| /* Copyright (C) 2003 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. |
| |
| 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 <errno.h> |
| #include "pthreadP.h" |
| |
| int |
| pthread_spin_trylock (lock) |
| pthread_spinlock_t *lock; |
| { |
| unsigned int old; |
| int err = EBUSY; |
| |
| asm ("1: lwarx %0,0,%2\n" |
| " cmpwi 0,%0,0\n" |
| " bne 2f\n" |
| " stwcx. %3,0,%2\n" |
| " bne- 1b\n" |
| " li %1,0\n" |
| " isync\n" |
| "2: " |
| : "=&r" (old), "=&r" (err) |
| : "r" (lock), "r" (1), "1" (err) |
| : "cr0", "memory"); |
| |
| return err; |
| } |
