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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
|
/* Copyright (C) 2002 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>
.text
#ifdef UP
# define LOCK
#else
# define LOCK lock
#endif
#define SYS_gettimeofday __NR_gettimeofday
#define SYS_futex 240
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define EWOULDBLOCK 11
#define EINVAL 22
#define ETIMEDOUT 110
#define cond_lock 0
#define cond_nr_wakers 4
#define cond_nr_sleepers 8
.global __lll_cond_wait
.type __lll_cond_wait,@function
.hidden __lll_cond_wait
.align 16
__lll_cond_wait:
pushl %esi
pushl %ebx
xorl %esi, %esi
leal cond_nr_wakers(%eax), %ebx
4: movl (%ebx), %edx
testl %edx, %edx
jne 1f
LOCK
decl cond_lock-cond_nr_wakers(%ebx)
jne 2f
3: xorl %ecx, %ecx
movl $SYS_futex, %eax
int $0x80
movl $1, %eax
LOCK
xaddl %eax, cond_lock-cond_nr_wakers(%ebx)
testl %eax, %eax
je 4b
leal cond_lock-cond_nr_wakers(%ebx), %ecx
/* Preserves %ebx, %edx, %edi, %esi. */
call __lll_mutex_lock_wait
jmp 4b
1: decl (%ebx)
popl %ebx
popl %esi
ret
2: leal cond_lock-cond_nr_wakers(%ebx), %eax
/* Preserves %ebx, %ecx, %edx, %edi, %esi. */
call __lll_mutex_unlock_wake
jmp 3b
.size __lll_cond_wait,.-__lll_cond_wait
.global __lll_cond_timedwait
.type __lll_cond_timedwait,@function
.hidden __lll_cond_timedwait
.align 16
__lll_cond_timedwait:
/* Check for a valid timeout value. */
cmpl $1000000000, 4(%edx)
jae 1f
pushl %ebp
pushl %edi
pushl %esi
pushl %ebx
/* Stack frame for the timespec and timeval structs. */
subl $8, %esp
leal cond_nr_wakers(%eax), %ebp /* cond */
movl %edx, %edi /* timeout */
9: movl (%ebp), %esi
testl %esi, %esi
jne 5f
LOCK
decl cond_lock-cond_nr_wakers(%ebp)
jne 6f
/* Get current time. */
7: movl %esp, %ebx
xorl %ecx, %ecx
movl $SYS_gettimeofday, %eax
int $0x80
/* Compute relative timeout. */
movl 4(%esp), %eax
movl $1000, %edx
mul %edx /* Milli seconds to nano seconds. */
movl (%edi), %ecx
movl 4(%edi), %edx
subl (%esp), %ecx
subl %eax, %edx
jns 3f
addl $1000000000, %edx
decl %ecx
3: testl %ecx, %ecx
js 4f /* Time is already up. */
movl %ecx, (%esp) /* Store relative timeout. */
movl %edx, 4(%esp)
movl %esi, %edx
movl %esp, %esi
xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */
movl %ebp, %ebx
movl $SYS_futex, %eax
int $0x80
movl %eax, %edx
movl $1, %eax
LOCK
xaddl %eax, cond_lock-cond_nr_wakers(%ebp)
testl %eax, %eax
jne 8f
cmpl $-ETIMEDOUT, %edx
jne 9b
4: movl $ETIMEDOUT, %eax
jmp 2f
5: decl (%ebp)
xorl %eax, %eax
2: addl $8, %esp
popl %ebx
popl %esi
popl %edi
popl %ebp
ret
6: leal cond_lock-cond_nr_wakers(%ebp), %eax
/* Preserves %ebx, %ecx, %edx, %edi, %esi. */
call __lll_mutex_unlock_wake
jmp 7b
8: leal cond_lock-cond_nr_wakers(%ebp), %ecx
/* Preserves %ebx, %edx, %edi, %esi. */
call __lll_mutex_lock_wait
jmp 5b
1: movl $EINVAL, %eax
ret
.size __lll_cond_timedwait,.-__lll_cond_timedwait
.global __lll_cond_wake
.type __lll_cond_wake,@function
.hidden __lll_cond_wake
.align 16
__lll_cond_wake:
pushl %esi
pushl %ebx
movl %eax, %ebx
movl $1, %eax
LOCK
xaddl %eax, (%ebx)
testl %eax, %eax
jne 1f
2: leal cond_nr_wakers(%ebx), %ebx
cmpl $0, cond_nr_sleepers-cond_nr_wakers(%ebx)
je 3f
incl (%ebx)
jz 5f
6: movl $FUTEX_WAKE, %ecx
xorl %esi, %esi
movl %ecx, %edx /* movl $1, %edx */
movl $SYS_futex, %eax
int $0x80
3: LOCK
decl cond_lock-cond_nr_wakers(%ebx)
je,pt 4f
leal cond_lock-cond_nr_wakers(%ebx), %eax
call __lll_mutex_unlock_wake
4: popl %ebx
popl %esi
ret
1: movl %ebx, %ecx
call __lll_mutex_lock_wait
jmp 2b
5: movl $0x80000000, (%ebx)
jmp 6b
.size __lll_cond_wake,.-__lll_cond_wake
.global __lll_cond_broadcast
.type __lll_cond_broadcast,@function
.hidden __lll_cond_broadcast
.align 16
__lll_cond_broadcast:
pushl %esi
pushl %ebx
movl %eax, %ebx
movl $0x8000000, %edx
movl $1, %eax
LOCK
xaddl %eax, (%ebx)
testl %eax, %eax
jne 1f
2: leal cond_nr_wakers(%ebx), %ebx
cmpl $0, cond_nr_sleepers-cond_nr_wakers(%ebx)
je 3f
orl %edx, (%ebx)
6: movl $FUTEX_WAKE, %ecx
xorl %esi, %esi
movl $SYS_futex, %eax
int $0x80
3: LOCK
decl cond_lock-cond_nr_wakers(%ebx)
je,pt 4f
leal cond_lock-cond_nr_wakers(%ebx), %eax
call __lll_mutex_unlock_wake
4: popl %ebx
popl %esi
ret
1: movl %ebx, %ecx
call __lll_mutex_lock_wait
jmp 2b
.size __lll_cond_broadcast,.-__lll_cond_broadcast
|