1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
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8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * libcfs/libcfs/user-lock.c
38 * Author: Nikita Danilov <nikita@clusterfs.com>
41 /* Implementations of portable synchronization APIs for liblustre */
44 * liblustre is single-threaded, so most "synchronization" APIs are trivial.
46 * XXX Liang: There are several branches share lnet with b_hd_newconfig,
47 * if we define lock APIs at here, there will be conflict with liblustre
53 #include <libcfs/libcfs.h>
56 * Optional debugging (magic stamping and checking ownership) can be added.
64 * - spin_lock_nested(x, subclass)
68 * - spin_lock_irqsave(x, f)
69 * - spin_unlock_irqrestore(x, f)
71 * No-op implementation.
74 void spin_lock_init(spinlock_t *lock)
76 LASSERT(lock != NULL);
80 void spin_lock(spinlock_t *lock)
85 void spin_lock_nested(spinlock_t *lock, unsigned int subclass)
91 void spin_unlock(spinlock_t *lock)
96 int spin_trylock(spinlock_t *lock)
102 void spin_lock_bh_init(spinlock_t *lock)
104 LASSERT(lock != NULL);
108 void spin_lock_bh(spinlock_t *lock)
110 LASSERT(lock != NULL);
114 void spin_unlock_bh(spinlock_t *lock)
116 LASSERT(lock != NULL);
128 void sema_init(struct semaphore *s, int val)
135 void __down(struct semaphore *s)
141 void __up(struct semaphore *s)
151 * - init_completion(c)
153 * - wait_for_completion(c)
156 void init_completion(struct completion *c)
160 cfs_waitq_init(&c->wait);
163 void complete(struct completion *c)
167 cfs_waitq_signal(&c->wait);
170 void wait_for_completion(struct completion *c)
175 int wait_for_completion_interruptible(struct completion *c)
192 void init_rwsem(struct rw_semaphore *s)
198 void down_read(struct rw_semaphore *s)
204 int down_read_trylock(struct rw_semaphore *s)
211 void down_write(struct rw_semaphore *s)
217 int down_write_trylock(struct rw_semaphore *s)
224 void up_read(struct rw_semaphore *s)
230 void up_write(struct rw_semaphore *s)
236 #ifdef HAVE_LIBPTHREAD
242 void cfs_init_completion(struct cfs_completion *c)
246 pthread_mutex_init(&c->c_mut, NULL);
247 pthread_cond_init(&c->c_cond, NULL);
250 void cfs_fini_completion(struct cfs_completion *c)
253 pthread_mutex_destroy(&c->c_mut);
254 pthread_cond_destroy(&c->c_cond);
257 void cfs_complete(struct cfs_completion *c)
260 pthread_mutex_lock(&c->c_mut);
262 pthread_cond_signal(&c->c_cond);
263 pthread_mutex_unlock(&c->c_mut);
266 void cfs_wait_for_completion(struct cfs_completion *c)
269 pthread_mutex_lock(&c->c_mut);
270 while (c->c_done == 0)
271 pthread_cond_wait(&c->c_cond, &c->c_mut);
273 pthread_mutex_unlock(&c->c_mut);
280 static pthread_mutex_t atomic_guard_lock = PTHREAD_MUTEX_INITIALIZER;
282 int cfs_atomic_read(cfs_atomic_t *a)
286 pthread_mutex_lock(&atomic_guard_lock);
288 pthread_mutex_unlock(&atomic_guard_lock);
292 void cfs_atomic_set(cfs_atomic_t *a, int b)
294 pthread_mutex_lock(&atomic_guard_lock);
296 pthread_mutex_unlock(&atomic_guard_lock);
299 int cfs_atomic_dec_and_test(cfs_atomic_t *a)
303 pthread_mutex_lock(&atomic_guard_lock);
305 pthread_mutex_unlock(&atomic_guard_lock);
309 void cfs_atomic_inc(cfs_atomic_t *a)
311 pthread_mutex_lock(&atomic_guard_lock);
313 pthread_mutex_unlock(&atomic_guard_lock);
316 void cfs_atomic_dec(cfs_atomic_t *a)
318 pthread_mutex_lock(&atomic_guard_lock);
320 pthread_mutex_unlock(&atomic_guard_lock);
322 void cfs_atomic_add(int b, cfs_atomic_t *a)
325 pthread_mutex_lock(&atomic_guard_lock);
327 pthread_mutex_unlock(&atomic_guard_lock);
330 void cfs_atomic_sub(int b, cfs_atomic_t *a)
332 pthread_mutex_lock(&atomic_guard_lock);
334 pthread_mutex_unlock(&atomic_guard_lock);
337 #endif /* HAVE_LIBPTHREAD */
345 * c-indentation-style: "K&R"