diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S index 830f628578..88885b735d 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -17,19 +17,14 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#include <kernel-features.h> - -/* All locks in libc are private. Use the kernel feature if possible. */ -#define FUTEX_PRIVATE_FLAG 128 -#ifdef __ASSUME_PRIVATE_FUTEX -# define FUTEX_WAIT (0 | FUTEX_PRIVATE_FLAG) -# define FUTEX_WAKE (1 | FUTEX_PRIVATE_FLAG) -#else -# define LOAD_FUTEX_WAIT(reg) \ - movl %gs:PRIVATE_FUTEX, reg -# define LOAD_FUTEX_WAKE(reg) \ - movl %gs:PRIVATE_FUTEX, reg ; \ - orl $FUTEX_WAKE, reg +/* In libc.so we do not unconditionally use the lock prefix. Only if + the application is using threads. */ +#ifndef UP +# define LOCK \ + cmpl $0, %gs:MULTIPLE_THREADS_OFFSET; \ + je 0f; \ + lock; \ +0: #endif #include "lowlevellock.S" |