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- # unlocked-io.m4 serial 15
- # Copyright (C) 1998-2006, 2009 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
- dnl See if the glibc *_unlocked I/O macros or functions are available.
- dnl Use only those *_unlocked macros or functions that are declared
- dnl (because some of them were declared in Solaris 2.5.1 but were removed
- dnl in Solaris 2.6, whereas we want binaries built on Solaris 2.5.1 to run
- dnl on Solaris 2.6).
- 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])
- AC_CHECK_DECLS_ONCE([clearerr_unlocked])
- AC_CHECK_DECLS_ONCE([feof_unlocked])
- AC_CHECK_DECLS_ONCE([ferror_unlocked])
- AC_CHECK_DECLS_ONCE([fflush_unlocked])
- AC_CHECK_DECLS_ONCE([fgets_unlocked])
- AC_CHECK_DECLS_ONCE([fputc_unlocked])
- AC_CHECK_DECLS_ONCE([fputs_unlocked])
- AC_CHECK_DECLS_ONCE([fread_unlocked])
- AC_CHECK_DECLS_ONCE([fwrite_unlocked])
- AC_CHECK_DECLS_ONCE([getc_unlocked])
- AC_CHECK_DECLS_ONCE([getchar_unlocked])
- AC_CHECK_DECLS_ONCE([putc_unlocked])
- AC_CHECK_DECLS_ONCE([putchar_unlocked])
- ])
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