1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/* Copyright (C) 2002, 2003 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <shlib-compat.h>
#ifndef UP
# define LOCK lock
#else
# define
#endif
#define SYS_futex 202
#define EWOULDBLOCK 11
.text
.globl __new_sem_wait
.type __new_sem_wait,@function
.align 16
__new_sem_wait:
3: movl (%rdi), %eax
2: testl %eax, %eax
je 1f
leaq -1(%rax), %rdx
LOCK
cmpxchgl %edx, (%rdi)
jne 2b
xorl %eax, %eax
retq
1: xorq %r10, %r10
movq $SYS_futex, %rax
movq %r10, %rsi
movq %r10, %rdx
syscall
testq %rax, %rax
je 3b
cmpq $-EWOULDBLOCK, %rax
je 3b
negq %rax
#if USE___THREAD
movq errno@gottpoff(%rip), %rdx
movl %eax, %fs:(%rdx)
#else
movl %eax, %edx
callq __errno_location@plt
movl %edx, (%rax)
#endif
orl $-1, %eax
retq
.size __new_sem_wait,.-__new_sem_wait
.symver __new_sem_wait, sem_wait@@GLIBC_2.1
#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
.global __old_sem_wait
__old_sem_wait = __new_sem_wait
.symver __old_sem_wait, sem_wait@GLIBC_2.0
#endif
|
