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[glibc.git] / nptl / sysdeps / unix / sysv / linux / powerpc / lowlevellock.h
blob0136b975955398478e88e4f382cb7f721e5d6d26
1 /* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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 #ifndef _LOWLEVELLOCK_H
21 #define _LOWLEVELLOCK_H 1
22
23 #include <time.h>
24 #include <sys/param.h>
25 #include <bits/pthreadtypes.h>
26 #include <atomic.h>
27
28
29 #ifndef __NR_futex
30 # define __NR_futex 221
31 #endif
32 #define FUTEX_WAIT 0
33 #define FUTEX_WAKE 1
34 #define FUTEX_REQUEUE 3
35 #define FUTEX_CMP_REQUEUE 4
36 #define FUTEX_WAKE_OP 5
37 #define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
38 #define FUTEX_LOCK_PI 6
39 #define FUTEX_UNLOCK_PI 7
40 #define FUTEX_TRYLOCK_PI 8
41
42 /* Initializer for compatibility lock. */
43 #define LLL_MUTEX_LOCK_INITIALIZER (0)
44
45 #define lll_futex_wait(futexp, val) \
46 ({ \
47 INTERNAL_SYSCALL_DECL (__err); \
48 long int __ret; \
49 \
50 __ret = INTERNAL_SYSCALL (futex, __err, 4, \
51 (futexp), FUTEX_WAIT, (val), 0); \
52 INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
53 })
54
55 #define lll_futex_timed_wait(futexp, val, timespec) \
56 ({ \
57 INTERNAL_SYSCALL_DECL (__err); \
58 long int __ret; \
59 \
60 __ret = INTERNAL_SYSCALL (futex, __err, 4, \
61 (futexp), FUTEX_WAIT, (val), (timespec)); \
62 INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
63 })
64
65 #define lll_futex_wake(futexp, nr) \
66 ({ \
67 INTERNAL_SYSCALL_DECL (__err); \
68 long int __ret; \
69 \
70 __ret = INTERNAL_SYSCALL (futex, __err, 4, \
71 (futexp), FUTEX_WAKE, (nr), 0); \
72 INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
73 })
74
75 #define lll_robust_mutex_dead(futexv) \
76 do \
77 { \
78 INTERNAL_SYSCALL_DECL (__err); \
79 int *__futexp = &(futexv); \
80 \
81 atomic_or (__futexp, FUTEX_OWNER_DIED); \
82 INTERNAL_SYSCALL (futex, __err, 4, __futexp, FUTEX_WAKE, 1, 0); \
83 } \
84 while (0)
85
86 /* Returns non-zero if error happened, zero if success. */
87 #define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \
88 ({ \
89 INTERNAL_SYSCALL_DECL (__err); \
90 long int __ret; \
91 \
92 __ret = INTERNAL_SYSCALL (futex, __err, 6, \
93 (futexp), FUTEX_CMP_REQUEUE, (nr_wake), \
94 (nr_move), (mutex), (val)); \
95 INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
96 })
97
98 /* Returns non-zero if error happened, zero if success. */
99 #define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2) \
100 ({ \
101 INTERNAL_SYSCALL_DECL (__err); \
102 long int __ret; \
103 \
104 __ret = INTERNAL_SYSCALL (futex, __err, 6, \
105 (futexp), FUTEX_WAKE_OP, (nr_wake), \
106 (nr_wake2), (futexp2), \
107 FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
108 INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
109 })
110
111 #ifdef UP
112 # define __lll_acq_instr ""
113 # define __lll_rel_instr ""
114 #else
115 # define __lll_acq_instr "isync"
116 # ifdef _ARCH_PWR4
117 /*
118 * Newer powerpc64 processors support the new "light weight" sync (lwsync)
119 * So if the build is using -mcpu=[power4,power5,power5+,970] we can
120 * safely use lwsync.
121 */
122 # define __lll_rel_instr "lwsync"
123 # else
124 /*
125 * Older powerpc32 processors don't support the new "light weight"
126 * sync (lwsync). So the only safe option is to use normal sync
127 * for all powerpc32 applications.
128 */
129 # define __lll_rel_instr "sync"
130 # endif
131 #endif
132
133 /* Set *futex to ID if it is 0, atomically. Returns the old value */
134 #define __lll_robust_trylock(futex, id) \
135 ({ int __val; \
136 __asm __volatile ("1: lwarx %0,0,%2\n" \
137 " cmpwi 0,%0,0\n" \
138 " bne 2f\n" \
139 " stwcx. %3,0,%2\n" \
140 " bne- 1b\n" \
141 "2: " __lll_acq_instr \
142 : "=&r" (__val), "=m" (*futex) \
143 : "r" (futex), "r" (id), "m" (*futex) \
144 : "cr0", "memory"); \
145 __val; \
146 })
147
148 #define lll_robust_mutex_trylock(lock, id) __lll_robust_trylock (&(lock), id)
149
150 /* Set *futex to 1 if it is 0, atomically. Returns the old value */
151 #define __lll_trylock(futex) __lll_robust_trylock (futex, 1)
152
153 #define lll_mutex_trylock(lock) __lll_trylock (&(lock))
154
155 /* Set *futex to 2 if it is 0, atomically. Returns the old value */
156 #define __lll_cond_trylock(futex) __lll_robust_trylock (futex, 2)
157
158 #define lll_mutex_cond_trylock(lock) __lll_cond_trylock (&(lock))
159
160
161 extern void __lll_lock_wait (int *futex) attribute_hidden;
162 extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
163
164 #define lll_mutex_lock(lock) \
165 (void) ({ \
166 int *__futex = &(lock); \
167 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
168 0) != 0) \
169 __lll_lock_wait (__futex); \
170 })
171
172 #define lll_robust_mutex_lock(lock, id) \
173 ({ \
174 int *__futex = &(lock); \
175 int __val = 0; \
176 if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \
177 0), 0)) \
178 __val = __lll_robust_lock_wait (__futex); \
179 __val; \
180 })
181
182 #define lll_mutex_cond_lock(lock) \
183 (void) ({ \
184 int *__futex = &(lock); \
185 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\
186 0) != 0) \
187 __lll_lock_wait (__futex); \
188 })
189
190 #define lll_robust_mutex_cond_lock(lock, id) \
191 ({ \
192 int *__futex = &(lock); \
193 int __val = 0; \
194 int __id = id | FUTEX_WAITERS; \
195 if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, __id,\
196 0), 0)) \
197 __val = __lll_robust_lock_wait (__futex); \
198 __val; \
199 })
200
201
202 extern int __lll_timedlock_wait
203 (int *futex, const struct timespec *) attribute_hidden;
204 extern int __lll_robust_timedlock_wait
205 (int *futex, const struct timespec *) attribute_hidden;
206
207 #define lll_mutex_timedlock(lock, abstime) \
208 ({ \
209 int *__futex = &(lock); \
210 int __val = 0; \
211 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
212 0) != 0) \
213 __val = __lll_timedlock_wait (__futex, abstime); \
214 __val; \
215 })
216
217 #define lll_robust_mutex_timedlock(lock, abstime, id) \
218 ({ \
219 int *__futex = &(lock); \
220 int __val = 0; \
221 if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \
222 0), 0)) \
223 __val = __lll_robust_timedlock_wait (__futex, abstime); \
224 __val; \
225 })
226
227 #define lll_mutex_unlock(lock) \
228 ((void) ({ \
229 int *__futex = &(lock); \
230 int __val = atomic_exchange_rel (__futex, 0); \
231 if (__builtin_expect (__val > 1, 0)) \
232 lll_futex_wake (__futex, 1); \
233 }))
234
235 #define lll_robust_mutex_unlock(lock) \
236 ((void) ({ \
237 int *__futex = &(lock); \
238 int __val = atomic_exchange_rel (__futex, 0); \
239 if (__builtin_expect (__val & FUTEX_WAITERS, 0)) \
240 lll_futex_wake (__futex, 1); \
241 }))
242
243 #define lll_mutex_unlock_force(lock) \
244 ((void) ({ \
245 int *__futex = &(lock); \
246 *__futex = 0; \
247 __asm __volatile (__lll_rel_instr ::: "memory"); \
248 lll_futex_wake (__futex, 1); \
249 }))
250
251 #define lll_mutex_islocked(futex) \
252 (futex != 0)
253
254
255 /* Our internal lock implementation is identical to the binary-compatible
256 mutex implementation. */
257
258 /* Type for lock object. */
259 typedef int lll_lock_t;
260
261 /* Initializers for lock. */
262 #define LLL_LOCK_INITIALIZER (0)
263 #define LLL_LOCK_INITIALIZER_LOCKED (1)
264
265 extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
266
267 /* The states of a lock are:
268 0 - untaken
269 1 - taken by one user
270 >1 - taken by more users */
271
272 #define lll_trylock(lock) lll_mutex_trylock (lock)
273 #define lll_lock(lock) lll_mutex_lock (lock)
274 #define lll_unlock(lock) lll_mutex_unlock (lock)
275 #define lll_islocked(lock) lll_mutex_islocked (lock)
276
277 /* The kernel notifies a process which uses CLONE_CLEARTID via futex
278 wakeup when the clone terminates. The memory location contains the
279 thread ID while the clone is running and is reset to zero
280 afterwards. */
281 #define lll_wait_tid(tid) \
282 do { \
283 __typeof (tid) __tid; \
284 while ((__tid = (tid)) != 0) \
285 lll_futex_wait (&(tid), __tid); \
286 } while (0)
287
288 extern int __lll_timedwait_tid (int *, const struct timespec *)
289 attribute_hidden;
290
291 #define lll_timedwait_tid(tid, abstime) \
292 ({ \
293 int __res = 0; \
294 if ((tid) != 0) \
295 __res = __lll_timedwait_tid (&(tid), (abstime)); \
296 __res; \
297 })
298
299
300 /* Conditional variable handling. */
301
302 extern void __lll_cond_wait (pthread_cond_t *cond)
303 attribute_hidden;
304 extern int __lll_cond_timedwait (pthread_cond_t *cond,
305 const struct timespec *abstime)
306 attribute_hidden;
307 extern void __lll_cond_wake (pthread_cond_t *cond)
308 attribute_hidden;
309 extern void __lll_cond_broadcast (pthread_cond_t *cond)
310 attribute_hidden;
311
312 #define lll_cond_wait(cond) \
313 __lll_cond_wait (cond)
314 #define lll_cond_timedwait(cond, abstime) \
315 __lll_cond_timedwait (cond, abstime)
316 #define lll_cond_wake(cond) \
317 __lll_cond_wake (cond)
318 #define lll_cond_broadcast(cond) \
319 __lll_cond_broadcast (cond)
320
321 #endif /* lowlevellock.h */
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