diff options
Diffstat (limited to 'm4/unlocked-io.m4')
| -rw-r--r-- | m4/unlocked-io.m4 | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/m4/unlocked-io.m4 b/m4/unlocked-io.m4 new file mode 100644 index 00000000000..448ccac2f0e --- /dev/null +++ b/m4/unlocked-io.m4 @@ -0,0 +1,41 @@ +# unlocked-io.m4 serial 15 + +# Copyright (C) 1998-2006, 2009-2017 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]) +]) |