1290001Sglebius##### http://autoconf-archive.cryp.to/acx_pthread.html 2290001Sglebius# 3290001Sglebius# SYNOPSIS 4290001Sglebius# 5290001Sglebius# ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) 6290001Sglebius# 7290001Sglebius# DESCRIPTION 8290001Sglebius# 9290001Sglebius# This macro figures out how to build C programs using POSIX threads. 10290001Sglebius# It sets the PTHREAD_LIBS output variable to the threads library and 11290001Sglebius# linker flags, and the PTHREAD_CFLAGS output variable to any special 12290001Sglebius# C compiler flags that are needed. (The user can also force certain 13290001Sglebius# compiler flags/libs to be tested by setting these environment 14290001Sglebius# variables.) 15290001Sglebius# 16290001Sglebius# Also sets PTHREAD_CC to any special C compiler that is needed for 17290001Sglebius# multi-threaded programs (defaults to the value of CC otherwise). 18290001Sglebius# (This is necessary on AIX to use the special cc_r compiler alias.) 19290001Sglebius# 20290001Sglebius# NOTE: You are assumed to not only compile your program with these 21290001Sglebius# flags, but also link it with them as well. e.g. you should link 22290001Sglebius# with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS 23290001Sglebius# $LIBS 24290001Sglebius# 25290001Sglebius# If you are only building threads programs, you may wish to use 26290001Sglebius# these variables in your default LIBS, CFLAGS, and CC: 27290001Sglebius# 28290001Sglebius# LIBS="$PTHREAD_LIBS $LIBS" 29290001Sglebius# CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 30290001Sglebius# CC="$PTHREAD_CC" 31290001Sglebius# 32290001Sglebius# In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute 33290001Sglebius# constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to 34290001Sglebius# that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX). 35290001Sglebius# 36290001Sglebius# ACTION-IF-FOUND is a list of shell commands to run if a threads 37290001Sglebius# library is found, and ACTION-IF-NOT-FOUND is a list of commands to 38290001Sglebius# run it if it is not found. If ACTION-IF-FOUND is not specified, the 39290001Sglebius# default action will define HAVE_PTHREAD. 40290001Sglebius# 41290001Sglebius# Please let the authors know if this macro fails on any platform, or 42290001Sglebius# if you have any other suggestions or comments. This macro was based 43290001Sglebius# on work by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) 44290001Sglebius# (with help from M. Frigo), as well as ac_pthread and hb_pthread 45290001Sglebius# macros posted by Alejandro Forero Cuervo to the autoconf macro 46290001Sglebius# repository. We are also grateful for the helpful feedback of 47290001Sglebius# numerous users. 48290001Sglebius# 49290001Sglebius# LAST MODIFICATION 50290001Sglebius# 51290001Sglebius# 2007-07-29 52290001Sglebius# 53290001Sglebius# COPYLEFT 54290001Sglebius# 55290001Sglebius# Copyright (c) 2007 Steven G. Johnson <stevenj@alum.mit.edu> 56290001Sglebius# 57290001Sglebius# This program is free software: you can redistribute it and/or 58290001Sglebius# modify it under the terms of the GNU General Public License as 59290001Sglebius# published by the Free Software Foundation, either version 3 of the 60290001Sglebius# License, or (at your option) any later version. 61290001Sglebius# 62290001Sglebius# This program is distributed in the hope that it will be useful, but 63290001Sglebius# WITHOUT ANY WARRANTY; without even the implied warranty of 64290001Sglebius# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 65290001Sglebius# General Public License for more details. 66290001Sglebius# 67290001Sglebius# You should have received a copy of the GNU General Public License 68290001Sglebius# along with this program. If not, see 69290001Sglebius# <http://www.gnu.org/licenses/>. 70290001Sglebius# 71290001Sglebius# As a special exception, the respective Autoconf Macro's copyright 72290001Sglebius# owner gives unlimited permission to copy, distribute and modify the 73290001Sglebius# configure scripts that are the output of Autoconf when processing 74290001Sglebius# the Macro. You need not follow the terms of the GNU General Public 75290001Sglebius# License when using or distributing such scripts, even though 76290001Sglebius# portions of the text of the Macro appear in them. The GNU General 77290001Sglebius# Public License (GPL) does govern all other use of the material that 78290001Sglebius# constitutes the Autoconf Macro. 79290001Sglebius# 80290001Sglebius# This special exception to the GPL applies to versions of the 81290001Sglebius# Autoconf Macro released by the Autoconf Macro Archive. When you 82290001Sglebius# make and distribute a modified version of the Autoconf Macro, you 83290001Sglebius# may extend this special exception to the GPL to apply to your 84290001Sglebius# modified version as well. 85290001Sglebius 86290001SglebiusAC_DEFUN([ACX_PTHREAD], [ 87290001SglebiusAC_REQUIRE([AC_CANONICAL_HOST]) 88290001SglebiusAC_LANG_SAVE 89290001SglebiusAC_LANG_C 90290001Sglebiusacx_pthread_ok=no 91290001Sglebius 92290001Sglebius# We used to check for pthread.h first, but this fails if pthread.h 93290001Sglebius# requires special compiler flags (e.g. on True64 or Sequent). 94290001Sglebius# It gets checked for in the link test anyway. 95290001Sglebius 96290001Sglebius# First of all, check if the user has set any of the PTHREAD_LIBS, 97290001Sglebius# etcetera environment variables, and if threads linking works using 98290001Sglebius# them: 99290001Sglebiusif test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then 100290001Sglebius save_CFLAGS="$CFLAGS" 101290001Sglebius CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 102290001Sglebius save_LIBS="$LIBS" 103290001Sglebius LIBS="$PTHREAD_LIBS $LIBS" 104290001Sglebius AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) 105290001Sglebius AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) 106290001Sglebius AC_MSG_RESULT($acx_pthread_ok) 107290001Sglebius if test x"$acx_pthread_ok" = xno; then 108290001Sglebius PTHREAD_LIBS="" 109290001Sglebius PTHREAD_CFLAGS="" 110290001Sglebius fi 111290001Sglebius LIBS="$save_LIBS" 112290001Sglebius CFLAGS="$save_CFLAGS" 113290001Sglebiusfi 114290001Sglebius 115290001Sglebius# We must check for the threads library under a number of different 116290001Sglebius# names; the ordering is very important because some systems 117290001Sglebius# (e.g. DEC) have both -lpthread and -lpthreads, where one of the 118290001Sglebius# libraries is broken (non-POSIX). 119290001Sglebius 120290001Sglebius# Create a list of thread flags to try. Items starting with a "-" are 121290001Sglebius# C compiler flags, and other items are library names, except for "none" 122290001Sglebius# which indicates that we try without any flags at all, and "pthread-config" 123290001Sglebius# which is a program returning the flags for the Pth emulation library. 124290001Sglebius 125290001Sglebiusacx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" 126290001Sglebius 127290001Sglebius# The ordering *is* (sometimes) important. Some notes on the 128290001Sglebius# individual items follow: 129290001Sglebius 130290001Sglebius# pthreads: AIX (must check this before -lpthread) 131290001Sglebius# none: in case threads are in libc; should be tried before -Kthread and 132290001Sglebius# other compiler flags to prevent continual compiler warnings 133290001Sglebius# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) 134290001Sglebius# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) 135290001Sglebius# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) 136290001Sglebius# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) 137290001Sglebius# -pthreads: Solaris/gcc 138290001Sglebius# -mthreads: Mingw32/gcc, Lynx/gcc 139290001Sglebius# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it 140290001Sglebius# doesn't hurt to check since this sometimes defines pthreads too; 141290001Sglebius# also defines -D_REENTRANT) 142290001Sglebius# ... -mt is also the pthreads flag for HP/aCC 143290001Sglebius# pthread: Linux, etcetera 144290001Sglebius# --thread-safe: KAI C++ 145290001Sglebius# pthread-config: use pthread-config program (for GNU Pth library) 146290001Sglebius 147290001Sglebiuscase "${host_cpu}-${host_os}" in 148290001Sglebius *solaris*) 149290001Sglebius 150290001Sglebius # On Solaris (at least, for some versions), libc contains stubbed 151290001Sglebius # (non-functional) versions of the pthreads routines, so link-based 152290001Sglebius # tests will erroneously succeed. (We need to link with -pthreads/-mt/ 153290001Sglebius # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather 154290001Sglebius # a function called by this macro, so we could check for that, but 155290001Sglebius # who knows whether they'll stub that too in a future libc.) So, 156290001Sglebius # we'll just look for -pthreads and -lpthread first: 157290001Sglebius 158290001Sglebius acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" 159290001Sglebius ;; 160290001Sglebiusesac 161290001Sglebius 162290001Sglebiusif test x"$acx_pthread_ok" = xno; then 163290001Sglebiusfor flag in $acx_pthread_flags; do 164290001Sglebius 165290001Sglebius case $flag in 166290001Sglebius none) 167290001Sglebius AC_MSG_CHECKING([whether pthreads work without any flags]) 168290001Sglebius ;; 169290001Sglebius 170290001Sglebius -*) 171290001Sglebius AC_MSG_CHECKING([whether pthreads work with $flag]) 172290001Sglebius PTHREAD_CFLAGS="$flag" 173290001Sglebius ;; 174290001Sglebius 175290001Sglebius pthread-config) 176290001Sglebius AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) 177290001Sglebius if test x"$acx_pthread_config" = xno; then continue; fi 178290001Sglebius PTHREAD_CFLAGS="`pthread-config --cflags`" 179290001Sglebius PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" 180290001Sglebius ;; 181290001Sglebius 182290001Sglebius *) 183290001Sglebius AC_MSG_CHECKING([for the pthreads library -l$flag]) 184290001Sglebius PTHREAD_LIBS="-l$flag" 185290001Sglebius ;; 186290001Sglebius esac 187290001Sglebius 188290001Sglebius save_LIBS="$LIBS" 189290001Sglebius save_CFLAGS="$CFLAGS" 190290001Sglebius LIBS="$PTHREAD_LIBS $LIBS" 191290001Sglebius CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 192290001Sglebius 193290001Sglebius # Check for various functions. We must include pthread.h, 194290001Sglebius # since some functions may be macros. (On the Sequent, we 195290001Sglebius # need a special flag -Kthread to make this header compile.) 196290001Sglebius # We check for pthread_join because it is in -lpthread on IRIX 197290001Sglebius # while pthread_create is in libc. We check for pthread_attr_init 198290001Sglebius # due to DEC craziness with -lpthreads. We check for 199290001Sglebius # pthread_cleanup_push because it is one of the few pthread 200290001Sglebius # functions on Solaris that doesn't have a non-functional libc stub. 201290001Sglebius # We try pthread_create on general principles. 202290001Sglebius AC_TRY_LINK([#include <pthread.h>], 203290001Sglebius [pthread_t th; pthread_join(th, 0); 204290001Sglebius pthread_attr_init(0); pthread_cleanup_push(0, 0); 205290001Sglebius pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], 206290001Sglebius [acx_pthread_ok=yes]) 207290001Sglebius 208290001Sglebius LIBS="$save_LIBS" 209290001Sglebius CFLAGS="$save_CFLAGS" 210290001Sglebius 211290001Sglebius AC_MSG_RESULT($acx_pthread_ok) 212290001Sglebius if test "x$acx_pthread_ok" = xyes; then 213290001Sglebius break; 214290001Sglebius fi 215290001Sglebius 216290001Sglebius PTHREAD_LIBS="" 217290001Sglebius PTHREAD_CFLAGS="" 218290001Sglebiusdone 219290001Sglebiusfi 220290001Sglebius 221290001Sglebius# Various other checks: 222290001Sglebiusif test "x$acx_pthread_ok" = xyes; then 223290001Sglebius save_LIBS="$LIBS" 224290001Sglebius LIBS="$PTHREAD_LIBS $LIBS" 225290001Sglebius save_CFLAGS="$CFLAGS" 226290001Sglebius CFLAGS="$CFLAGS $PTHREAD_CFLAGS" 227290001Sglebius 228290001Sglebius # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. 229290001Sglebius AC_MSG_CHECKING([for joinable pthread attribute]) 230290001Sglebius attr_name=unknown 231290001Sglebius for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do 232290001Sglebius AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], 233290001Sglebius [attr_name=$attr; break]) 234290001Sglebius done 235290001Sglebius AC_MSG_RESULT($attr_name) 236290001Sglebius if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then 237290001Sglebius AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, 238290001Sglebius [Define to necessary symbol if this constant 239290001Sglebius uses a non-standard name on your system.]) 240290001Sglebius fi 241290001Sglebius 242290001Sglebius AC_MSG_CHECKING([if more special flags are required for pthreads]) 243290001Sglebius flag=no 244290001Sglebius case "${host_cpu}-${host_os}" in 245290001Sglebius *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; 246290001Sglebius *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; 247290001Sglebius esac 248290001Sglebius AC_MSG_RESULT(${flag}) 249290001Sglebius if test "x$flag" != xno; then 250290001Sglebius PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" 251290001Sglebius fi 252290001Sglebius 253290001Sglebius LIBS="$save_LIBS" 254290001Sglebius CFLAGS="$save_CFLAGS" 255290001Sglebius 256290001Sglebius # More AIX lossage: must compile with xlc_r or cc_r 257290001Sglebius if test x"$GCC" != xyes; then 258290001Sglebius AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) 259290001Sglebius else 260290001Sglebius PTHREAD_CC=$CC 261290001Sglebius fi 262290001Sglebiuselse 263290001Sglebius PTHREAD_CC="$CC" 264290001Sglebiusfi 265290001Sglebius 266290001SglebiusAC_SUBST(PTHREAD_LIBS) 267290001SglebiusAC_SUBST(PTHREAD_CFLAGS) 268290001SglebiusAC_SUBST(PTHREAD_CC) 269290001Sglebius 270290001Sglebius# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: 271290001Sglebiusif test x"$acx_pthread_ok" = xyes; then 272290001Sglebius ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) 273290001Sglebius : 274290001Sglebiuselse 275290001Sglebius acx_pthread_ok=no 276290001Sglebius $2 277290001Sglebiusfi 278290001SglebiusAC_LANG_RESTORE 279290001Sglebius])dnl ACX_PTHREAD 280