1# lock.m4 serial 13 (gettext-0.18.2)
2dnl Copyright (C) 2005-2014 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
9AC_DEFUN([gl_LOCK],
10[
11  AC_REQUIRE([gl_THREADLIB])
12  if test "$gl_threads_api" = posix; then
13    # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the
14    # pthread_rwlock_* functions.
15    AC_CHECK_TYPE([pthread_rwlock_t],
16      [AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],
17         [Define if the POSIX multithreading library has read/write locks.])],
18      [],
19      [#include <pthread.h>])
20    # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
21    AC_COMPILE_IFELSE([
22      AC_LANG_PROGRAM(
23        [[#include <pthread.h>]],
24        [[
25#if __FreeBSD__ == 4
26error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
27#elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \
28       && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
29error "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
30#else
31int x = (int)PTHREAD_MUTEX_RECURSIVE;
32return !x;
33#endif
34        ]])],
35      [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
36         [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
37  fi
38  gl_PREREQ_LOCK
39])
40
41# Prerequisites of lib/glthread/lock.c.
42AC_DEFUN([gl_PREREQ_LOCK], [:])
43