projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d4697bc9 | 1 | /* Copyright (C) 2002-2014 Free Software Foundation, Inc. |
| 5a03acfe UD |
2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 5a03acfe | 18 | |
| 326132db | 19 | #include <pthread-errnos.h> |
| 5a03acfe UD |
20 | |
| 21 | ||
| 22 | #ifdef UP | |
| 23 | # define LOCK | |
| 24 | #else | |
| 25 | # define LOCK lock | |
| 26 | #endif | |
| 27 | ||
| 28 | .globl pthread_spin_trylock | |
| 29 | .type pthread_spin_trylock,@function | |
| 30 | .align 16 | |
| 31 | pthread_spin_trylock: | |
| 32 | movl $1, %eax | |
| 33 | xorl %ecx, %ecx | |
| 34 | LOCK | |
| 35 | cmpxchgl %ecx, (%rdi) | |
| 36 | movl $EBUSY, %eax | |
| 37 | cmovel %ecx, %eax | |
| 38 | retq | |
| 39 | .size pthread_spin_trylock,.-pthread_spin_trylock |