glibc/nptl/sysdeps/unix/sysv/linux/i386/i486/libc-lowlevelmutex.S

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/* 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.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
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, %gs:MULTIPLE_THREADS_OFFSET; \
je,pt 0f; \
lock; \
0:
#endif
#include "lowlevelmutex.S"