| /* Copyright (C) 2002-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <pthread-errnos.h> |
| |
| |
| #ifdef UP |
| # define LOCK |
| #else |
| # define LOCK lock |
| #endif |
| |
| .globl pthread_spin_trylock |
| .type pthread_spin_trylock,@function |
| .align 16 |
| pthread_spin_trylock: |
| movl 4(%esp), %edx |
| movl $1, %eax |
| xorl %ecx, %ecx |
| LOCK |
| cmpxchgl %ecx, (%edx) |
| movl $EBUSY, %eax |
| #ifdef HAVE_CMOV |
| cmovel %ecx, %eax |
| #else |
| jne 0f |
| movl %ecx, %eax |
| 0: |
| #endif |
| ret |
| .size pthread_spin_trylock,.-pthread_spin_trylock |
