projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 2002-2019 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 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| 5a03acfe | 18 | |
| 326132db | 19 | #include <pthread-errnos.h> |
| b2741302 | 20 | #include <sysdep.h> |
| 5a03acfe UD |
21 | |
| 22 | ||
| 23 | #ifdef UP | |
| 24 | # define LOCK | |
| 25 | #else | |
| 26 | # define LOCK lock | |
| 27 | #endif | |
| 28 | ||
| b2741302 | 29 | ENTRY(pthread_spin_trylock) |
| 5a03acfe UD |
30 | movl $1, %eax |
| 31 | xorl %ecx, %ecx | |
| 32 | LOCK | |
| 33 | cmpxchgl %ecx, (%rdi) | |
| 34 | movl $EBUSY, %eax | |
| 35 | cmovel %ecx, %eax | |
| 36 | retq | |
| b2741302 | 37 | END(pthread_spin_trylock) |