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authorSergey Poznyakoff <gray@gnu.org.ua>2005-02-24 12:18:40 +0000
committerSergey Poznyakoff <gray@gnu.org.ua>2005-02-24 12:18:40 +0000
commit8ea093c83ec0eecbe9d5ffce741d3ec3e27fad83 (patch)
treec452da6b6ae47962743478dd8367048582ab4d8b /m4
parent975038c912b76c56c552ae51bac8a36f0c3bd160 (diff)
downloadmailutils-8ea093c83ec0eecbe9d5ffce741d3ec3e27fad83.tar.gz
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Diffstat (limited to 'm4')
-rw-r--r--m4/unlocked-io.m434
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diff --git a/m4/unlocked-io.m4 b/m4/unlocked-io.m4
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+# 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
+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 feof_unlocked ferror_unlocked
+ fflush_unlocked fgets_unlocked fputc_unlocked fputs_unlocked
+ fread_unlocked fwrite_unlocked getc_unlocked
+ getchar_unlocked putc_unlocked putchar_unlocked])
+])

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