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41 lines
1.5 KiB
41 lines
1.5 KiB
# unlocked-io.m4 serial 15 |
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# Copyright (C) 1998-2006, 2009-2017 Free Software Foundation, Inc. |
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# |
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# This file is free software; the Free Software Foundation |
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# gives unlimited permission to copy and/or distribute it, |
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# with or without modifications, as long as this notice is preserved. |
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dnl From Jim Meyering. |
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dnl |
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dnl See if the glibc *_unlocked I/O macros or functions are available. |
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dnl Use only those *_unlocked macros or functions that are declared |
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dnl (because some of them were declared in Solaris 2.5.1 but were removed |
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dnl in Solaris 2.6, whereas we want binaries built on Solaris 2.5.1 to run |
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dnl on Solaris 2.6). |
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AC_DEFUN([gl_FUNC_GLIBC_UNLOCKED_IO], |
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[ |
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AC_DEFINE([USE_UNLOCKED_IO], [1], |
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[Define to 1 if you want getc etc. to use unlocked I/O if available. |
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Unlocked I/O can improve performance in unithreaded apps, |
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but it is not safe for multithreaded apps.]) |
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dnl Persuade glibc and Solaris <stdio.h> to declare |
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dnl fgets_unlocked(), fputs_unlocked() etc. |
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
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AC_CHECK_DECLS_ONCE([clearerr_unlocked]) |
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AC_CHECK_DECLS_ONCE([feof_unlocked]) |
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AC_CHECK_DECLS_ONCE([ferror_unlocked]) |
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AC_CHECK_DECLS_ONCE([fflush_unlocked]) |
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AC_CHECK_DECLS_ONCE([fgets_unlocked]) |
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AC_CHECK_DECLS_ONCE([fputc_unlocked]) |
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AC_CHECK_DECLS_ONCE([fputs_unlocked]) |
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AC_CHECK_DECLS_ONCE([fread_unlocked]) |
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AC_CHECK_DECLS_ONCE([fwrite_unlocked]) |
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AC_CHECK_DECLS_ONCE([getc_unlocked]) |
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AC_CHECK_DECLS_ONCE([getchar_unlocked]) |
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AC_CHECK_DECLS_ONCE([putc_unlocked]) |
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AC_CHECK_DECLS_ONCE([putchar_unlocked]) |
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])
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