| 1 | # unlocked-io.m4 serial 14
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| 2 |
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| 3 | # Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
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| 4 | # Free Software Foundation, Inc.
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| 5 | #
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| 6 | # This file is free software; the Free Software Foundation
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| 7 | # gives unlimited permission to copy and/or distribute it,
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| 8 | # with or without modifications, as long as this notice is preserved.
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| 9 |
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| 10 | dnl From Jim Meyering.
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| 11 | dnl
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| 12 | dnl See if the glibc *_unlocked I/O macros or functions are available.
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| 13 | dnl Use only those *_unlocked macros or functions that are declared
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| 14 | dnl (because some of them were declared in Solaris 2.5.1 but were removed
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| 15 | dnl in Solaris 2.6, whereas we want binaries built on Solaris 2.5.1 to run
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| 16 | dnl on Solaris 2.6).
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| 17 |
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| 18 | AC_DEFUN([gl_FUNC_GLIBC_UNLOCKED_IO],
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| 19 | [
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| 20 | AC_DEFINE([USE_UNLOCKED_IO], 1,
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| 21 | [Define to 1 if you want getc etc. to use unlocked I/O if available.
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| 22 | Unlocked I/O can improve performance in unithreaded apps,
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| 23 | but it is not safe for multithreaded apps.])
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| 24 |
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| 25 | dnl Persuade glibc and Solaris <stdio.h> to declare
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| 26 | dnl fgets_unlocked(), fputs_unlocked() etc.
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| 27 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 28 |
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| 29 | AC_CHECK_DECLS_ONCE([clearerr_unlocked])
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| 30 | AC_CHECK_DECLS_ONCE([feof_unlocked])
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| 31 | AC_CHECK_DECLS_ONCE([ferror_unlocked])
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| 32 | AC_CHECK_DECLS_ONCE([fflush_unlocked])
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| 33 | AC_CHECK_DECLS_ONCE([fgets_unlocked])
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| 34 | AC_CHECK_DECLS_ONCE([fputc_unlocked])
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| 35 | AC_CHECK_DECLS_ONCE([fputs_unlocked])
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| 36 | AC_CHECK_DECLS_ONCE([fread_unlocked])
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| 37 | AC_CHECK_DECLS_ONCE([fwrite_unlocked])
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| 38 | AC_CHECK_DECLS_ONCE([getc_unlocked])
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| 39 | AC_CHECK_DECLS_ONCE([getchar_unlocked])
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| 40 | AC_CHECK_DECLS_ONCE([putc_unlocked])
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| 41 | AC_CHECK_DECLS_ONCE([putchar_unlocked])
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| 42 | ])
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