| /* 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 <sysdep.h> |
| #include <lowlevellock.h> |
| #include <shlib-compat.h> |
| #include <pthread-errnos.h> |
| |
| .text |
| |
| .globl sem_trywait |
| .type sem_trywait,@function |
| .align 16 |
| sem_trywait: |
| movl (%rdi), %eax |
| 2: testl %eax, %eax |
| jz 1f |
| |
| leal -1(%rax), %edx |
| LOCK |
| cmpxchgl %edx, (%rdi) |
| jne 2b |
| |
| xorl %eax, %eax |
| retq |
| |
| 1: |
| movq errno@gottpoff(%rip), %rdx |
| movl $EAGAIN, %fs:(%rdx) |
| orl $-1, %eax |
| retq |
| .size sem_trywait,.-sem_trywait |
