diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2007-07-31 17:46:17 +0000 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2007-07-31 17:46:17 +0000 |
| commit | 8833066b122427710a9e14a888ce6cfa862332d3 (patch) | |
| tree | 29591019d695919417b3698618d6a342e97381d6 /nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S | |
| parent | fedca46896bdb702cb988837a0c2c5447e72ba2b (diff) | |
Updated to fedora-glibc-20070731T1624cvs/fedora-glibc-2_6_90-1
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S index 3621efa4fc..3265eee0ed 100644 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. +/* Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -17,14 +17,19 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -/* In libc.so we do not unconditionally use the lock prefix. Only if - the application is using threads. */ -#ifndef UP -# define LOCK \ - cmpl $0, __libc_multiple_threads(%rip); \ - je 0f; \ - lock; \ -0: +#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 %fs:PRIVATE_FUTEX, reg +# define LOAD_FUTEX_WAKE(reg) \ + movl %fs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAKE, reg #endif #include "lowlevellock.S" |