?? pthread_spin_lock.c
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/* Copyright (C) 2002,2003,2004 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. */#include "pthreadP.h"#ifndef LOCK_PREFIX# ifdef UP# define LOCK_PREFIX /* nothing */# else# define LOCK_PREFIX "lock;"# endif#endifintpthread_spin_lock (lock) pthread_spinlock_t *lock;{ asm ("\n" "1:\t" LOCK_PREFIX "decl %0\n\t" "jne 2f\n\t" ".subsection 1\n\t" ".align 16\n" "2:\trep; nop\n\t" "cmpl $0, %0\n\t" "jg 1b\n\t" "jmp 2b\n\t" ".previous" : "=m" (*lock) : "m" (*lock)); return 0;}
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