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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
[glibc.git] / nptl / sysdeps / unix / sysv / linux / powerpc / lowlevellock.h
blob2bee000730397cbd0b096beea400979182c682d0
1 /* Copyright (C) 2003, 2004 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 Libr \ary; 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
37 /* Initializer for compatibility lock. */
38 #define LLL_MUTEX_LOCK_INITIALIZER (0)
39
40 #define lll_futex_wait(futexp, val) \
41 ({ \
42 INTERNAL_SYSCALL_DECL (__err); \
43 long int __ret; \
44 \
45 __ret = INTERNAL_SYSCALL (futex, __err, 4, \
46 (futexp), FUTEX_WAIT, (val), 0); \
47 INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
48 })
49
50 #define lll_futex_timed_wait(futexp, val, timespec) \
51 ({ \
52 INTERNAL_SYSCALL_DECL (__err); \
53 long int __ret; \
54 \
55 __ret = INTERNAL_SYSCALL (futex, __err, 4, \
56 (futexp), FUTEX_WAIT, (val), (timespec)); \
57 INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
58 })
59
60 #define lll_futex_wake(futexp, nr) \
61 ({ \
62 INTERNAL_SYSCALL_DECL (__err); \
63 long int __ret; \
64 \
65 __ret = INTERNAL_SYSCALL (futex, __err, 4, \
66 (futexp), FUTEX_WAKE, (nr), 0); \
67 INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \
68 })
69
70 /* Returns non-zero if error happened, zero if success. */
71 #define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \
72 ({ \
73 INTERNAL_SYSCALL_DECL (__err); \
74 long int __ret; \
75 \
76 __ret = INTERNAL_SYSCALL (futex, __err, 6, \
77 (futexp), FUTEX_CMP_REQUEUE, (nr_wake), \
78 (nr_move), (mutex), (val)); \
79 INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
80 })
81
82 #ifdef UP
83 # define __lll_acq_instr ""
84 # define __lll_rel_instr ""
85 #else
86 # define __lll_acq_instr "isync"
87 # define __lll_rel_instr "sync"
88 #endif
89
90 /* Set *futex to 1 if it is 0, atomically. Returns the old value */
91 #define __lll_trylock(futex) \
92 ({ int __val; \
93 __asm __volatile ("1: lwarx %0,0,%2\n" \
94 " cmpwi 0,%0,0\n" \
95 " bne 2f\n" \
96 " stwcx. %3,0,%2\n" \
97 " bne- 1b\n" \
98 "2: " __lll_acq_instr \
99 : "=&r" (__val), "=m" (*futex) \
100 : "r" (futex), "r" (1), "m" (*futex) \
101 : "cr0", "memory"); \
102 __val; \
103 })
104
105 #define lll_mutex_trylock(lock) __lll_trylock (&(lock))
106
107 /* Set *futex to 2 if it is 0, atomically. Returns the old value */
108 #define __lll_cond_trylock(futex) \
109 ({ int __val; \
110 __asm __volatile ("1: lwarx %0,0,%2\n" \
111 " cmpwi 0,%0,0\n" \
112 " bne 2f\n" \
113 " stwcx. %3,0,%2\n" \
114 " bne- 1b\n" \
115 "2: " __lll_acq_instr \
116 : "=&r" (__val), "=m" (*futex) \
117 : "r" (futex), "r" (2), "m" (*futex) \
118 : "cr0", "memory"); \
119 __val; \
120 })
121 #define lll_mutex_cond_trylock(lock) __lll_cond_trylock (&(lock))
122
123
124 extern void __lll_lock_wait (int *futex) attribute_hidden;
125
126 #define lll_mutex_lock(lock) \
127 (void) ({ \
128 int *__futex = &(lock); \
129 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
130 0) != 0) \
131 __lll_lock_wait (__futex); \
132 })
133
134 #define lll_mutex_cond_lock(lock) \
135 (void) ({ \
136 int *__futex = &(lock); \
137 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\
138 0) != 0) \
139 __lll_lock_wait (__futex); \
140 })
141
142 extern int __lll_timedlock_wait
143 (int *futex, const struct timespec *) attribute_hidden;
144
145 #define lll_mutex_timedlock(lock, abstime) \
146 ({ \
147 int *__futex = &(lock); \
148 int __val = 0; \
149 if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
150 0) != 0) \
151 __val = __lll_timedlock_wait (__futex, abstime); \
152 __val; \
153 })
154
155 #define lll_mutex_unlock(lock) \
156 ((void) ({ \
157 int *__futex = &(lock); \
158 int __val = atomic_exchange_rel (__futex, 0); \
159 if (__builtin_expect (__val > 1, 0)) \
160 lll_futex_wake (__futex, 1); \
161 }))
162
163 #define lll_mutex_unlock_force(lock) \
164 ((void) ({ \
165 int *__futex = &(lock); \
166 *__futex = 0; \
167 __asm __volatile (__lll_rel_instr ::: "memory"); \
168 lll_futex_wake (__futex, 1); \
169 }))
170
171 #define lll_mutex_islocked(futex) \
172 (futex != 0)
173
174
175 /* Our internal lock implementation is identical to the binary-compatible
176 mutex implementation. */
177
178 /* Type for lock object. */
179 typedef int lll_lock_t;
180
181 /* Initializers for lock. */
182 #define LLL_LOCK_INITIALIZER (0)
183 #define LLL_LOCK_INITIALIZER_LOCKED (1)
184
185 extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
186
187 /* The states of a lock are:
188 0 - untaken
189 1 - taken by one user
190 >1 - taken by more users */
191
192 #define lll_trylock(lock) lll_mutex_trylock (lock)
193 #define lll_lock(lock) lll_mutex_lock (lock)
194 #define lll_unlock(lock) lll_mutex_unlock (lock)
195 #define lll_islocked(lock) lll_mutex_islocked (lock)
196
197 /* The kernel notifies a process which uses CLONE_CLEARTID via futex
198 wakeup when the clone terminates. The memory location contains the
199 thread ID while the clone is running and is reset to zero
200 afterwards. */
201 #define lll_wait_tid(tid) \
202 do { \
203 __typeof (tid) __tid; \
204 while ((__tid = (tid)) != 0) \
205 lll_futex_wait (&(tid), __tid); \
206 } while (0)
207
208 extern int __lll_timedwait_tid (int *, const struct timespec *)
209 attribute_hidden;
210
211 #define lll_timedwait_tid(tid, abstime) \
212 ({ \
213 int __res = 0; \
214 if ((tid) != 0) \
215 __res = __lll_timedwait_tid (&(tid), (abstime)); \
216 __res; \
217 })
218
219
220 /* Conditional variable handling. */
221
222 extern void __lll_cond_wait (pthread_cond_t *cond)
223 attribute_hidden;
224 extern int __lll_cond_timedwait (pthread_cond_t *cond,
225 const struct timespec *abstime)
226 attribute_hidden;
227 extern void __lll_cond_wake (pthread_cond_t *cond)
228 attribute_hidden;
229 extern void __lll_cond_broadcast (pthread_cond_t *cond)
230 attribute_hidden;
231
232 #define lll_cond_wait(cond) \
233 __lll_cond_wait (cond)
234 #define lll_cond_timedwait(cond, abstime) \
235 __lll_cond_timedwait (cond, abstime)
236 #define lll_cond_wake(cond) \
237 __lll_cond_wake (cond)
238 #define lll_cond_broadcast(cond) \
239 __lll_cond_broadcast (cond)
240
241 #endif /* lowlevellock.h */
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