diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/i386/smp.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/i386/smp.h | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/smp.h b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/smp.h index 2c0cbe99a..f68a0c075 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/smp.h +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/smp.h @@ -1,5 +1,5 @@ -/* Determine whether the host has multiple processors. SH version. - Copyright (C) 2002 Free Software Foundation, Inc. +/* 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 @@ -17,8 +17,40 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <errno.h> +#include <fcntl.h> +#include <string.h> +#include <sys/utsname.h> +#include <not-cancel.h> + +/* 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) { - return 0; + 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; } |