1# lock.m4 serial 10 (gettext-0.18)
2dnl Copyright (C) 2005-2010 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 MacOS 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_TRY_COMPILE([#include <pthread.h>],
22      [#if __FreeBSD__ == 4
23error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
24#else
25int x = (int)PTHREAD_MUTEX_RECURSIVE;
26return !x;
27#endif],
28      [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
29         [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
30  fi
31  gl_PREREQ_LOCK
32])
33
34# Prerequisites of lib/lock.c.
35AC_DEFUN([gl_PREREQ_LOCK], [
36  AC_REQUIRE([AC_C_INLINE])
37])
38