From 0ecb606cb6cf65de1d9fc8a919bceb4be476c602 Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Thu, 12 Jul 2007 18:26:36 +0000 Subject: 2.5-18.1 --- nptl/sysdeps/unix/sysv/linux/i386/smp.h | 56 +++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 nptl/sysdeps/unix/sysv/linux/i386/smp.h (limited to 'nptl/sysdeps/unix/sysv/linux/i386/smp.h') diff --git a/nptl/sysdeps/unix/sysv/linux/i386/smp.h b/nptl/sysdeps/unix/sysv/linux/i386/smp.h new file mode 100644 index 0000000000..f68a0c0758 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/i386/smp.h @@ -0,0 +1,56 @@ +/* Determine whether the host has multiple processors. Linux version. + Copyright (C) 1996, 2002, 2004, 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include +#include +#include +#include +#include + +/* Test whether the machine has more than one processor. This is not the + best test but good enough. More complicated tests would require `malloc' + which is not available at that time. */ +static inline int +is_smp_system (void) +{ + union + { + struct utsname uts; + char buf[512]; + } u; + char *cp; + + /* Try reading the number using `sysctl' first. */ + if (uname (&u.uts) == 0) + cp = u.uts.version; + else + { + /* This was not successful. Now try reading the /proc filesystem. */ + int fd = open_not_cancel_2 ("/proc/sys/kernel/version", O_RDONLY); + if (__builtin_expect (fd, 0) == -1 + || read_not_cancel (fd, u.buf, sizeof (u.buf)) <= 0) + /* This also didn't work. We give up and say it's a UP machine. */ + u.buf[0] = '\0'; + + close_not_cancel_no_status (fd); + cp = u.buf; + } + + return strstr (cp, "SMP") != NULL; +} -- cgit 1.4.1