projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| db5f2fc9 UD |
1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
| 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> | |
| 22 | ||
| 23 | #ifndef UP | |
| 24 | # define LOCK lock | |
| 25 | #else | |
| 26 | # define | |
| 27 | #endif | |
| 28 | ||
| 29 | #define SYS_futex 202 | |
| 30 | ||
| 31 | #define EWOULDBLOCK 11 | |
| 32 | ||
| 33 | ||
| 34 | .text | |
| 35 | ||
| 36 | .globl __new_sem_wait | |
| 37 | .type __new_sem_wait,@function | |
| 38 | .align 16 | |
| 39 | __new_sem_wait: | |
| 40 | 3: movl (%rdi), %eax | |
| 41 | 2: testl %eax, %eax | |
| 42 | je 1f | |
| 43 | ||
| 5a03acfe | 44 | leaq -1(%rax), %rdx |
| db5f2fc9 UD |
45 | LOCK |
| 46 | cmpxchgl %edx, (%rdi) | |
| 47 | jne 2b | |
| 48 | xorl %eax, %eax | |
| 49 | ||
| 50 | retq | |
| 51 | ||
| 52 | 1: xorq %r10, %r10 | |
| 53 | movq $SYS_futex, %rax | |
| 54 | movq %r10, %rsi | |
| 55 | movq %r10, %rdx | |
| 56 | syscall | |
| 57 | ||
| 58 | testq %rax, %rax | |
| 59 | je 3b | |
| 60 | cmpq $-EWOULDBLOCK, %rax | |
| 61 | je 3b | |
| 62 | negq %rax | |
| 63 | #if USE___THREAD | |
| 64 | movq errno@gottpoff(%rip), %rdx | |
| 65 | movl %eax, %fs:(%rdx) | |
| 66 | #else | |
| 67 | movl %eax, %edx | |
| 6c477888 | 68 | callq __errno_location@plt |
| db5f2fc9 UD |
69 | movl %edx, (%rax) |
| 70 | #endif | |
| 71 | orl $-1, %eax | |
| 72 | retq | |
| 73 | .size __new_sem_wait,.-__new_sem_wait | |
| 74 | .symver __new_sem_wait, sem_wait@@GLIBC_2.1 | |
| 75 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) | |
| 76 | .global __old_sem_wait | |
| 77 | __old_sem_wait = __new_sem_wait | |
| 78 | .symver __old_sem_wait, sem_wait@GLIBC_2.0 | |
| 79 | #endif |