Cleanup some c99 pedantic warnings
[urcu.git] / tests / common / api.h
1 #ifndef _INCLUDE_API_H
2 #define _INCLUDE_API_H
3
4 #define _GNU_SOURCE
5 #include "config.h"
6
7 /*
8 * common.h: Common Linux kernel-isms.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; but version 2 of the License only due
13 * to code included from the Linux kernel.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 *
24 * Copyright (c) 2006 Paul E. McKenney, IBM.
25 *
26 * Much code taken from the Linux kernel. For such code, the option
27 * to redistribute under later versions of GPL might not be available.
28 */
29
30 #include <urcu/compiler.h>
31 #include <urcu/arch.h>
32 #include "cpuset.h"
33
34 /*
35 * Machine parameters.
36 */
37
38 #define ____cacheline_internodealigned_in_smp \
39 __attribute__((__aligned__(CAA_CACHE_LINE_SIZE)))
40
41 /*
42 * api_pthreads.h: API mapping to pthreads environment.
43 *
44 * This program is free software; you can redistribute it and/or modify
45 * it under the terms of the GNU General Public License as published by
46 * the Free Software Foundation; either version 2 of the License, or
47 * (at your option) any later version. However, please note that much
48 * of the code in this file derives from the Linux kernel, and that such
49 * code may not be available except under GPLv2.
50 *
51 * This program is distributed in the hope that it will be useful,
52 * but WITHOUT ANY WARRANTY; without even the implied warranty of
53 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
54 * GNU General Public License for more details.
55 *
56 * You should have received a copy of the GNU General Public License
57 * along with this program; if not, write to the Free Software
58 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
59 *
60 * Copyright (c) 2006 Paul E. McKenney, IBM.
61 */
62
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <errno.h>
66 #include <limits.h>
67 #include <sys/types.h>
68 #include <pthread.h>
69 #include <sys/param.h>
70 /* #include "atomic.h" */
71
72 /*
73 * Exclusive locking primitives.
74 */
75
76 typedef pthread_mutex_t spinlock_t;
77
78 #define DEFINE_SPINLOCK(lock) spinlock_t lock = PTHREAD_MUTEX_INITIALIZER;
79 #define __SPIN_LOCK_UNLOCKED(lockp) PTHREAD_MUTEX_INITIALIZER
80
81 static void spin_lock_init(spinlock_t *sp)
82 {
83 if (pthread_mutex_init(sp, NULL) != 0) {
84 perror("spin_lock_init:pthread_mutex_init");
85 exit(-1);
86 }
87 }
88
89 static void spin_lock(spinlock_t *sp)
90 {
91 if (pthread_mutex_lock(sp) != 0) {
92 perror("spin_lock:pthread_mutex_lock");
93 exit(-1);
94 }
95 }
96
97 static void spin_unlock(spinlock_t *sp)
98 {
99 if (pthread_mutex_unlock(sp) != 0) {
100 perror("spin_unlock:pthread_mutex_unlock");
101 exit(-1);
102 }
103 }
104
105 #define spin_lock_irqsave(l, f) do { f = 1; spin_lock(l); } while (0)
106 #define spin_unlock_irqrestore(l, f) do { f = 0; spin_unlock(l); } while (0)
107
108 /*
109 * Thread creation/destruction primitives.
110 */
111
112 typedef pthread_t thread_id_t;
113
114 #define NR_THREADS 128
115
116 #define __THREAD_ID_MAP_EMPTY ((thread_id_t) 0)
117 #define __THREAD_ID_MAP_WAITING ((thread_id_t) 1)
118 thread_id_t __thread_id_map[NR_THREADS];
119 spinlock_t __thread_id_map_mutex;
120
121 #define for_each_thread(t) \
122 for (t = 0; t < NR_THREADS; t++)
123
124 #define for_each_running_thread(t) \
125 for (t = 0; t < NR_THREADS; t++) \
126 if ((__thread_id_map[t] != __THREAD_ID_MAP_EMPTY) && \
127 (__thread_id_map[t] != __THREAD_ID_MAP_WAITING))
128
129 #define for_each_tid(t, tid) \
130 for (t = 0; t < NR_THREADS; t++) \
131 if ((((tid) = __thread_id_map[t]) != __THREAD_ID_MAP_EMPTY) && \
132 ((tid) != __THREAD_ID_MAP_WAITING))
133
134 pthread_key_t thread_id_key;
135
136 static int __smp_thread_id(void)
137 {
138 int i;
139 thread_id_t tid = pthread_self();
140
141 for (i = 0; i < NR_THREADS; i++) {
142 if (__thread_id_map[i] == tid) {
143 long v = i + 1; /* must be non-NULL. */
144
145 if (pthread_setspecific(thread_id_key, (void *)v) != 0) {
146 perror("pthread_setspecific");
147 exit(-1);
148 }
149 return i;
150 }
151 }
152 spin_lock(&__thread_id_map_mutex);
153 for (i = 0; i < NR_THREADS; i++) {
154 if (__thread_id_map[i] == tid) {
155 spin_unlock(&__thread_id_map_mutex);
156 return i;
157 }
158 }
159 spin_unlock(&__thread_id_map_mutex);
160 fprintf(stderr, "smp_thread_id: Rogue thread, id: %lu(%#lx)\n",
161 (unsigned long) tid, (unsigned long) tid);
162 exit(-1);
163 }
164
165 static int smp_thread_id(void)
166 {
167 void *id;
168
169 id = pthread_getspecific(thread_id_key);
170 if (id == NULL)
171 return __smp_thread_id();
172 return (long)(id - 1);
173 }
174
175 static thread_id_t create_thread(void *(*func)(void *), void *arg)
176 {
177 thread_id_t tid;
178 int i;
179
180 spin_lock(&__thread_id_map_mutex);
181 for (i = 0; i < NR_THREADS; i++) {
182 if (__thread_id_map[i] == __THREAD_ID_MAP_EMPTY)
183 break;
184 }
185 if (i >= NR_THREADS) {
186 spin_unlock(&__thread_id_map_mutex);
187 fprintf(stderr, "Thread limit of %d exceeded!\n", NR_THREADS);
188 exit(-1);
189 }
190 __thread_id_map[i] = __THREAD_ID_MAP_WAITING;
191 spin_unlock(&__thread_id_map_mutex);
192 if (pthread_create(&tid, NULL, func, arg) != 0) {
193 perror("create_thread:pthread_create");
194 exit(-1);
195 }
196 __thread_id_map[i] = tid;
197 return tid;
198 }
199
200 static void *wait_thread(thread_id_t tid)
201 {
202 int i;
203 void *vp;
204
205 for (i = 0; i < NR_THREADS; i++) {
206 if (__thread_id_map[i] == tid)
207 break;
208 }
209 if (i >= NR_THREADS){
210 fprintf(stderr, "wait_thread: bad tid = %lu(%#lx)\n",
211 (unsigned long)tid, (unsigned long)tid);
212 exit(-1);
213 }
214 if (pthread_join(tid, &vp) != 0) {
215 perror("wait_thread:pthread_join");
216 exit(-1);
217 }
218 __thread_id_map[i] = __THREAD_ID_MAP_EMPTY;
219 return vp;
220 }
221
222 static void wait_all_threads(void)
223 {
224 int i;
225 thread_id_t tid;
226
227 for (i = 1; i < NR_THREADS; i++) {
228 tid = __thread_id_map[i];
229 if (tid != __THREAD_ID_MAP_EMPTY &&
230 tid != __THREAD_ID_MAP_WAITING)
231 (void)wait_thread(tid);
232 }
233 }
234
235 static void run_on(int cpu)
236 {
237 #if HAVE_SCHED_SETAFFINITY
238 cpu_set_t mask;
239
240 CPU_ZERO(&mask);
241 CPU_SET(cpu, &mask);
242 #if SCHED_SETAFFINITY_ARGS == 2
243 sched_setaffinity(0, &mask);
244 #else
245 sched_setaffinity(0, sizeof(mask), &mask);
246 #endif
247 #endif /* HAVE_SCHED_SETAFFINITY */
248 }
249
250 /*
251 * timekeeping -- very crude -- should use MONOTONIC...
252 */
253
254 long long get_microseconds(void)
255 {
256 struct timeval tv;
257
258 if (gettimeofday(&tv, NULL) != 0)
259 abort();
260 return ((long long)tv.tv_sec) * 1000000LL + (long long)tv.tv_usec;
261 }
262
263 /*
264 * Per-thread variables.
265 */
266
267 #define DEFINE_PER_THREAD(type, name) \
268 struct { \
269 __typeof__(type) v \
270 __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))); \
271 } __per_thread_##name[NR_THREADS]
272 #define DECLARE_PER_THREAD(type, name) extern DEFINE_PER_THREAD(type, name)
273
274 #define per_thread(name, thread) __per_thread_##name[thread].v
275 #define __get_thread_var(name) per_thread(name, smp_thread_id())
276
277 #define init_per_thread(name, v) \
278 do { \
279 int __i_p_t_i; \
280 for (__i_p_t_i = 0; __i_p_t_i < NR_THREADS; __i_p_t_i++) \
281 per_thread(name, __i_p_t_i) = v; \
282 } while (0)
283
284 DEFINE_PER_THREAD(int, smp_processor_id);
285
286 /*
287 * Bug checks.
288 */
289
290 #define BUG_ON(c) do { if (!(c)) abort(); } while (0)
291
292 /*
293 * Initialization -- Must be called before calling any primitives.
294 */
295
296 static void smp_init(void)
297 {
298 int i;
299
300 spin_lock_init(&__thread_id_map_mutex);
301 __thread_id_map[0] = pthread_self();
302 for (i = 1; i < NR_THREADS; i++)
303 __thread_id_map[i] = __THREAD_ID_MAP_EMPTY;
304 init_per_thread(smp_processor_id, 0);
305 if (pthread_key_create(&thread_id_key, NULL) != 0) {
306 perror("pthread_key_create");
307 exit(-1);
308 }
309 }
310
311 #endif
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