gnulib/import/m4/lock.m4

   1 # lock.m4 serial 13 (gettext-0.18.2)
   2 dnl Copyright (C) 2005-2016 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 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
  26 error "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)
  29 error "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
  30 #else
  31 int x = (int)PTHREAD_MUTEX_RECURSIVE;
  32 return !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.
  42 AC_DEFUN([gl_PREREQ_LOCK], [:])