1 /*
2 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_MUTEX_H_
28 #define _LINUX_MUTEX_H_
29
30 #include <asm/current.h>
31 #include <linux/list.h>
32 #include <linux/lockdep.h>
33 #include <linux/atomic.h>
34 #include <asm/processor.h>
35
36 #define mutex_is_locked(lock) (lockinuse(lock))
37
38 #define mutex_lock(lock) lockmgr(lock, LK_EXCLUSIVE)
39 #define mutex_unlock(lock) lockmgr(lock, LK_RELEASE)
40
41 #define mutex_trylock(lock) lockmgr_try(lock, LK_EXCLUSIVE)
42
43 static inline int
mutex_lock_interruptible(struct lock * lock)44 mutex_lock_interruptible(struct lock *lock)
45 {
46 if (lockmgr(lock, LK_EXCLUSIVE|LK_SLEEPFAIL|LK_PCATCH))
47 return -EINTR;
48
49 return 0;
50 }
51
52 #define DEFINE_MUTEX(mutex) \
53 struct lock mutex; \
54 LOCK_SYSINIT(mutex, &mutex, "lmutex", LK_CANRECURSE)
55
56 static inline void
mutex_destroy(struct lock * mutex)57 mutex_destroy(struct lock *mutex)
58 {
59 lockuninit(mutex);
60 }
61
62 #define mutex_lock_nested(lock, unused) mutex_lock(lock)
63
64 enum mutex_trylock_recursive_enum {
65 MUTEX_TRYLOCK_FAILED = 0,
66 MUTEX_TRYLOCK_SUCCESS = 1,
67 MUTEX_TRYLOCK_RECURSIVE,
68 };
69
70 static inline enum mutex_trylock_recursive_enum
mutex_trylock_recursive(struct lock * lock)71 mutex_trylock_recursive(struct lock *lock)
72 {
73 if (lockowned(lock))
74 return MUTEX_TRYLOCK_RECURSIVE;
75
76 if (mutex_trylock(lock))
77 return MUTEX_TRYLOCK_SUCCESS;
78
79 return MUTEX_TRYLOCK_FAILED;
80 }
81
82 #endif /* _LINUX_MUTEX_H_ */
83