pthread: check for both pthread_create and pthread_join
[gnulib.git] / m4 / pthread.m4
1 # pthread.m4 serial 5
2 dnl Copyright (C) 2009-2012 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
6
7 AC_DEFUN([gl_PTHREAD_CHECK],
8 [
9    AC_REQUIRE([gl_PTHREAD_DEFAULTS])
10    gl_CHECK_NEXT_HEADERS([pthread.h])
11    if test $ac_cv_header_pthread_h = yes; then
12      HAVE_PTHREAD_H=1
13    else
14      HAVE_PTHREAD_H=0
15    fi
16
17    AC_CHECK_TYPES([pthread_t, pthread_spinlock_t], [], [],
18      [AC_INCLUDES_DEFAULT[
19       #if HAVE_PTHREAD_H
20        #include <pthread.h>
21       #endif]])
22    if test $ac_cv_type_pthread_t != yes; then
23      HAVE_PTHREAD_T=0
24    fi
25    if test $ac_cv_type_pthread_spinlock_t != yes; then
26      HAVE_PTHREAD_SPINLOCK_T=0
27    fi
28
29    if test $ac_cv_header_pthread_h != yes ||
30       test $ac_cv_type_pthread_t != yes ||
31       test $ac_cv_type_pthread_spinlock_t != yes; then
32      PTHREAD_H='pthread.h'
33    else
34      PTHREAD_H=
35    fi
36    AC_SUBST([PTHREAD_H])
37    AM_CONDITIONAL([GL_GENERATE_PTHREAD_H], [test -n "$PTHREAD_H"])
38
39    LIB_PTHREAD=
40    if test $ac_cv_header_pthread_h = yes; then
41      dnl We cannot use AC_SEARCH_LIBS here, because on OSF/1 5.1 pthread_join
42      dnl is defined as a macro which expands to __phread_join, and libpthread
43      dnl contains a definition for __phread_join but none for pthread_join.
44      dnl Also, FreeBSD 9 puts pthread_create in libpthread and pthread_join
45      dnl in libc, whereas on IRIX 6.5 the reverse is true; so check for both.
46      AC_CACHE_CHECK([for library containing pthread_create and pthread_join],
47        [gl_cv_lib_pthread],
48        [gl_saved_libs=$LIBS
49         gl_cv_lib_pthread=
50         for gl_lib_prefix in '' '-lpthread'; do
51           LIBS="$gl_lib_prefix $gl_saved_libs"
52           AC_LINK_IFELSE(
53             [AC_LANG_PROGRAM(
54                [[#include <pthread.h>
55                  void *noop (void *p) { return p; }]],
56                [[pthread_t pt;
57                  void *arg = 0;
58                  pthread_create (&pt, 0, noop, arg);
59                  pthread_join (pthread_self (), &arg);]])],
60             [if test -z "$gl_lib_prefix"; then
61                gl_cv_lib_pthread="none required"
62              else
63                gl_cv_lib_pthread=$gl_lib_prefix
64              fi])
65           test -n "$gl_cv_lib_pthread" && break
66         done
67         LIBS="$gl_saved_libs"
68        ])
69      if test "$gl_cv_lib_pthread" != "none required"; then
70        LIB_PTHREAD="$gl_cv_lib_pthread"
71      fi
72    fi
73    AC_SUBST([LIB_PTHREAD])
74
75    AC_REQUIRE([AC_C_INLINE])
76    AC_REQUIRE([AC_C_RESTRICT])
77 ])
78
79 AC_DEFUN([gl_PTHREAD_DEFAULTS],
80 [
81   dnl Assume proper GNU behavior unless another module says otherwise.
82   HAVE_PTHREAD_H=1;              AC_SUBST([HAVE_PTHREAD_H])
83   HAVE_PTHREAD_T=1;              AC_SUBST([HAVE_PTHREAD_T])
84   HAVE_PTHREAD_SPINLOCK_T=1;     AC_SUBST([HAVE_PTHREAD_SPINLOCK_T])
85 ])