1 files changed, 100 insertions, 0 deletions
diff --git a/m4/pthread.m4 b/m4/pthread.m4
new file mode 100644
index 0000000..6fb1c73
--- /dev/null
+++ b/m4/pthread.m4
@@ -0,0 +1,100 @@
+# pthread.m4 serial 10
+dnl Copyright (C) 2009-2018 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_PTHREAD_CHECK],
+[
+   AC_REQUIRE([gl_PTHREAD_DEFAULTS])
+   gl_CHECK_NEXT_HEADERS([pthread.h])
+   if test $ac_cv_header_pthread_h = yes; then
+     HAVE_PTHREAD_H=1
+     # mingw 3.0 uses winpthreads which installs broken macros via <pthread.h>
+     AC_CACHE_CHECK([whether <pthread.h> pollutes the namespace],
+      [gl_cv_header_pthread_h_pollution],
+      [AC_COMPILE_IFELSE(
+        [AC_LANG_PROGRAM(
+          [[#include <pthread.h>
+            #if defined strtok_r || defined localtime_r
+            #error
+             break me
+            #endif
+          ]])],
+        [gl_cv_header_pthread_h_pollution=no],
+        [gl_cv_header_pthread_h_pollution=yes])])
+   else
+     HAVE_PTHREAD_H=0
+   fi
+
+   AC_CHECK_TYPES([pthread_t, pthread_spinlock_t], [], [],
+     [AC_INCLUDES_DEFAULT[
+      #if HAVE_PTHREAD_H
+       #include <pthread.h>
+      #endif]])
+   if test $ac_cv_type_pthread_t != yes; then
+     HAVE_PTHREAD_T=0
+   fi
+   if test $ac_cv_type_pthread_spinlock_t != yes; then
+     HAVE_PTHREAD_SPINLOCK_T=0
+   fi
+
+   if test $ac_cv_header_pthread_h != yes ||
+      test $ac_cv_type_pthread_t != yes ||
+      test $ac_cv_type_pthread_spinlock_t != yes; then
+     PTHREAD_H='pthread.h'
+     AC_LIBOBJ([pthread])
+   elif test $gl_cv_header_pthread_h_pollution = yes; then
+     PTHREAD_H=pthread.h
+   else
+     PTHREAD_H=
+   fi
+   AC_SUBST([PTHREAD_H])
+   AM_CONDITIONAL([GL_GENERATE_PTHREAD_H], [test -n "$PTHREAD_H"])
+
+   LIB_PTHREAD=
+   if test $ac_cv_header_pthread_h = yes; then
+     dnl We cannot use AC_SEARCH_LIBS here, because on OSF/1 5.1 pthread_join
+     dnl is defined as a macro which expands to __phread_join, and libpthread
+     dnl contains a definition for __phread_join but none for pthread_join.
+     dnl Also, FreeBSD 9 puts pthread_create in libpthread and pthread_join
+     dnl in libc, whereas on IRIX 6.5 the reverse is true; so check for both.
+     AC_CACHE_CHECK([for library containing pthread_create and pthread_join],
+       [gl_cv_lib_pthread],
+       [gl_saved_libs=$LIBS
+        gl_cv_lib_pthread=
+        for gl_lib_prefix in '' '-pthread' '-lpthread'; do
+          LIBS="$gl_lib_prefix $gl_saved_libs"
+          AC_LINK_IFELSE(
+            [AC_LANG_PROGRAM(
+               [[#include <pthread.h>
+                 void *noop (void *p) { return p; }]],
+               [[pthread_t pt;
+                 void *arg = 0;
+                 pthread_create (&pt, 0, noop, arg);
+                 pthread_join (pthread_self (), &arg);]])],
+            [if test -z "$gl_lib_prefix"; then
+               gl_cv_lib_pthread="none required"
+             else
+               gl_cv_lib_pthread=$gl_lib_prefix
+             fi])
+          test -n "$gl_cv_lib_pthread" && break
+        done
+        LIBS="$gl_saved_libs"
+       ])
+     if test "$gl_cv_lib_pthread" != "none required"; then
+       LIB_PTHREAD="$gl_cv_lib_pthread"
+     fi
+   fi
+   AC_SUBST([LIB_PTHREAD])
+
+   AC_REQUIRE([AC_C_RESTRICT])
+])
+
+AC_DEFUN([gl_PTHREAD_DEFAULTS],
+[
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_PTHREAD_H=1;              AC_SUBST([HAVE_PTHREAD_H])
+  HAVE_PTHREAD_T=1;              AC_SUBST([HAVE_PTHREAD_T])
+  HAVE_PTHREAD_SPINLOCK_T=1;     AC_SUBST([HAVE_PTHREAD_SPINLOCK_T])
+])