Kthread and 133266075Sdes# other compiler flags to prevent continual compiler warnings 134266075Sdes# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) 135266075Sdes# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) 136266075Sdes# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) 137266075Sdes# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) 138266075Sdes# -pthreads: Solaris/gcc 139266075Sdes# -mthreads: Mingw32/gcc, Lynx/gcc 140266075Sdes# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it 141266075Sdes# doesn't hurt to check since this sometimes defines pthreads too; 142266075Sdes# also defines -D_REENTRANT) 143266075Sdes# ... -mt is also the pthreads flag for HP/aCC 144266075Sdes# pthread: Linux, etcetera 145266075Sdes# --thread-safe: KAI C++ 146266075Sdes# pthread-config: use pthread-config program (for GNU Pth library) 147266075Sdes 148266075Sdescase ${host_os} in 149266075Sdes solaris*) 150266075Sdes 151266075Sdes # On Solaris (at least, for some versions), libc contains stubbed 152266075Sdes # (non-functional) versions of the pthreads routines, so link-based 153266075Sdes # tests will erroneously succeed. (We need to link with -pthreads/-mt/ 154266075Sdes # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather 155266075Sdes # a function called by this macro, so we could check for that, but 156266075Sdes # who knows whether they'll stub that too in a future libc.) So, 157266075Sdes # we'll just look for -pthreads and -lpthread first: 158266075Sdes 159266075Sdes ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags" 160266075Sdes ;; 161266075Sdes 162266075Sdes darwin*) 163266075Sdes ax_pthread_flags="-pthread $ax_pthread_flags" 164266075Sdes ;; 165266075Sdesesac 166266075Sdes 167266075Sdesif test x"$ax_pthread_ok" = xno; then 168266075Sdesfor flag in $ax_pthread_flags; do 169266075Sdes 170266075Sdes case $flag in 171266075Sdes none) 172266075Sdes AC_MSG_CHECKING([whether pthreads work without any flags]) 173266075Sdes ;; 174266075Sdes 175266075Sdes -*) 176266075Sdes AC_MSG_CHECKING([whether pthreads work with $flag]) 177266075Sdes PTHREAD_CFLAGS="$flag" 178266075Sdes ;; 179266075Sdes 180266075Sdes pthread-config) 181266075Sdes AC_CHECK_PROG(ax_pthread_config, pthread-config, yes, no) 182266075Sdes if test x"$ax_pthread_config" = xno; then continue; fi 183266075Sdes PTHREAD_CFLAGS="`pthread-config --cflags`" 184266075Sdes PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" 185266075Sdes ;; 186266075Sdes 187266075Sdes *) 188266075Sdes AC_MSG_CHECKING([for the pthreads library -l$flag]) 189266075Sdes PTHREAD_LIBS="-l$flag" 190266075Sdes ;; 191266075Sdes esac 192266075Sdes 193266075Sdes save_LIBS="$LIBS" 194266075Sdes save_CFLAGS="$CFLAGS" 195266075Sdes LIBS="$PTHREAD_LIBS $LIBS" 196266075Sdes CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 197266075Sdes 198266075Sdes # Check for various functions. We must include pthread.h, 199266075Sdes # since some functions may be macros. (On the Sequent, we 200266075Sdes # need a special flag -Kthread to make this header compile.) 201266075Sdes # We check for pthread_join because it is in -lpthread on IRIX 202266075Sdes # while pthread_create is in libc. We check for pthread_attr_init 203266075Sdes # due to DEC craziness with -lpthreads. We check for 204266075Sdes # pthread_cleanup_push because it is one of the few pthread 205266075Sdes # functions on Solaris that doesn't have a non-functional libc stub. 206266075Sdes # We try pthread_create on general principles. 207266075Sdes AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h> 208266075Sdes static void routine(void *a) { *((int*)a) = 0; } 209266075Sdes static void *start_routine(void *a) { return a; }], 210266075Sdes [pthread_t th; pthread_attr_t attr; 211266075Sdes pthread_create(&th, 0, start_routine, 0); 212266075Sdes pthread_join(th, 0); 213266075Sdes pthread_attr_init(&attr); 214266075Sdes pthread_cleanup_push(routine, 0); 215266075Sdes pthread_cleanup_pop(0) /* ; */])], 216266075Sdes [ax_pthread_ok=yes], 217266075Sdes []) 218266075Sdes 219266075Sdes LIBS="$save_LIBS" 220266075Sdes CFLAGS="$save_CFLAGS" 221266075Sdes 222266075Sdes AC_MSG_RESULT($ax_pthread_ok) 223266075Sdes if test "x$ax_pthread_ok" = xyes; then 224266075Sdes break; 225266075Sdes fi 226266075Sdes 227266075Sdes PTHREAD_LIBS="" 228266075Sdes PTHREAD_CFLAGS="" 229266075Sdesdone 230266075Sdesfi 231266075Sdes 232266075Sdes# Various other checks: 233266075Sdesif test "x$ax_pthread_ok" = xyes; then 234266075Sdes save_LIBS="$LIBS" 235266075Sdes LIBS="$PTHREAD_LIBS $LIBS" 236266075Sdes save_CFLAGS="$CFLAGS" 237266075Sdes CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 238266075Sdes 239266075Sdes # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. 240266075Sdes AC_MSG_CHECKING([for joinable pthread attribute]) 241266075Sdes attr_name=unknown 242266075Sdes for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do 243266075Sdes AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>], 244266075Sdes [int attr = $attr; return attr /* ; */])], 245266075Sdes [attr_name=$attr; break], 246266075Sdes []) 247266075Sdes done 248266075Sdes AC_MSG_RESULT($attr_name) 249266075Sdes if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then 250266075Sdes AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, 251266075Sdes [Define to necessary symbol if this constant 252266075Sdes uses a non-standard name on your system.]) 253266075Sdes fi 254266075Sdes 255266075Sdes AC_MSG_CHECKING([if more special flags are required for pthreads]) 256266075Sdes flag=no 257266075Sdes case ${host_os} in 258266075Sdes aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";; 259266075Sdes osf* | hpux*) flag="-D_REENTRANT";; 260266075Sdes solaris*) 261266075Sdes if test "$GCC" = "yes"; then 262266075Sdes flag="-D_REENTRANT" 263266075Sdes else 264266075Sdes flag="-mt -D_REENTRANT" 265266075Sdes fi 266266075Sdes ;; 267266075Sdes esac 268266075Sdes AC_MSG_RESULT(${flag}) 269266075Sdes if test "x$flag" != xno; then 270266075Sdes PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" 271266075Sdes fi 272266075Sdes 273266075Sdes AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT], 274266075Sdes ax_cv_PTHREAD_PRIO_INHERIT, [ 275266075Sdes AC_LINK_IFELSE([ 276266075Sdes AC_LANG_PROGRAM([[#include <pthread.h>]], [[int i = PTHREAD_PRIO_INHERIT;]])], 277266075Sdes [ax_cv_PTHREAD_PRIO_INHERIT=yes], 278266075Sdes [ax_cv_PTHREAD_PRIO_INHERIT=no]) 279266075Sdes ]) 280266075Sdes AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"], 281266075Sdes AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], 1, [Have PTHREAD_PRIO_INHERIT.])) 282266075Sdes 283266075Sdes LIBS="$save_LIBS" 284266075Sdes CFLAGS="$save_CFLAGS" 285266075Sdes 286266075Sdes # More AIX lossage: compile with *_r variant 287266075Sdes if test "x$GCC" != xyes; then 288266075Sdes case $host_os in 289266075Sdes aix*) 290266075Sdes AS_CASE(["x/$CC"], 291266075Sdes [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6], 292266075Sdes [#handle absolute path differently from PATH based program lookup 293266075Sdes AS_CASE(["x$CC"], 294266075Sdes [x/*], 295266075Sdes [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])], 296266075Sdes [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])]) 297266075Sdes ;; 298266075Sdes esac 299266075Sdes fi 300266075Sdesfi 301266075Sdes 302266075Sdestest -n "$PTHREAD_CC" || PTHREAD_CC="$CC" 303266075Sdes 304266075SdesAC_SUBST(PTHREAD_LIBS) 305266075SdesAC_SUBST(PTHREAD_CFLAGS) 306266075SdesAC_SUBST(PTHREAD_CC) 307266075Sdes 308266075Sdes# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: 309266075Sdesif test x"$ax_pthread_ok" = xyes; then 310266075Sdes ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) 311266075Sdes : 312266075Sdeselse 313266075Sdes ax_pthread_ok=no 314266075Sdes $2 315266075Sdesfi 316266075SdesAC_LANG_POP 317266075Sdes])dnl AX_PTHREAD 318