-#serial 9
+# unlocked-io.m4 serial 11
+
+# Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
+# Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
dnl From Jim Meyering.
dnl
AC_DEFUN([gl_FUNC_GLIBC_UNLOCKED_IO],
[
+ AC_DEFINE([USE_UNLOCKED_IO], 1,
+ [Define to 1 if you want getc etc. to use unlocked I/O if available.
+ Unlocked I/O can improve performance in unithreaded apps,
+ but it is not safe for multithreaded apps.])
+
dnl Persuade glibc and Solaris <stdio.h> to declare
dnl fgets_unlocked(), fputs_unlocked() etc.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])