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annotate m4/unlocked-io.m4 @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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f6cba5a556ce many *.m4 files: improve m4 quoting
Jim Meyering <meyering@redhat.com>
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1 # unlocked-io.m4 serial 15
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2
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b06060465f09 maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
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3 # Copyright (C) 1998-2006, 2009-2019 Free Software Foundation, Inc.
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4 #
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
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5 # This file is free software; the Free Software Foundation
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
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6 # gives unlimited permission to copy and/or distribute it,
87c42e194f4a Use an all-permissive copyright notice, recommended by RMS.
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7 # with or without modifications, as long as this notice is preserved.
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7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
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8
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
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9 dnl From Jim Meyering.
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
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10 dnl
7c1a6b73f48e An autoconf macro for its associated module.
Bruno Haible <bruno@clisp.org>
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11 dnl See if the glibc *_unlocked I/O macros or functions are available.
7c1a6b73f48e An autoconf macro for its associated module.
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12 dnl Use only those *_unlocked macros or functions that are declared
7c1a6b73f48e An autoconf macro for its associated module.
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13 dnl (because some of them were declared in Solaris 2.5.1 but were removed
7c1a6b73f48e An autoconf macro for its associated module.
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14 dnl in Solaris 2.6, whereas we want binaries built on Solaris 2.5.1 to run
7c1a6b73f48e An autoconf macro for its associated module.
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15 dnl on Solaris 2.6).
7c1a6b73f48e An autoconf macro for its associated module.
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16
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17 AC_DEFUN([gl_FUNC_GLIBC_UNLOCKED_IO],
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18 [
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19 AC_DEFINE([USE_UNLOCKED_IO], [1],
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20 [Define to 1 if you want getc etc. to use unlocked I/O if available.
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21 Unlocked I/O can improve performance in unithreaded apps,
7c24a825b51d Remove dependencies on unlocked-io.
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22 but it is not safe for multithreaded apps.])
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23
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24 dnl Persuade glibc and Solaris <stdio.h> to declare
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25 dnl fgets_unlocked(), fputs_unlocked() etc.
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26 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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28 AC_CHECK_DECLS_ONCE([clearerr_unlocked])
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29 AC_CHECK_DECLS_ONCE([feof_unlocked])
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30 AC_CHECK_DECLS_ONCE([ferror_unlocked])
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31 AC_CHECK_DECLS_ONCE([fflush_unlocked])
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32 AC_CHECK_DECLS_ONCE([fgets_unlocked])
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33 AC_CHECK_DECLS_ONCE([fputc_unlocked])
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34 AC_CHECK_DECLS_ONCE([fputs_unlocked])
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35 AC_CHECK_DECLS_ONCE([fread_unlocked])
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36 AC_CHECK_DECLS_ONCE([fwrite_unlocked])
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37 AC_CHECK_DECLS_ONCE([getc_unlocked])
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38 AC_CHECK_DECLS_ONCE([getchar_unlocked])
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39 AC_CHECK_DECLS_ONCE([putc_unlocked])
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40 AC_CHECK_DECLS_ONCE([putchar_unlocked])
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41 ])