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m4/lock.m4

 

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# lock.m4 serial 11 (gettext-0.18.2)

 

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dnl Copyright (C) 2005-2012 Free Software Foundation, Inc.

 

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dnl This file is free software; the Free Software Foundation

 

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dnl gives unlimited permission to copy and/or distribute it,

 

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dnl with or without modifications, as long as this notice is preserved.

 

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dnl From Bruno Haible.

 

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AC_DEFUN([gl_LOCK],

 

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[

 

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  AC_REQUIRE([gl_THREADLIB])

 

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  if test "$gl_threads_api" = posix; then

 

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    # OSF/1 4.0 and MacOS X 10.1 lack the pthread_rwlock_t type and the

 

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    # pthread_rwlock_* functions.

 

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    AC_CHECK_TYPE([pthread_rwlock_t],

 

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      [AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],

 

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         [Define if the POSIX multithreading library has read/write locks.])],

 

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      [],

 

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      [#include <pthread.h>])

 

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    # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.

 

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    AC_COMPILE_IFELSE([

 

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      AC_LANG_PROGRAM(

 

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        [[#include <pthread.h>]],

 

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        [[

 

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#if __FreeBSD__ == 4

 

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error "No, in FreeBSD 4.0 recursive mutexes actually don't work."

 

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#else

 

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int x = (int)PTHREAD_MUTEX_RECURSIVE;

 

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return !x;

 

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#endif

 

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        ]])],

 

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      [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],

 

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         [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])

 

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  fi

 

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  gl_PREREQ_LOCK

 

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])

 

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# Prerequisites of lib/lock.c.

 

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AC_DEFUN([gl_PREREQ_LOCK], [

 

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  AC_REQUIRE([AC_C_INLINE])

 

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])

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