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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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>
#include <lowlevellock.h>
#include <lowlevelcond.h>
#include <kernel-features.h>
#include <pthread-errnos.h>
#include "lowlevel-atomic.h"
.text
/* int pthread_cond_signal (pthread_cond_t *cond) */
.globl __pthread_cond_signal
.type __pthread_cond_signal, @function
.align 5
__pthread_cond_signal:
mov.l r8, @-r15
sts.l pr, @-r15
mov r4, r8
/* Get internal lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bf 1f
2:
mov.l @(total_seq+4,r8),r0
mov.l @(total_seq,r8),r1
mov.l @(wakeup_seq+4,r8), r2
cmp/hi r2, r0
bt 3f
cmp/hi r0, r2
bt 4f
mov.l @(wakeup_seq,r8), r2
cmp/hi r2, r1
bf 4f
3:
/* Bump the wakeup number. */
mov #1, r2
mov #0, r3
clrt
mov.l @(wakeup_seq,r8),r0
mov.l @(wakeup_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(wakeup_seq,r8)
mov.l r1,@(wakeup_seq+4,r8)
mov.l @(cond_futex,r8),r0
add r2, r0
mov.l r0,@(cond_futex,r8)
/* Wake up one thread. */
mov r8, r4
add #cond_futex, r4
mov #FUTEX_WAKE, r5
mov #1, r6
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
4:
/* Unlock. */
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 5f
6:
mov #0, r0
lds.l @r15+, pr
rts
mov.l @r15+, r8
1:
/* Initial locking failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov #LLL_SHARED, r6
extu.b r6, r6
mov.l .Lwait4, r1
bsrf r1
mov r2, r4
.Lwait4b:
bra 2b
nop
5:
/* Unlock in loop requires wakeup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov #LLL_SHARED, r5
mov.l .Lwake4, r1
bsrf r1
extu.b r5, r5
.Lwake4b:
bra 6b
nop
.align 2
.Lwait4:
.long __lll_lock_wait-.Lwait4b
.Lwake4:
.long __lll_unlock_wake-.Lwake4b
.size __pthread_cond_signal, .-__pthread_cond_signal
versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,
GLIBC_2_3_2)
|