Annotation of src/lib/libc/include/reentrant.h, Revision 1.18
1.18 ! christos 1: /* $NetBSD: reentrant.h,v 1.17 2013/04/12 18:12:58 joerg Exp $ */
1.5 kleink 2:
1.1 jtc 3: /*-
1.7 thorpej 4: * Copyright (c) 1997, 1998, 2003 The NetBSD Foundation, Inc.
1.1 jtc 5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
1.7 thorpej 8: * by J.T. Conklin, by Nathan J. Williams, and by Jason R. Thorpe.
1.1 jtc 9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
31:
32: /*
33: * Requirements:
34: *
35: * 1. The thread safe mechanism should be lightweight so the library can
36: * be used by non-threaded applications without unreasonable overhead.
37: *
38: * 2. There should be no dependency on a thread engine for non-threaded
39: * applications.
40: *
41: * 3. There should be no dependency on any particular thread engine.
42: *
43: * 4. The library should be able to be compiled without support for thread
44: * safety.
45: *
46: *
47: * Rationale:
48: *
49: * One approach for thread safety is to provide discrete versions of the
50: * library: one thread safe, the other not. The disadvantage of this is
51: * that libc is rather large, and two copies of a library which are 99%+
52: * identical is not an efficent use of resources.
53: *
54: * Another approach is to provide a single thread safe library. However,
55: * it should not add significant run time or code size overhead to non-
56: * threaded applications.
57: *
58: * Since the NetBSD C library is used in other projects, it should be
59: * easy to replace the mutual exclusion primitives with ones provided by
60: * another system. Similarly, it should also be easy to remove all
61: * support for thread safety completely if the target environment does
62: * not support threads.
63: *
64: *
65: * Implementation Details:
66: *
1.7 thorpej 67: * The thread primitives used by the library (mutex_t, mutex_lock, etc.)
1.1 jtc 68: * are macros which expand to the cooresponding primitives provided by
69: * the thread engine or to nothing. The latter is used so that code is
70: * not unreasonably cluttered with #ifdefs when all thread safe support
71: * is removed.
72: *
1.7 thorpej 73: * The thread macros can be directly mapped to the mutex primitives from
1.1 jtc 74: * pthreads, however it should be reasonably easy to wrap another mutex
75: * implementation so it presents a similar interface.
76: *
1.7 thorpej 77: * The thread functions operate by dispatching to symbols which are, by
78: * default, weak-aliased to no-op functions in thread-stub/thread-stub.c
79: * (some uses of thread operations are conditional on __isthreaded, but
80: * not all of them are).
81: *
82: * When the thread library is linked in, it provides strong-alias versions
83: * of those symbols which dispatch to its own real thread operations.
1.8 thorpej 84: *
1.1 jtc 85: */
86:
1.10 nathanw 87: /*
1.12 rtr 88: * Abstract thread interface for thread-safe libraries. These routines
1.10 nathanw 89: * will use stubs in libc if the application is not linked against the
90: * pthread library, and the real function in the pthread library if it
91: * is.
92: */
93:
94: #include <pthread.h>
95: #include <signal.h>
96:
97: #define mutex_t pthread_mutex_t
98: #define MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
99:
100: #define mutexattr_t pthread_mutexattr_t
101:
102: #define MUTEX_TYPE_NORMAL PTHREAD_MUTEX_NORMAL
103: #define MUTEX_TYPE_ERRORCHECK PTHREAD_MUTEX_ERRORCHECK
104: #define MUTEX_TYPE_RECURSIVE PTHREAD_MUTEX_RECURSIVE
105:
106: #define cond_t pthread_cond_t
107: #define COND_INITIALIZER PTHREAD_COND_INITIALIZER
108:
109: #define condattr_t pthread_condattr_t
110:
111: #define rwlock_t pthread_rwlock_t
112: #define RWLOCK_INITIALIZER PTHREAD_RWLOCK_INITIALIZER
113:
114: #define rwlockattr_t pthread_rwlockattr_t
115:
116: #define thread_key_t pthread_key_t
117:
118: #define thr_t pthread_t
119:
120: #define thrattr_t pthread_attr_t
121:
122: #define once_t pthread_once_t
123: #define ONCE_INITIALIZER PTHREAD_ONCE_INIT
124:
1.15 joerg 125: #ifdef _REENTRANT
126:
1.10 nathanw 127: #ifndef __LIBC_THREAD_STUBS
128:
129: __BEGIN_DECLS
130: int __libc_mutex_init(mutex_t *, const mutexattr_t *);
131: int __libc_mutex_lock(mutex_t *);
132: int __libc_mutex_trylock(mutex_t *);
133: int __libc_mutex_unlock(mutex_t *);
134: int __libc_mutex_destroy(mutex_t *);
135:
136: int __libc_mutexattr_init(mutexattr_t *);
137: int __libc_mutexattr_settype(mutexattr_t *, int);
138: int __libc_mutexattr_destroy(mutexattr_t *);
139: __END_DECLS
140:
141: #define mutex_init(m, a) __libc_mutex_init((m), (a))
142: #define mutex_lock(m) __libc_mutex_lock((m))
143: #define mutex_trylock(m) __libc_mutex_trylock((m))
144: #define mutex_unlock(m) __libc_mutex_unlock((m))
145: #define mutex_destroy(m) __libc_mutex_destroy((m))
146:
147: #define mutexattr_init(ma) __libc_mutexattr_init((ma))
148: #define mutexattr_settype(ma, t) __libc_mutexattr_settype((ma), (t))
149: #define mutexattr_destroy(ma) __libc_mutexattr_destroy((ma))
150:
151: __BEGIN_DECLS
152: int __libc_cond_init(cond_t *, const condattr_t *);
153: int __libc_cond_signal(cond_t *);
154: int __libc_cond_broadcast(cond_t *);
155: int __libc_cond_wait(cond_t *, mutex_t *);
1.14 christos 156: #ifndef __LIBC12_SOURCE__
1.10 nathanw 157: int __libc_cond_timedwait(cond_t *, mutex_t *, const struct timespec *);
1.14 christos 158: #endif
1.10 nathanw 159: int __libc_cond_destroy(cond_t *);
160: __END_DECLS
161:
162: #define cond_init(c, t, a) __libc_cond_init((c), (a))
163: #define cond_signal(c) __libc_cond_signal((c))
164: #define cond_broadcast(c) __libc_cond_broadcast((c))
165: #define cond_wait(c, m) __libc_cond_wait((c), (m))
166: #define cond_timedwait(c, m, t) __libc_cond_timedwait((c), (m), (t))
167: #define cond_destroy(c) __libc_cond_destroy((c))
168:
169: __BEGIN_DECLS
170: int __libc_rwlock_init(rwlock_t *, const rwlockattr_t *);
171: int __libc_rwlock_rdlock(rwlock_t *);
172: int __libc_rwlock_wrlock(rwlock_t *);
173: int __libc_rwlock_tryrdlock(rwlock_t *);
174: int __libc_rwlock_trywrlock(rwlock_t *);
175: int __libc_rwlock_unlock(rwlock_t *);
176: int __libc_rwlock_destroy(rwlock_t *);
177: __END_DECLS
178:
179: #define rwlock_init(l, a) __libc_rwlock_init((l), (a))
180: #define rwlock_rdlock(l) __libc_rwlock_rdlock((l))
181: #define rwlock_wrlock(l) __libc_rwlock_wrlock((l))
182: #define rwlock_tryrdlock(l) __libc_rwlock_tryrdlock((l))
183: #define rwlock_trywrlock(l) __libc_rwlock_trywrlock((l))
184: #define rwlock_unlock(l) __libc_rwlock_unlock((l))
185: #define rwlock_destroy(l) __libc_rwlock_destroy((l))
186:
187: __BEGIN_DECLS
188: int __libc_thr_keycreate(thread_key_t *, void (*)(void *));
189: int __libc_thr_setspecific(thread_key_t, const void *);
190: void *__libc_thr_getspecific(thread_key_t);
191: int __libc_thr_keydelete(thread_key_t);
192: __END_DECLS
193:
194: #define thr_keycreate(k, d) __libc_thr_keycreate((k), (d))
195: #define thr_setspecific(k, p) __libc_thr_setspecific((k), (p))
196: #define thr_getspecific(k) __libc_thr_getspecific((k))
197: #define thr_keydelete(k) __libc_thr_keydelete((k))
198:
199: __BEGIN_DECLS
200: int __libc_thr_once(once_t *, void (*)(void));
201: int __libc_thr_sigsetmask(int, const sigset_t *, sigset_t *);
202: thr_t __libc_thr_self(void);
203: int __libc_thr_yield(void);
204: void __libc_thr_create(thr_t *, const thrattr_t *,
205: void *(*)(void *), void *);
206: void __libc_thr_exit(void *) __attribute__((__noreturn__));
207: int *__libc_thr_errno(void);
208: int __libc_thr_setcancelstate(int, int *);
1.11 ad 209: unsigned int __libc_thr_curcpu(void);
1.10 nathanw 210:
211: extern int __isthreaded;
212: __END_DECLS
213:
214: #define thr_once(o, f) __libc_thr_once((o), (f))
215: #define thr_sigsetmask(f, n, o) __libc_thr_sigsetmask((f), (n), (o))
216: #define thr_self() __libc_thr_self()
217: #define thr_yield() __libc_thr_yield()
218: #define thr_create(tp, ta, f, a) __libc_thr_create((tp), (ta), (f), (a))
219: #define thr_exit(v) __libc_thr_exit((v))
220: #define thr_errno() __libc_thr_errno()
221: #define thr_enabled() (__isthreaded)
222: #define thr_setcancelstate(n, o) __libc_thr_setcancelstate((n),(o))
1.11 ad 223: #define thr_curcpu() __libc_thr_curcpu()
1.16 christos 224:
225: #else /* __LIBC_THREAD_STUBS */
226:
227: __BEGIN_DECLS
228: void __libc_thr_init_stub(void);
229:
230: int __libc_mutex_init_stub(mutex_t *, const mutexattr_t *);
231: int __libc_mutex_lock_stub(mutex_t *);
232: int __libc_mutex_trylock_stub(mutex_t *);
233: int __libc_mutex_unlock_stub(mutex_t *);
234: int __libc_mutex_destroy_stub(mutex_t *);
235:
236: int __libc_mutexattr_init_stub(mutexattr_t *);
237: int __libc_mutexattr_destroy_stub(mutexattr_t *);
238: int __libc_mutexattr_settype_stub(mutexattr_t *, int);
239:
240: int __libc_cond_init_stub(cond_t *, const condattr_t *);
241: int __libc_cond_signal_stub(cond_t *);
242: int __libc_cond_broadcast_stub(cond_t *);
243: int __libc_cond_wait_stub(cond_t *, mutex_t *);
244: int __libc_cond_timedwait_stub(cond_t *, mutex_t *,
245: const struct timespec *);
246: int __libc_cond_destroy_stub(cond_t *);
247:
248: int __libc_rwlock_init_stub(rwlock_t *, const rwlockattr_t *);
249: int __libc_rwlock_rdlock_stub(rwlock_t *);
250: int __libc_rwlock_wrlock_stub(rwlock_t *);
251: int __libc_rwlock_tryrdlock_stub(rwlock_t *);
252: int __libc_rwlock_trywrlock_stub(rwlock_t *);
253: int __libc_rwlock_unlock_stub(rwlock_t *);
254: int __libc_rwlock_destroy_stub(rwlock_t *);
255:
256: int __libc_thr_keycreate_stub(thread_key_t *, void (*)(void *));
257: int __libc_thr_setspecific_stub(thread_key_t, const void *);
258: void *__libc_thr_getspecific_stub(thread_key_t);
259: int __libc_thr_keydelete_stub(thread_key_t);
260:
261: int __libc_thr_once_stub(once_t *, void (*)(void));
262: int __libc_thr_sigsetmask_stub(int, const sigset_t *, sigset_t *);
263: thr_t __libc_thr_self_stub(void);
264: int __libc_thr_yield_stub(void);
265: int __libc_thr_create_stub(thr_t *, const thrattr_t *,
266: void *(*)(void *), void *);
1.17 joerg 267: void __libc_thr_exit_stub(void *) __dead;
1.16 christos 268: int *__libc_thr_errno_stub(void);
269: int __libc_thr_setcancelstate_stub(int, int *);
270: int __libc_thr_equal_stub(pthread_t, pthread_t);
271: unsigned int __libc_thr_curcpu_stub(void);
272: __END_DECLS
273:
1.10 nathanw 274: #endif /* __LIBC_THREAD_STUBS */
1.7 thorpej 275:
1.9 nathanw 276: #define FLOCKFILE(fp) __flockfile_internal(fp, 1)
277: #define FUNLOCKFILE(fp) __funlockfile_internal(fp, 1)
1.7 thorpej 278:
279: #else /* _REENTRANT */
280:
1.18 ! christos 281: #ifndef __empty
! 282: #define __empty do {} while (/*CONSTCOND*/0)
! 283: #endif
! 284: #define mutex_init(m, a) __empty
! 285: #define mutex_lock(m) __empty
! 286: #define mutex_trylock(m) __empty
! 287: #define mutex_unlock(m) __empty
! 288: #define mutex_destroy(m) __empty
! 289:
! 290: #define cond_init(c, t, a) __empty
! 291: #define cond_signal(c) __empty
! 292: #define cond_broadcast(c) __empty
! 293: #define cond_wait(c, m) __empty
! 294: #define cond_timedwait(c, m, t) __empty
! 295: #define cond_destroy(c) __empty
! 296:
! 297: #define rwlock_init(l, a) __empty
! 298: #define rwlock_rdlock(l) __empty
! 299: #define rwlock_wrlock(l) __empty
! 300: #define rwlock_tryrdlock(l) __empty
! 301: #define rwlock_trywrlock(l) __empty
! 302: #define rwlock_unlock(l) __empty
! 303: #define rwlock_destroy(l) __empty
! 304:
! 305: #define thr_keycreate(k, d) /*LINTED*/0
! 306: #define thr_setspecific(k, p) __empty
! 307: #define thr_getspecific(k) /*LINTED*/0
! 308: #define thr_keydelete(k) __empty
! 309:
! 310: #define mutexattr_init(ma) __empty
! 311: #define mutexattr_settype(ma, t) __empty
! 312: #define mutexattr_destroy(ma) __empty
1.7 thorpej 313:
1.15 joerg 314: static inline int
315: thr_once(once_t *once_control, void (*routine)(void))
316: {
317: if (__predict_false(once_control->pto_done == 0)) {
318: (*routine)();
319: once_control->pto_done = 1;
320: }
321: return 0;
322: }
1.18 ! christos 323: #define thr_sigsetmask(f, n, o) __empty
! 324: #define thr_self() __empty
! 325: #define thr_errno() __empty
1.11 ad 326: #define thr_curcpu() ((unsigned int)0)
1.2 jtc 327:
1.18 ! christos 328: #define FLOCKFILE(fp) __empty
! 329: #define FUNLOCKFILE(fp) __empty
1.1 jtc 330:
1.7 thorpej 331: #endif /* _REENTRANT */
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