summaryrefslogtreecommitdiff
path: root/libpthread/nptl/sysdeps/unix/sysv/linux/sh/pthread_cond_broadcast.S
blob: 0884c1381be791bf2bad6e0d6d7652dd127c637c (plain)
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
/* Copyright (C) 2003, 2004, 2006, 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 <lowlevellock.h>
#include <lowlevelcond.h>
#include <bits/kernel-features.h>
#include <pthread-pi-defines.h>
#include <pthread-errnos.h>
#include <tcb-offsets.h>
#include "lowlevel-atomic.h"

	.text

	/* int pthread_cond_broadcast (pthread_cond_t *cond) */
	.globl	__pthread_cond_broadcast
	.type	__pthread_cond_broadcast, @function
	.hidden	__pthread_cond_broadcast
	.align	5
__pthread_cond_broadcast:
	mov.l   r10, @-r15
	mov.l   r9, @-r15
	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:
	/* Cause all currently waiting threads to recognize they are
	   woken up.  */
	mov.l	r1, @(wakeup_seq,r8)
	mov.l	r0, @(wakeup_seq+4,r8)
	mov.l	r1, @(woken_seq,r8)
	mov.l	r0, @(woken_seq+4,r8)
	mov.l	@(broadcast_seq,r8), r2
	add	#1, r2
	mov.l	r2, @(broadcast_seq,r8)
	add	r1, r1
	mov	r1, r10
	mov.l	r10, @(cond_futex,r8)

	/* Get the address of the mutex used.  */
	mov.l	@(dep_mutex,r8), r9

	/* Unlock.  */
#if cond_lock != 0
	DEC (@(cond_lock,r8), r2)
#else
	DEC (@r8, r2)
#endif
	tst	r2, r2
	bf	7f

8:
	/* Don't use requeue for pshared condvars.  */
	mov	#-1, r0
	cmp/eq	r0, r9
	mov	r8, r4
	bt/s	9f
	 add	#cond_futex, r4

	/* XXX: The kernel only supports FUTEX_CMP_REQUEUE to the same
	   type of futex (private resp. shared).  */
	mov.l	@(MUTEX_KIND,r9), r0
	tst	#(PI_BIT|PS_BIT), r0
	bf	9f

	/* Wake up all threads.  */
#ifdef __ASSUME_PRIVATE_FUTEX
	mov	#(FUTEX_CMP_REQUEUE|FUTEX_PRIVATE_FLAG), r5
	extu.b	r5, r5
#else
	stc	gbr, r1
	mov.w	.Lpfoff, r2
	add	r2, r1
	mov.l	@r1, r5
	mov	#FUTEX_CMP_REQUEUE, r0
	or	r0, r5
#endif
	mov	#1, r6
	mov	#-1, r7
	shlr	r7		/* r7 = 0x7fffffff */
	mov	r9, r0
# if MUTEX_FUTEX != 0
	add	#MUTEX_FUTEX, r0
# endif
	mov	r10, r1
	mov	#SYS_futex, r3
	extu.b	r3, r3
	trapa	#0x16
	SYSCALL_INST_PAD

	/* For any kind of error, which mainly is EAGAIN, we try again
	   with WAKE.  The general test also covers running on old
	   kernels.  */
	mov	r0, r1
	mov	#-12, r2
	shad	r2, r1
	not	r1, r1
	tst	r1, r1
	mov	r8, r4
	bt/s	9f
	 add	#cond_futex, r4

10:
	mov	#0, r0
	lds.l	@r15+, pr
	mov.l	@r15+, r8
	mov.l	@r15+, r9
	rts
	 mov.l	@r15+, r10

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
	mov.l	@r15+, r8
	mov.l	@r15+, r9
	rts
	 mov.l	@r15+, r10

1:
	/* Initial locking failed.  */
	mov	r8, r5
#if cond_lock != 0
	add	#cond_lock, r5
#endif
	mov.l	@(dep_mutex,r8), r0
	cmp/eq	#-1, r0
	bf/s	99f
	 mov	#LLL_PRIVATE, r6
	mov	#LLL_SHARED, r6
99:
	extu.b	r6, r6
	mov.l	.Lwait5, r1
	bsrf	r1
	 mov	r2, r4
.Lwait5b:
	bra	2b
	 nop

5:
	/* Unlock in loop requires wakeup.  */
	mov	r8, r4
#if cond_lock != 0
	add	#cond_lock, r4
#endif
	mov.l	@(dep_mutex,r8), r0
	cmp/eq	#-1, r0
	bf/s	99f
	 mov	#LLL_PRIVATE, r5
	mov	#LLL_SHARED, r5
99:
	mov.l	.Lwake5, r1
	bsrf	r1
	 extu.b	r5, r5
.Lwake5b:
	bra	6b
	 nop

7:
	/* Unlock in loop requires wakeup.  */
	mov	r8, r4
#if cond_lock != 0
	add	#cond_lock, r4
#endif
	mov	#-1, r0
	cmp/eq	r0, r9
	bf/s	99f
	 mov	#LLL_PRIVATE, r5
	mov	#LLL_SHARED, r5
99:
	mov.l	.Lwake6, r1
	bsrf	r1
	 extu.b	r5, r5
.Lwake6b:
	bra	8b
	 nop

9:
	mov	#-1, r0
	cmp/eq	r0, r9
	bt/s	99f
	 mov	#FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
	mov	#(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
	extu.b	r5, r5
#else
	stc	gbr, r1
	mov.w	.Lpfoff, r2
	add	r2, r1
	mov.l	@r1, r5
	mov	#FUTEX_WAKE, r0
	or	r0, r5
#endif
99:
	mov	#-1, r6
	shlr	r6		/* r6 = 0x7fffffff */
	mov	#0, r7
	mov	#SYS_futex, r3
	extu.b	r3, r3
	trapa	#0x14
	SYSCALL_INST_PAD
	bra	10b
	 nop

#ifndef __ASSUME_PRIVATE_FUTEX
.Lpfoff:
	.word	PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
#endif

	.align	2
.Lwait5:
	.long	__lll_lock_wait-.Lwait5b
.Lwake5:
	.long	__lll_unlock_wake-.Lwake5b
.Lwake6:
	.long	__lll_unlock_wake-.Lwake6b
	.size	__pthread_cond_broadcast, .-__pthread_cond_broadcast
weak_alias (__pthread_cond_broadcast, pthread_cond_broadcast)