cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 1 | # =========================================================================== |
cristy | 430a731 | 2010-01-21 20:44:04 +0000 | [diff] [blame^] | 2 | # http://www.nongnu.org/autoconf-archive/acx_pthread.html |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 3 | # =========================================================================== |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 4 | # |
| 5 | # SYNOPSIS |
| 6 | # |
| 7 | # ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]]) |
| 8 | # |
| 9 | # DESCRIPTION |
| 10 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 11 | # This macro figures out how to build C programs using POSIX threads. It |
| 12 | # sets the PTHREAD_LIBS output variable to the threads library and linker |
| 13 | # flags, and the PTHREAD_CFLAGS output variable to any special C compiler |
| 14 | # flags that are needed. (The user can also force certain compiler |
| 15 | # flags/libs to be tested by setting these environment variables.) |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 16 | # |
| 17 | # Also sets PTHREAD_CC to any special C compiler that is needed for |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 18 | # multi-threaded programs (defaults to the value of CC otherwise). (This |
| 19 | # is necessary on AIX to use the special cc_r compiler alias.) |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 20 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 21 | # NOTE: You are assumed to not only compile your program with these flags, |
| 22 | # but also link it with them as well. e.g. you should link with |
| 23 | # $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 24 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 25 | # If you are only building threads programs, you may wish to use these |
| 26 | # variables in your default LIBS, CFLAGS, and CC: |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 27 | # |
| 28 | # LIBS="$PTHREAD_LIBS $LIBS" |
| 29 | # CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| 30 | # CC="$PTHREAD_CC" |
| 31 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 32 | # In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant |
| 33 | # has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name |
| 34 | # (e.g. PTHREAD_CREATE_UNDETACHED on AIX). |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 35 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 36 | # ACTION-IF-FOUND is a list of shell commands to run if a threads library |
| 37 | # is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it |
| 38 | # is not found. If ACTION-IF-FOUND is not specified, the default action |
| 39 | # will define HAVE_PTHREAD. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 40 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 41 | # Please let the authors know if this macro fails on any platform, or if |
| 42 | # you have any other suggestions or comments. This macro was based on work |
| 43 | # by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help |
| 44 | # from M. Frigo), as well as ac_pthread and hb_pthread macros posted by |
| 45 | # Alejandro Forero Cuervo to the autoconf macro repository. We are also |
| 46 | # grateful for the helpful feedback of numerous users. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 47 | # |
cristy | 430a731 | 2010-01-21 20:44:04 +0000 | [diff] [blame^] | 48 | # LICENSE |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 49 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 50 | # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 51 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 52 | # This program is free software: you can redistribute it and/or modify it |
| 53 | # under the terms of the GNU General Public License as published by the |
| 54 | # Free Software Foundation, either version 3 of the License, or (at your |
| 55 | # option) any later version. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 56 | # |
| 57 | # This program is distributed in the hope that it will be useful, but |
| 58 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 59 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 60 | # Public License for more details. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 61 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 62 | # You should have received a copy of the GNU General Public License along |
| 63 | # with this program. If not, see <http://www.gnu.org/licenses/>. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 64 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 65 | # As a special exception, the respective Autoconf Macro's copyright owner |
| 66 | # gives unlimited permission to copy, distribute and modify the configure |
| 67 | # scripts that are the output of Autoconf when processing the Macro. You |
| 68 | # need not follow the terms of the GNU General Public License when using |
| 69 | # or distributing such scripts, even though portions of the text of the |
| 70 | # Macro appear in them. The GNU General Public License (GPL) does govern |
| 71 | # all other use of the material that constitutes the Autoconf Macro. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 72 | # |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 73 | # This special exception to the GPL applies to versions of the Autoconf |
cristy | 430a731 | 2010-01-21 20:44:04 +0000 | [diff] [blame^] | 74 | # Macro released by the Autoconf Archive. When you make and distribute a |
| 75 | # modified version of the Autoconf Macro, you may extend this special |
| 76 | # exception to the GPL to apply to your modified version as well. |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 77 | |
| 78 | AC_DEFUN([ACX_PTHREAD], [ |
| 79 | AC_REQUIRE([AC_CANONICAL_HOST]) |
| 80 | AC_LANG_SAVE |
| 81 | AC_LANG_C |
| 82 | acx_pthread_ok=no |
| 83 | |
| 84 | # We used to check for pthread.h first, but this fails if pthread.h |
| 85 | # requires special compiler flags (e.g. on True64 or Sequent). |
| 86 | # It gets checked for in the link test anyway. |
| 87 | |
| 88 | # First of all, check if the user has set any of the PTHREAD_LIBS, |
| 89 | # etcetera environment variables, and if threads linking works using |
| 90 | # them: |
| 91 | if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then |
| 92 | save_CFLAGS="$CFLAGS" |
| 93 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| 94 | save_LIBS="$LIBS" |
| 95 | LIBS="$PTHREAD_LIBS $LIBS" |
| 96 | AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) |
| 97 | AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) |
| 98 | AC_MSG_RESULT($acx_pthread_ok) |
| 99 | if test x"$acx_pthread_ok" = xno; then |
| 100 | PTHREAD_LIBS="" |
| 101 | PTHREAD_CFLAGS="" |
| 102 | fi |
| 103 | LIBS="$save_LIBS" |
| 104 | CFLAGS="$save_CFLAGS" |
| 105 | fi |
| 106 | |
| 107 | # We must check for the threads library under a number of different |
| 108 | # names; the ordering is very important because some systems |
| 109 | # (e.g. DEC) have both -lpthread and -lpthreads, where one of the |
| 110 | # libraries is broken (non-POSIX). |
| 111 | |
| 112 | # Create a list of thread flags to try. Items starting with a "-" are |
| 113 | # C compiler flags, and other items are library names, except for "none" |
| 114 | # which indicates that we try without any flags at all, and "pthread-config" |
| 115 | # which is a program returning the flags for the Pth emulation library. |
| 116 | |
| 117 | acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config" |
| 118 | |
| 119 | # The ordering *is* (sometimes) important. Some notes on the |
| 120 | # individual items follow: |
| 121 | |
| 122 | # pthreads: AIX (must check this before -lpthread) |
| 123 | # none: in case threads are in libc; should be tried before -Kthread and |
| 124 | # other compiler flags to prevent continual compiler warnings |
| 125 | # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) |
| 126 | # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) |
| 127 | # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) |
| 128 | # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) |
| 129 | # -pthreads: Solaris/gcc |
| 130 | # -mthreads: Mingw32/gcc, Lynx/gcc |
| 131 | # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it |
| 132 | # doesn't hurt to check since this sometimes defines pthreads too; |
| 133 | # also defines -D_REENTRANT) |
| 134 | # ... -mt is also the pthreads flag for HP/aCC |
| 135 | # pthread: Linux, etcetera |
| 136 | # --thread-safe: KAI C++ |
| 137 | # pthread-config: use pthread-config program (for GNU Pth library) |
| 138 | |
| 139 | case "${host_cpu}-${host_os}" in |
| 140 | *solaris*) |
| 141 | |
| 142 | # On Solaris (at least, for some versions), libc contains stubbed |
| 143 | # (non-functional) versions of the pthreads routines, so link-based |
| 144 | # tests will erroneously succeed. (We need to link with -pthreads/-mt/ |
| 145 | # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather |
| 146 | # a function called by this macro, so we could check for that, but |
| 147 | # who knows whether they'll stub that too in a future libc.) So, |
| 148 | # we'll just look for -pthreads and -lpthread first: |
| 149 | |
| 150 | acx_pthread_flags="-pthreads pthread -mt -pthread $acx_pthread_flags" |
| 151 | ;; |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 152 | esac |
| 153 | |
| 154 | if test x"$acx_pthread_ok" = xno; then |
| 155 | for flag in $acx_pthread_flags; do |
| 156 | |
| 157 | case $flag in |
| 158 | none) |
| 159 | AC_MSG_CHECKING([whether pthreads work without any flags]) |
| 160 | ;; |
| 161 | |
| 162 | -*) |
| 163 | AC_MSG_CHECKING([whether pthreads work with $flag]) |
| 164 | PTHREAD_CFLAGS="$flag" |
| 165 | ;; |
| 166 | |
| 167 | pthread-config) |
| 168 | AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no) |
| 169 | if test x"$acx_pthread_config" = xno; then continue; fi |
| 170 | PTHREAD_CFLAGS="`pthread-config --cflags`" |
| 171 | PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`" |
| 172 | ;; |
| 173 | |
| 174 | *) |
| 175 | AC_MSG_CHECKING([for the pthreads library -l$flag]) |
| 176 | PTHREAD_LIBS="-l$flag" |
| 177 | ;; |
| 178 | esac |
| 179 | |
| 180 | save_LIBS="$LIBS" |
| 181 | save_CFLAGS="$CFLAGS" |
| 182 | LIBS="$PTHREAD_LIBS $LIBS" |
| 183 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| 184 | |
| 185 | # Check for various functions. We must include pthread.h, |
| 186 | # since some functions may be macros. (On the Sequent, we |
| 187 | # need a special flag -Kthread to make this header compile.) |
| 188 | # We check for pthread_join because it is in -lpthread on IRIX |
| 189 | # while pthread_create is in libc. We check for pthread_attr_init |
| 190 | # due to DEC craziness with -lpthreads. We check for |
| 191 | # pthread_cleanup_push because it is one of the few pthread |
| 192 | # functions on Solaris that doesn't have a non-functional libc stub. |
| 193 | # We try pthread_create on general principles. |
| 194 | AC_TRY_LINK([#include <pthread.h>], |
| 195 | [pthread_t th; pthread_join(th, 0); |
| 196 | pthread_attr_init(0); pthread_cleanup_push(0, 0); |
| 197 | pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], |
| 198 | [acx_pthread_ok=yes]) |
| 199 | |
| 200 | LIBS="$save_LIBS" |
| 201 | CFLAGS="$save_CFLAGS" |
| 202 | |
| 203 | AC_MSG_RESULT($acx_pthread_ok) |
| 204 | if test "x$acx_pthread_ok" = xyes; then |
| 205 | break; |
| 206 | fi |
| 207 | |
| 208 | PTHREAD_LIBS="" |
| 209 | PTHREAD_CFLAGS="" |
| 210 | done |
| 211 | fi |
| 212 | |
| 213 | # Various other checks: |
| 214 | if test "x$acx_pthread_ok" = xyes; then |
| 215 | save_LIBS="$LIBS" |
| 216 | LIBS="$PTHREAD_LIBS $LIBS" |
| 217 | save_CFLAGS="$CFLAGS" |
| 218 | CFLAGS="$CFLAGS $PTHREAD_CFLAGS" |
| 219 | |
| 220 | # Detect AIX lossage: JOINABLE attribute is called UNDETACHED. |
| 221 | AC_MSG_CHECKING([for joinable pthread attribute]) |
| 222 | attr_name=unknown |
| 223 | for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do |
| 224 | AC_TRY_LINK([#include <pthread.h>], [int attr=$attr; return attr;], |
| 225 | [attr_name=$attr; break]) |
| 226 | done |
| 227 | AC_MSG_RESULT($attr_name) |
| 228 | if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then |
| 229 | AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name, |
| 230 | [Define to necessary symbol if this constant |
| 231 | uses a non-standard name on your system.]) |
| 232 | fi |
| 233 | |
| 234 | AC_MSG_CHECKING([if more special flags are required for pthreads]) |
| 235 | flag=no |
| 236 | case "${host_cpu}-${host_os}" in |
| 237 | *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";; |
| 238 | *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; |
| 239 | esac |
| 240 | AC_MSG_RESULT(${flag}) |
| 241 | if test "x$flag" != xno; then |
| 242 | PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" |
| 243 | fi |
| 244 | |
| 245 | LIBS="$save_LIBS" |
| 246 | CFLAGS="$save_CFLAGS" |
| 247 | |
| 248 | # More AIX lossage: must compile with xlc_r or cc_r |
cristy | 736173a | 2009-09-20 21:18:22 +0000 | [diff] [blame] | 249 | if test x"$GCC" != xyes; then |
| 250 | AC_CHECK_PROGS(PTHREAD_CC, xlc_r cc_r, ${CC}) |
| 251 | else |
| 252 | PTHREAD_CC=$CC |
| 253 | fi |
| 254 | else |
| 255 | PTHREAD_CC="$CC" |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 256 | fi |
| 257 | |
| 258 | AC_SUBST(PTHREAD_LIBS) |
| 259 | AC_SUBST(PTHREAD_CFLAGS) |
| 260 | AC_SUBST(PTHREAD_CC) |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 261 | |
| 262 | # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: |
| 263 | if test x"$acx_pthread_ok" = xyes; then |
| 264 | ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) |
| 265 | : |
| 266 | else |
| 267 | acx_pthread_ok=no |
| 268 | $2 |
| 269 | fi |
| 270 | AC_LANG_RESTORE |
| 271 | ])dnl ACX_PTHREAD |