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1# threadlib.m4 serial 3 (gettext-0.18)
2dnl Copyright (C) 2005-2009 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8
9dnl gl_THREADLIB
10dnl ------------
11dnl Tests for a multithreading library to be used.
12dnl Defines at most one of the macros USE_POSIX_THREADS, USE_SOLARIS_THREADS,
13dnl USE_PTH_THREADS, USE_WIN32_THREADS
14dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use
15dnl in a Makefile (LIBTHREAD for use without libtool, LTLIBTHREAD for use with
16dnl libtool).
17dnl Sets the variables LIBMULTITHREAD and LTLIBMULTITHREAD similarly, for
18dnl programs that really need multithread functionality. The difference
19dnl between LIBTHREAD and LIBMULTITHREAD is that on platforms supporting weak
20dnl symbols, typically LIBTHREAD="" whereas LIBMULTITHREAD="-lpthread".
21dnl Adds to CPPFLAGS the flag -D_REENTRANT or -D_THREAD_SAFE if needed for
22dnl multithread-safe programs.
23
24AC_DEFUN([gl_THREADLIB_EARLY],
25[
26 AC_REQUIRE([gl_THREADLIB_EARLY_BODY])
27])
28
29dnl The guts of gl_THREADLIB_EARLY. Needs to be expanded only once.
30
31AC_DEFUN([gl_THREADLIB_EARLY_BODY],
32[
33 dnl Ordering constraints: This macro modifies CPPFLAGS in a way that
34 dnl influences the result of the autoconf tests that test for *_unlocked
35 dnl declarations, on AIX 5 at least. Therefore it must come early.
36 AC_BEFORE([$0], [gl_FUNC_GLIBC_UNLOCKED_IO])dnl
37 AC_BEFORE([$0], [gl_ARGP])dnl
38
39 AC_REQUIRE([AC_CANONICAL_HOST])
40 dnl _GNU_SOURCE is needed for pthread_rwlock_t on glibc systems.
41 dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes
42 dnl AC_GNU_SOURCE.
43 m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
44 [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])],
45 [AC_REQUIRE([AC_GNU_SOURCE])])
46 dnl Check for multithreading.
47 m4_divert_text([DEFAULTS], [gl_use_threads_default=])
48 AC_ARG_ENABLE([threads],
49AC_HELP_STRING([--enable-threads={posix|solaris|pth|win32}], [specify multithreading API])
50AC_HELP_STRING([--disable-threads], [build without multithread safety]),
51 [gl_use_threads=$enableval],
52 [if test -n "$gl_use_threads_default"; then
53 gl_use_threads="$gl_use_threads_default"
54 else
55 case "$host_os" in
56 dnl Disable multithreading by default on OSF/1, because it interferes
57 dnl with fork()/exec(): When msgexec is linked with -lpthread, its
58 dnl child process gets an endless segmentation fault inside execvp().
59 osf*) gl_use_threads=no ;;
60 *) gl_use_threads=yes ;;
61 esac
62 fi
63 ])
64 if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
65 # For using <pthread.h>:
66 case "$host_os" in
67 osf*)
68 # On OSF/1, the compiler needs the flag -D_REENTRANT so that it
69 # groks <pthread.h>. cc also understands the flag -pthread, but
70 # we don't use it because 1. gcc-2.95 doesn't understand -pthread,
71 # 2. putting a flag into CPPFLAGS that has an effect on the linker
72 # causes the AC_TRY_LINK test below to succeed unexpectedly,
73 # leading to wrong values of LIBTHREAD and LTLIBTHREAD.
74 CPPFLAGS="$CPPFLAGS -D_REENTRANT"
75 ;;
76 esac
77 # Some systems optimize for single-threaded programs by default, and
78 # need special flags to disable these optimizations. For example, the
79 # definition of 'errno' in <errno.h>.
80 case "$host_os" in
81 aix* | freebsd*) CPPFLAGS="$CPPFLAGS -D_THREAD_SAFE" ;;
82 solaris*) CPPFLAGS="$CPPFLAGS -D_REENTRANT" ;;
83 esac
84 fi
85])
86
87dnl The guts of gl_THREADLIB. Needs to be expanded only once.
88
89AC_DEFUN([gl_THREADLIB_BODY],
90[
91 AC_REQUIRE([gl_THREADLIB_EARLY_BODY])
92 gl_threads_api=none
93 LIBTHREAD=
94 LTLIBTHREAD=
95 LIBMULTITHREAD=
96 LTLIBMULTITHREAD=
97 if test "$gl_use_threads" != no; then
98 dnl Check whether the compiler and linker support weak declarations.
99 AC_MSG_CHECKING([whether imported symbols can be declared weak])
100 gl_have_weak=no
101 AC_TRY_LINK([extern void xyzzy ();
102#pragma weak xyzzy], [xyzzy();], [gl_have_weak=yes])
103 AC_MSG_RESULT([$gl_have_weak])
104 if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then
105 # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that
106 # it groks <pthread.h>. It's added above, in gl_THREADLIB_EARLY_BODY.
107 AC_CHECK_HEADER([pthread.h],
108 [gl_have_pthread_h=yes], [gl_have_pthread_h=no])
109 if test "$gl_have_pthread_h" = yes; then
110 # Other possible tests:
111 # -lpthreads (FSU threads, PCthreads)
112 # -lgthreads
113 gl_have_pthread=
114 # Test whether both pthread_mutex_lock and pthread_mutexattr_init exist
115 # in libc. IRIX 6.5 has the first one in both libc and libpthread, but
116 # the second one only in libpthread, and lock.c needs it.
117 AC_TRY_LINK([#include <pthread.h>],
118 [pthread_mutex_lock((pthread_mutex_t*)0);
119 pthread_mutexattr_init((pthread_mutexattr_t*)0);],
120 [gl_have_pthread=yes])
121 # Test for libpthread by looking for pthread_kill. (Not pthread_self,
122 # since it is defined as a macro on OSF/1.)
123 if test -n "$gl_have_pthread"; then
124 # The program links fine without libpthread. But it may actually
125 # need to link with libpthread in order to create multiple threads.
126 AC_CHECK_LIB([pthread], [pthread_kill],
127 [LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread
128 # On Solaris and HP-UX, most pthread functions exist also in libc.
129 # Therefore pthread_in_use() needs to actually try to create a
130 # thread: pthread_create from libc will fail, whereas
131 # pthread_create will actually create a thread.
132 case "$host_os" in
133 solaris* | hpux*)
134 AC_DEFINE([PTHREAD_IN_USE_DETECTION_HARD], [1],
135 [Define if the pthread_in_use() detection is hard.])
136 esac
137 ])
138 else
139 # Some library is needed. Try libpthread and libc_r.
140 AC_CHECK_LIB([pthread], [pthread_kill],
141 [gl_have_pthread=yes
142 LIBTHREAD=-lpthread LTLIBTHREAD=-lpthread
143 LIBMULTITHREAD=-lpthread LTLIBMULTITHREAD=-lpthread])
144 if test -z "$gl_have_pthread"; then
145 # For FreeBSD 4.
146 AC_CHECK_LIB([c_r], [pthread_kill],
147 [gl_have_pthread=yes
148 LIBTHREAD=-lc_r LTLIBTHREAD=-lc_r
149 LIBMULTITHREAD=-lc_r LTLIBMULTITHREAD=-lc_r])
150 fi
151 fi
152 if test -n "$gl_have_pthread"; then
153 gl_threads_api=posix
154 AC_DEFINE([USE_POSIX_THREADS], [1],
155 [Define if the POSIX multithreading library can be used.])
156 if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
157 if test $gl_have_weak = yes; then
158 AC_DEFINE([USE_POSIX_THREADS_WEAK], [1],
159 [Define if references to the POSIX multithreading library should be made weak.])
160 LIBTHREAD=
161 LTLIBTHREAD=
162 fi
163 fi
164 fi
165 fi
166 fi
167 if test -z "$gl_have_pthread"; then
168 if test "$gl_use_threads" = yes || test "$gl_use_threads" = solaris; then
169 gl_have_solaristhread=
170 gl_save_LIBS="$LIBS"
171 LIBS="$LIBS -lthread"
172 AC_TRY_LINK([#include <thread.h>
173#include <synch.h>],
174 [thr_self();],
175 [gl_have_solaristhread=yes])
176 LIBS="$gl_save_LIBS"
177 if test -n "$gl_have_solaristhread"; then
178 gl_threads_api=solaris
179 LIBTHREAD=-lthread
180 LTLIBTHREAD=-lthread
181 LIBMULTITHREAD="$LIBTHREAD"
182 LTLIBMULTITHREAD="$LTLIBTHREAD"
183 AC_DEFINE([USE_SOLARIS_THREADS], [1],
184 [Define if the old Solaris multithreading library can be used.])
185 if test $gl_have_weak = yes; then
186 AC_DEFINE([USE_SOLARIS_THREADS_WEAK], [1],
187 [Define if references to the old Solaris multithreading library should be made weak.])
188 LIBTHREAD=
189 LTLIBTHREAD=
190 fi
191 fi
192 fi
193 fi
194 if test "$gl_use_threads" = pth; then
195 gl_save_CPPFLAGS="$CPPFLAGS"
196 AC_LIB_LINKFLAGS([pth])
197 gl_have_pth=
198 gl_save_LIBS="$LIBS"
199 LIBS="$LIBS -lpth"
200 AC_TRY_LINK([#include <pth.h>], [pth_self();], [gl_have_pth=yes])
201 LIBS="$gl_save_LIBS"
202 if test -n "$gl_have_pth"; then
203 gl_threads_api=pth
204 LIBTHREAD="$LIBPTH"
205 LTLIBTHREAD="$LTLIBPTH"
206 LIBMULTITHREAD="$LIBTHREAD"
207 LTLIBMULTITHREAD="$LTLIBTHREAD"
208 AC_DEFINE([USE_PTH_THREADS], [1],
209 [Define if the GNU Pth multithreading library can be used.])
210 if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then
211 if test $gl_have_weak = yes; then
212 AC_DEFINE([USE_PTH_THREADS_WEAK], [1],
213 [Define if references to the GNU Pth multithreading library should be made weak.])
214 LIBTHREAD=
215 LTLIBTHREAD=
216 fi
217 fi
218 else
219 CPPFLAGS="$gl_save_CPPFLAGS"
220 fi
221 fi
222 if test -z "$gl_have_pthread"; then
223 if test "$gl_use_threads" = yes || test "$gl_use_threads" = win32; then
224 if { case "$host_os" in
225 mingw*) true;;
226 *) false;;
227 esac
228 }; then
229 gl_threads_api=win32
230 AC_DEFINE([USE_WIN32_THREADS], [1],
231 [Define if the Win32 multithreading API can be used.])
232 fi
233 fi
234 fi
235 fi
236 AC_MSG_CHECKING([for multithread API to use])
237 AC_MSG_RESULT([$gl_threads_api])
238 AC_SUBST([LIBTHREAD])
239 AC_SUBST([LTLIBTHREAD])
240 AC_SUBST([LIBMULTITHREAD])
241 AC_SUBST([LTLIBMULTITHREAD])
242])
243
244AC_DEFUN([gl_THREADLIB],
245[
246 AC_REQUIRE([gl_THREADLIB_EARLY])
247 AC_REQUIRE([gl_THREADLIB_BODY])
248])
249
250
251dnl gl_DISABLE_THREADS
252dnl ------------------
253dnl Sets the gl_THREADLIB default so that threads are not used by default.
254dnl The user can still override it at installation time, by using the
255dnl configure option '--enable-threads'.
256
257AC_DEFUN([gl_DISABLE_THREADS], [
258 m4_divert_text([INIT_PREPARE], [gl_use_threads_default=no])
259])
260
261
262dnl Survey of platforms:
263dnl
264dnl Platform Available Compiler Supports test-lock
265dnl flavours option weak result
266dnl --------------- --------- --------- -------- ---------
267dnl Linux 2.4/glibc posix -lpthread Y OK
268dnl
269dnl GNU Hurd/glibc posix
270dnl
271dnl FreeBSD 5.3 posix -lc_r Y
272dnl posix -lkse ? Y
273dnl posix -lpthread ? Y
274dnl posix -lthr Y
275dnl
276dnl FreeBSD 5.2 posix -lc_r Y
277dnl posix -lkse Y
278dnl posix -lthr Y
279dnl
280dnl FreeBSD 4.0,4.10 posix -lc_r Y OK
281dnl
282dnl NetBSD 1.6 --
283dnl
284dnl OpenBSD 3.4 posix -lpthread Y OK
285dnl
286dnl MacOS X 10.[123] posix -lpthread Y OK
287dnl
288dnl Solaris 7,8,9 posix -lpthread Y Sol 7,8: 0.0; Sol 9: OK
289dnl solaris -lthread Y Sol 7,8: 0.0; Sol 9: OK
290dnl
291dnl HP-UX 11 posix -lpthread N (cc) OK
292dnl Y (gcc)
293dnl
294dnl IRIX 6.5 posix -lpthread Y 0.5
295dnl
296dnl AIX 4.3,5.1 posix -lpthread N AIX 4: 0.5; AIX 5: OK
297dnl
298dnl OSF/1 4.0,5.1 posix -pthread (cc) N OK
299dnl -lpthread (gcc) Y
300dnl
301dnl Cygwin posix -lpthread Y OK
302dnl
303dnl Any of the above pth -lpth 0.0
304dnl
305dnl Mingw win32 N OK
306dnl
307dnl BeOS 5 --
308dnl
309dnl The test-lock result shows what happens if in test-lock.c EXPLICIT_YIELD is
310dnl turned off:
311dnl OK if all three tests terminate OK,
312dnl 0.5 if the first test terminates OK but the second one loops endlessly,
313dnl 0.0 if the first test already loops endlessly.