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1 office 1 dnl Available from the GNU Autoconf Macro Archive at:
2 dnl http://www.gnu.org/software/ac-archive/htmldoc/acx_pthread.html
3 dnl
4 AC_DEFUN([ACX_PTHREAD], [
5 AC_REQUIRE([AC_CANONICAL_HOST])
6 AC_LANG_SAVE
7 AC_LANG_C
8 acx_pthread_ok=no
9  
10 # We used to check for pthread.h first, but this fails if pthread.h
11 # requires special compiler flags (e.g. on True64 or Sequent).
12 # It gets checked for in the link test anyway.
13  
14 # First of all, check if the user has set any of the PTHREAD_LIBS,
15 # etcetera environment variables, and if threads linking works using
16 # them:
17 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
18 save_CFLAGS="$CFLAGS"
19 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
20 save_LIBS="$LIBS"
21 LIBS="$PTHREAD_LIBS $LIBS"
22 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
23 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
24 AC_MSG_RESULT($acx_pthread_ok)
25 if test x"$acx_pthread_ok" = xno; then
26 PTHREAD_LIBS=""
27 PTHREAD_CFLAGS=""
28 fi
29 LIBS="$save_LIBS"
30 CFLAGS="$save_CFLAGS"
31 fi
32  
33 # We must check for the threads library under a number of different
34 # names; the ordering is very important because some systems
35 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
36 # libraries is broken (non-POSIX).
37  
38 # Create a list of thread flags to try. Items starting with a "-" are
39 # C compiler flags, and other items are library names, except for "none"
40 # which indicates that we try without any flags at all, and "pthread-config"
41 # which is a program returning the flags for the Pth emulation library.
42  
43 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
44  
45 # The ordering *is* (sometimes) important. Some notes on the
46 # individual items follow:
47  
48 # pthreads: AIX (must check this before -lpthread)
49 # none: in case threads are in libc; should be tried before -Kthread and
50 # other compiler flags to prevent continual compiler warnings
51 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
52 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
53 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
54 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
55 # -pthreads: Solaris/gcc
56 # -mthreads: Mingw32/gcc, Lynx/gcc
57 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
58 # doesn't hurt to check since this sometimes defines pthreads too;
59 # also defines -D_REENTRANT)
60 # pthread: Linux, etcetera
61 # --thread-safe: KAI C++
62 # pthread-config: use pthread-config program (for GNU Pth library)
63  
64 case "${host_cpu}-${host_os}" in
65 *solaris*)
66  
67 # On Solaris (at least, for some versions), libc contains stubbed
68 # (non-functional) versions of the pthreads routines, so link-based
69 # tests will erroneously succeed. (We need to link with -pthread or
70 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
71 # a function called by this macro, so we could check for that, but
72 # who knows whether they'll stub that too in a future libc.) So,
73 # we'll just look for -pthreads and -lpthread first:
74  
75 acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
76 ;;
77 esac
78  
79 if test x"$acx_pthread_ok" = xno; then
80 for flag in $acx_pthread_flags; do
81  
82 case $flag in
83 none)
84 AC_MSG_CHECKING([whether pthreads work without any flags])
85 ;;
86  
87 -*)
88 AC_MSG_CHECKING([whether pthreads work with $flag])
89 PTHREAD_CFLAGS="$flag"
90 ;;
91  
92 pthread-config)
93 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
94 if test x"$acx_pthread_config" = xno; then continue; fi
95 PTHREAD_CFLAGS="`pthread-config --cflags`"
96 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
97 ;;
98  
99 *)
100 AC_MSG_CHECKING([for the pthreads library -l$flag])
101 PTHREAD_LIBS="-l$flag"
102 ;;
103 esac
104  
105 save_LIBS="$LIBS"
106 save_CFLAGS="$CFLAGS"
107 LIBS="$PTHREAD_LIBS $LIBS"
108 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
109  
110 # Check for various functions. We must include pthread.h,
111 # since some functions may be macros. (On the Sequent, we
112 # need a special flag -Kthread to make this header compile.)
113 # We check for pthread_join because it is in -lpthread on IRIX
114 # while pthread_create is in libc. We check for pthread_attr_init
115 # due to DEC craziness with -lpthreads. We check for
116 # pthread_cleanup_push because it is one of the few pthread
117 # functions on Solaris that doesn't have a non-functional libc stub.
118 # We try pthread_create on general principles.
119 AC_TRY_LINK([#include <pthread.h>],
120 [pthread_t th; pthread_join(th, 0);
121 pthread_attr_init(0); pthread_cleanup_push(0, 0);
122 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
123 [acx_pthread_ok=yes])
124  
125 LIBS="$save_LIBS"
126 CFLAGS="$save_CFLAGS"
127  
128 AC_MSG_RESULT($acx_pthread_ok)
129 if test "x$acx_pthread_ok" = xyes; then
130 break;
131 fi
132  
133 PTHREAD_LIBS=""
134 PTHREAD_CFLAGS=""
135 done
136 fi
137  
138 # Various other checks:
139 if test "x$acx_pthread_ok" = xyes; then
140 save_LIBS="$LIBS"
141 LIBS="$PTHREAD_LIBS $LIBS"
142 save_CFLAGS="$CFLAGS"
143 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
144  
145 # Detect AIX lossage: threads are created detached by default
146 # and the JOINABLE attribute has a nonstandard name (UNDETACHED).
147 AC_MSG_CHECKING([for joinable pthread attribute])
148 AC_TRY_LINK([#include <pthread.h>],
149 [int attr=PTHREAD_CREATE_JOINABLE;],
150 ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
151 if test x"$ok" = xunknown; then
152 AC_TRY_LINK([#include <pthread.h>],
153 [int attr=PTHREAD_CREATE_UNDETACHED;],
154 ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
155 fi
156 if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
157 AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
158 [Define to the necessary symbol if this constant
159 uses a non-standard name on your system.])
160 fi
161 AC_MSG_RESULT(${ok})
162 if test x"$ok" = xunknown; then
163 AC_MSG_WARN([we do not know how to create joinable pthreads])
164 fi
165  
166 AC_MSG_CHECKING([if more special flags are required for pthreads])
167 flag=no
168 case "${host_cpu}-${host_os}" in
169 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
170 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
171 esac
172 AC_MSG_RESULT(${flag})
173 if test "x$flag" != xno; then
174 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
175 fi
176  
177 LIBS="$save_LIBS"
178 CFLAGS="$save_CFLAGS"
179  
180 # More AIX lossage: must compile with cc_r
181 AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
182 else
183 PTHREAD_CC="$CC"
184 fi
185  
186 AC_SUBST(PTHREAD_LIBS)
187 AC_SUBST(PTHREAD_CFLAGS)
188 AC_SUBST(PTHREAD_CC)
189  
190 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
191 if test x"$acx_pthread_ok" = xyes; then
192 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
193 :
194 else
195 acx_pthread_ok=no
196 $2
197 fi
198 AC_LANG_RESTORE
199 ])dnl ACX_PTHREAD