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MicroBlaze: Consolidate NPTL/non versions of vfork
[glibc.git] / sysdeps / unix / sysv / linux / microblaze / nptl / lowlevellock.h
blob47e18061e187851d6319beecfd502c139ba1c176
1 /* Copyright (C) 2005-2014 Free Software Foundation, Inc.
2
3 This file is part of the GNU C Library.
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, see
17 <http://www.gnu.org/licenses/>. */
18
19 #ifndef _LOWLEVELLOCK_H
20 #define _LOWLEVELLOCK_H 1
21
22 #include <time.h>
23 #include <sys/param.h>
24 #include <bits/pthreadtypes.h>
25 #include <atomic.h>
26 #include <sysdep.h>
27 #include <kernel-features.h>
28 #include <tls.h> /* Need THREAD_*, and header.*. */
29
30 #define FUTEX_WAIT 0
31 #define FUTEX_WAKE 1
32 #define FUTEX_REQUEUE 3
33 #define FUTEX_CMP_REQUEUE 4
34 #define FUTEX_WAKE_OP 5
35 #define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
36 #define FUTEX_LOCK_PI 6
37 #define FUTEX_UNLOCK_PI 7
38 #define FUTEX_TRYLOCK_PI 8
39 #define FUTEX_WAIT_BITSET 9
40 #define FUTEX_WAKE_BITSET 10
41 #define FUTEX_WAIT_REQUEUE_PI 11
42 #define FUTEX_CMP_REQUEUE_PI 12
43 #define FUTEX_PRIVATE_FLAG 128
44 #define FUTEX_CLOCK_REALTIME 256
45
46 #define FUTEX_BITSET_MATCH_ANY 0xffffffff
47
48 /* Values for 'private' parameter of locking macros. Yes, the
49 definition seems to be backwards. But it is not. The bit will be
50 reversed before passing to the system call. */
51 #define LLL_PRIVATE 0
52 #define LLL_SHARED FUTEX_PRIVATE_FLAG
53
54
55 #if !defined NOT_IN_libc || defined IS_IN_rtld
56 /* In libc.so or ld.so all futexes are private. */
57 # ifdef __ASSUME_PRIVATE_FUTEX
58 # define __lll_private_flag(fl, private) \
59 ((fl) | FUTEX_PRIVATE_FLAG)
60 # else
61 # define __lll_private_flag(fl, private) \
62 ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
63 # endif
64 #else
65 # ifdef __ASSUME_PRIVATE_FUTEX
66 # define __lll_private_flag(fl, private) \
67 (((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
68 # else
69 # define __lll_private_flag(fl, private) \
70 (__builtin_constant_p (private) \
71 ? ((private) == 0 \
72 ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
73 : (fl)) \
74 : ((fl) | (((private) ^ FUTEX_PRIVATE_FLAG) \
75 & THREAD_GETMEM (THREAD_SELF, header.private_futex))))
76 # endif
77 #endif
78
79
80 #define lll_futex_wait(futexp, val, private) \
81 lll_futex_timed_wait (futexp, val, NULL, private)
82
83 #define lll_futex_timed_wait(futexp, val, timespec, private) \
84 ({ \
85 INTERNAL_SYSCALL_DECL (__err); \
86 long int __ret; \
87 __ret = INTERNAL_SYSCALL (futex, __err, 4, (long) (futexp), \
88 __lll_private_flag (FUTEX_WAIT, private), \
89 (val), (timespec)); \
90 __ret; \
91 })
92
93 #define lll_futex_timed_wait_bitset(futexp, val, timespec, clockbit, private) \
94 ({ \
95 INTERNAL_SYSCALL_DECL (__err); \
96 long int __ret; \
97 int __op = FUTEX_WAIT_BITSET | clockbit; \
98 __ret = INTERNAL_SYSCALL (futex, __err, 6, (long) (futexp), \
99 __lll_private_flag (__op, private), \
100 (val), (timespec), NULL /* Unused. */, \
101 FUTEX_BITSET_MATCH_ANY); \
102 __ret; \
103 })
104
105 #define lll_futex_wake(futexp, nr, private) \
106 ({ \
107 INTERNAL_SYSCALL_DECL (__err); \
108 long int __ret; \
109 __ret = INTERNAL_SYSCALL (futex, __err, 4, (long) (futexp), \
110 __lll_private_flag (FUTEX_WAKE, private), \
111 (nr), 0); \
112 __ret; \
113 })
114
115 #define lll_robust_dead(futexv, private) \
116 do \
117 { \
118 int *__futexp = &(futexv); \
119 atomic_or (__futexp, FUTEX_OWNER_DIED); \
120 lll_futex_wake (__futexp, 1, private); \
121 } \
122 while (0)
123
124 /* Returns non-zero if error happened, zero if success. */
125 #define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \
126 ({ \
127 INTERNAL_SYSCALL_DECL (__err); \
128 long int __ret; \
129 __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
130 __lll_private_flag (FUTEX_CMP_REQUEUE, private), \
131 (nr_wake), (nr_move), (mutex), (val)); \
132 INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
133 })
134
135
136 /* Returns non-zero if error happened, zero if success. */
137 #define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \
138 ({ \
139 INTERNAL_SYSCALL_DECL (__err); \
140 long int __ret; \
141 \
142 __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
143 __lll_private_flag (FUTEX_WAKE_OP, private), \
144 (nr_wake), (nr_wake2), (futexp2), \
145 FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
146 INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
147 })
148
149 /* Priority Inheritance support. */
150 #define lll_futex_wait_requeue_pi(futexp, val, mutex, private) \
151 lll_futex_timed_wait_requeue_pi (futexp, val, NULL, 0, mutex, private)
152
153 #define lll_futex_timed_wait_requeue_pi(futexp, val, timespec, clockbit, \
154 mutex, private) \
155 ({ \
156 INTERNAL_SYSCALL_DECL (__err); \
157 long int __ret; \
158 int __op = FUTEX_WAIT_REQUEUE_PI | clockbit; \
159 \
160 __ret = INTERNAL_SYSCALL (futex, __err, 5, (futexp), \
161 __lll_private_flag (__op, private), \
162 (val), (timespec), mutex); \
163 __ret; \
164 })
165
166 #define lll_futex_cmp_requeue_pi(futexp, nr_wake, nr_move, mutex, val, priv) \
167 ({ \
168 INTERNAL_SYSCALL_DECL (__err); \
169 long int __ret; \
170 \
171 __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
172 __lll_private_flag (FUTEX_CMP_REQUEUE_PI, priv), \
173 (nr_wake), (nr_move), (mutex), (val)); \
174 INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
175 })
176
177 #define lll_trylock(lock) \
178 atomic_compare_and_exchange_val_acq(&(lock), 1, 0)
179
180 #define lll_cond_trylock(lock) \
181 atomic_compare_and_exchange_val_acq(&(lock), 2, 0)
182
183 #define __lll_robust_trylock(futex, id) \
184 (atomic_compare_and_exchange_val_acq (futex, id, 0) != 0)
185 #define lll_robust_trylock(lock, id) \
186 __lll_robust_trylock (&(lock), id)
187
188 extern void __lll_lock_wait_private (int *futex) attribute_hidden;
189 extern void __lll_lock_wait (int *futex, int private) attribute_hidden;
190 extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden;
191
192 #define __lll_lock(futex, private) \
193 ((void) ({ \
194 int *__futex = (futex); \
195 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0), \
196 0) != 0) \
197 { \
198 if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
199 __lll_lock_wait_private (__futex); \
200 else \
201 __lll_lock_wait (__futex, private); \
202 } \
203 }))
204 #define lll_lock(futex, private) __lll_lock (&(futex), private)
205
206 #define __lll_robust_lock(futex, id, private) \
207 ({ \
208 int *__futex = (futex); \
209 int __val = 0; \
210 \
211 if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \
212 0), 0)) \
213 __val = __lll_robust_lock_wait (__futex, private); \
214 __val; \
215 })
216 #define lll_robust_lock(futex, id, private) \
217 __lll_robust_lock (&(futex), id, private)
218
219 static inline void __attribute__ ((always_inline))
220 __lll_cond_lock (int *futex, int private)
221 {
222 if (__builtin_expect (atomic_exchange_acq (futex, 2), 0))
223 __lll_lock_wait (futex, private);
224 }
225 #define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private)
226
227 #define lll_robust_cond_lock(futex, id, private) \
228 __lll_robust_lock (&(futex), (id) | FUTEX_WAITERS, private)
229
230
231 extern int __lll_timedlock_wait (int *futex, const struct timespec *,
232 int private) attribute_hidden;
233 extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *,
234 int private) attribute_hidden;
235
236 static inline int __attribute__ ((always_inline))
237 __lll_timedlock (int *futex, const struct timespec *abstime, int private)
238 {
239 int result = 0;
240 if (__builtin_expect (atomic_compare_and_exchange_val_acq (futex, 1, 0), 0) != 0)
241 result = __lll_timedlock_wait (futex, abstime, private);
242 return result;
243 }
244 #define lll_timedlock(futex, abstime, private) \
245 __lll_timedlock (&(futex), abstime, private)
246
247 static inline int __attribute__ ((always_inline))
248 __lll_robust_timedlock (int *futex, const struct timespec *abstime,
249 int id, int private)
250 {
251 int result = 0;
252 if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, id, 0), 0))
253 result = __lll_robust_timedlock_wait (futex, abstime, private);
254 return result;
255 }
256 #define lll_robust_timedlock(futex, abstime, id, private) \
257 __lll_robust_timedlock (&(futex), abstime, id, private)
258
259 #define __lll_unlock(futex, private) \
260 ((void) ({ \
261 int *__futex = (futex); \
262 int __val = atomic_exchange_rel (__futex, 0); \
263 \
264 if (__builtin_expect (__val > 1, 0)) \
265 lll_futex_wake (__futex, 1, private); \
266 }))
267 #define lll_unlock(futex, private) __lll_unlock(&(futex), private)
268
269 #define __lll_robust_unlock(futex, private) \
270 ((void) ({ \
271 int *__futex = (futex); \
272 int __val = atomic_exchange_rel (__futex, 0); \
273 \
274 if (__builtin_expect (__val & FUTEX_WAITERS, 0)) \
275 lll_futex_wake (__futex, 1, private); \
276 }))
277 #define lll_robust_unlock(futex, private) \
278 __lll_robust_unlock(&(futex), private)
279
280 #define lll_islocked(futex) \
281 (futex != 0)
282
283 /* Our internal lock implementation is identical to the binary-compatible
284 mutex implementation. */
285
286 /* Initializers for lock. */
287 #define LLL_LOCK_INITIALIZER (0)
288 #define LLL_LOCK_INITIALIZER_LOCKED (1)
289
290 /* The states of a lock are:
291 0 - untaken
292 1 - taken by one user
293 >1 - taken by more users. */
294
295 /* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via futex
296 wakeup when the clone terminates. The memory location contains the
297 thread ID while the clone is running and is reset to zero
298 afterwards. */
299 #define lll_wait_tid(tid) \
300 do { \
301 __typeof (tid) __tid; \
302 while ((__tid = (tid)) != 0) \
303 lll_futex_wait (&(tid), __tid, LLL_SHARED); \
304 } while (0)
305
306 extern int __lll_timedwait_tid (int *, const struct timespec *)
307 attribute_hidden;
308
309 #define lll_timedwait_tid(tid, abstime) \
310 ({ \
311 int __res = 0; \
312 if ((tid) != 0) \
313 __res = __lll_timedwait_tid (&(tid), (abstime)); \
314 __res; \
315 })
316
317 #endif /* lowlevellock.h. */
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