From 0b3366f6a93ac0f7e2028745ea557c0acd8722c6 Mon Sep 17 00:00:00 2001 From: "\"Steven J. Hill\"" Date: Sat, 7 May 2005 02:04:55 +0000 Subject: Import in NPTL code from glibc. For further information please consult the 'README.NPTL' file. --- libpthread/nptl/sysdeps/i386/pthread_spin_lock.c | 49 ++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 libpthread/nptl/sysdeps/i386/pthread_spin_lock.c (limited to 'libpthread/nptl/sysdeps/i386/pthread_spin_lock.c') diff --git a/libpthread/nptl/sysdeps/i386/pthread_spin_lock.c b/libpthread/nptl/sysdeps/i386/pthread_spin_lock.c new file mode 100644 index 000000000..b41174e5f --- /dev/null +++ b/libpthread/nptl/sysdeps/i386/pthread_spin_lock.c @@ -0,0 +1,49 @@ +/* Copyright (C) 2002,2003,2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 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 +#endif + + +int +pthread_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; +} -- cgit v1.2.3