projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0ecb606c | 1 | /* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc. |
| db5f2fc9 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 | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | #include <shlib-compat.h> | |
| 326132db | 22 | #include <pthread-errnos.h> |
| db5f2fc9 UD |
23 | |
| 24 | #ifndef UP | |
| 25 | # define LOCK lock | |
| 26 | #else | |
| 27 | # define | |
| 28 | #endif | |
| 29 | ||
| db5f2fc9 UD |
30 | .text |
| 31 | ||
| 7588880f UD |
32 | .globl sem_trywait |
| 33 | .type sem_trywait,@function | |
| db5f2fc9 | 34 | .align 16 |
| 7588880f | 35 | sem_trywait: |
| db5f2fc9 UD |
36 | movl (%rdi), %eax |
| 37 | 2: testl %eax, %eax | |
| 38 | jz 1f | |
| 39 | ||
| 5a03acfe | 40 | leaq -1(%rax), %rdx |
| db5f2fc9 UD |
41 | LOCK |
| 42 | cmpxchgl %edx, (%rdi) | |
| 43 | jne 2b | |
| 44 | ||
| 45 | xorl %eax, %eax | |
| 46 | retq | |
| 47 | ||
| 48 | 1: | |
| 49 | #if USE___THREAD | |
| 50 | movq errno@gottpoff(%rip), %rdx | |
| 51 | movl $EAGAIN, %fs:(%rdx) | |
| 52 | #else | |
| 6c477888 | 53 | callq __errno_location@plt |
| db5f2fc9 UD |
54 | movl $EAGAIN, (%rax) |
| 55 | #endif | |
| 56 | orl $-1, %eax | |
| 57 | retq | |
| 7588880f | 58 | .size sem_trywait,.-sem_trywait |