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1 office 1 # lock.m4 serial 11 (gettext-0.18.2)
2 dnl Copyright (C) 2005-2011 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 dnl From Bruno Haible.
8  
9 AC_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_COMPILE_IFELSE([
22 AC_LANG_PROGRAM(
23 [[#include <pthread.h>]],
24 [[
25 #if __FreeBSD__ == 4
26 error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
27 #else
28 int x = (int)PTHREAD_MUTEX_RECURSIVE;
29 return !x;
30 #endif
31 ]])],
32 [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
33 [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
34 fi
35 gl_PREREQ_LOCK
36 ])
37  
38 # Prerequisites of lib/lock.c.
39 AC_DEFUN([gl_PREREQ_LOCK], [
40 AC_REQUIRE([AC_C_INLINE])
41 ])