12581d4aaSFrançois Tigeot /*
2*ef50770eSFrançois Tigeot * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
32581d4aaSFrançois Tigeot * All rights reserved.
42581d4aaSFrançois Tigeot *
52581d4aaSFrançois Tigeot * Redistribution and use in source and binary forms, with or without
62581d4aaSFrançois Tigeot * modification, are permitted provided that the following conditions
72581d4aaSFrançois Tigeot * are met:
82581d4aaSFrançois Tigeot * 1. Redistributions of source code must retain the above copyright
92581d4aaSFrançois Tigeot * notice unmodified, this list of conditions, and the following
102581d4aaSFrançois Tigeot * disclaimer.
112581d4aaSFrançois Tigeot * 2. Redistributions in binary form must reproduce the above copyright
122581d4aaSFrançois Tigeot * notice, this list of conditions and the following disclaimer in the
132581d4aaSFrançois Tigeot * documentation and/or other materials provided with the distribution.
142581d4aaSFrançois Tigeot *
152581d4aaSFrançois Tigeot * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
162581d4aaSFrançois Tigeot * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
172581d4aaSFrançois Tigeot * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
182581d4aaSFrançois Tigeot * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
192581d4aaSFrançois Tigeot * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
202581d4aaSFrançois Tigeot * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
212581d4aaSFrançois Tigeot * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
222581d4aaSFrançois Tigeot * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
232581d4aaSFrançois Tigeot * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
242581d4aaSFrançois Tigeot * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
252581d4aaSFrançois Tigeot */
262581d4aaSFrançois Tigeot
272581d4aaSFrançois Tigeot #ifndef _LINUX_MUTEX_H_
282581d4aaSFrançois Tigeot #define _LINUX_MUTEX_H_
292581d4aaSFrançois Tigeot
30d6aa1cc5SFrançois Tigeot #include <asm/current.h>
31d6aa1cc5SFrançois Tigeot #include <linux/list.h>
32961a6190SFrançois Tigeot #include <linux/lockdep.h>
33d6aa1cc5SFrançois Tigeot #include <linux/atomic.h>
34c6002f72SFrançois Tigeot #include <asm/processor.h>
352581d4aaSFrançois Tigeot
363b6a19b2SMatthew Dillon #define mutex_is_locked(lock) (lockinuse(lock))
372581d4aaSFrançois Tigeot
38303d234dSFrançois Tigeot #define mutex_lock(lock) lockmgr(lock, LK_EXCLUSIVE)
39303d234dSFrançois Tigeot #define mutex_unlock(lock) lockmgr(lock, LK_RELEASE)
40303d234dSFrançois Tigeot
413558045eSSascha Wildner #define mutex_trylock(lock) lockmgr_try(lock, LK_EXCLUSIVE)
428634e73aSFrançois Tigeot
4317bbf32eSFrançois Tigeot static inline int
mutex_lock_interruptible(struct lock * lock)4417bbf32eSFrançois Tigeot mutex_lock_interruptible(struct lock *lock)
4517bbf32eSFrançois Tigeot {
46beb32878SFrançois Tigeot if (lockmgr(lock, LK_EXCLUSIVE|LK_SLEEPFAIL|LK_PCATCH))
4717bbf32eSFrançois Tigeot return -EINTR;
4817bbf32eSFrançois Tigeot
4917bbf32eSFrançois Tigeot return 0;
5017bbf32eSFrançois Tigeot }
518634e73aSFrançois Tigeot
52115eefbdSFrançois Tigeot #define DEFINE_MUTEX(mutex) \
53115eefbdSFrançois Tigeot struct lock mutex; \
54115eefbdSFrançois Tigeot LOCK_SYSINIT(mutex, &mutex, "lmutex", LK_CANRECURSE)
55115eefbdSFrançois Tigeot
5639cfddd2SFrançois Tigeot static inline void
mutex_destroy(struct lock * mutex)5739cfddd2SFrançois Tigeot mutex_destroy(struct lock *mutex)
5839cfddd2SFrançois Tigeot {
5939cfddd2SFrançois Tigeot lockuninit(mutex);
6039cfddd2SFrançois Tigeot }
6139cfddd2SFrançois Tigeot
62*ef50770eSFrançois Tigeot #define mutex_lock_nested(lock, unused) mutex_lock(lock)
63*ef50770eSFrançois Tigeot
64*ef50770eSFrançois Tigeot enum mutex_trylock_recursive_enum {
65*ef50770eSFrançois Tigeot MUTEX_TRYLOCK_FAILED = 0,
66*ef50770eSFrançois Tigeot MUTEX_TRYLOCK_SUCCESS = 1,
67*ef50770eSFrançois Tigeot MUTEX_TRYLOCK_RECURSIVE,
68*ef50770eSFrançois Tigeot };
69*ef50770eSFrançois Tigeot
70*ef50770eSFrançois Tigeot static inline enum mutex_trylock_recursive_enum
mutex_trylock_recursive(struct lock * lock)71*ef50770eSFrançois Tigeot mutex_trylock_recursive(struct lock *lock)
72*ef50770eSFrançois Tigeot {
73*ef50770eSFrançois Tigeot if (lockowned(lock))
74*ef50770eSFrançois Tigeot return MUTEX_TRYLOCK_RECURSIVE;
75*ef50770eSFrançois Tigeot
76*ef50770eSFrançois Tigeot if (mutex_trylock(lock))
77*ef50770eSFrançois Tigeot return MUTEX_TRYLOCK_SUCCESS;
78*ef50770eSFrançois Tigeot
79*ef50770eSFrançois Tigeot return MUTEX_TRYLOCK_FAILED;
80*ef50770eSFrançois Tigeot }
81*ef50770eSFrançois Tigeot
822581d4aaSFrançois Tigeot #endif /* _LINUX_MUTEX_H_ */
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