2 * Copyright 2010-2015 Samy Al Bahra.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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27 #ifndef CK_SPINLOCK_FAS_H
28 #define CK_SPINLOCK_FAS_H
30 #include <ck_backoff.h>
34 #include <ck_stdbool.h>
36 #ifndef CK_F_SPINLOCK_FAS
37 #define CK_F_SPINLOCK_FAS
39 struct ck_spinlock_fas {
42 typedef struct ck_spinlock_fas ck_spinlock_fas_t;
44 #define CK_SPINLOCK_FAS_INITIALIZER {false}
46 CK_CC_INLINE static void
47 ck_spinlock_fas_init(struct ck_spinlock_fas *lock)
55 CK_CC_INLINE static bool
56 ck_spinlock_fas_trylock(struct ck_spinlock_fas *lock)
60 value = ck_pr_fas_uint(&lock->value, true);
66 CK_CC_INLINE static bool
67 ck_spinlock_fas_locked(struct ck_spinlock_fas *lock)
71 r = ck_pr_load_uint(&lock->value);
72 ck_pr_fence_acquire();
76 CK_CC_INLINE static void
77 ck_spinlock_fas_lock(struct ck_spinlock_fas *lock)
80 while (ck_pr_fas_uint(&lock->value, true) == true) {
81 while (ck_pr_load_uint(&lock->value) == true)
89 CK_CC_INLINE static void
90 ck_spinlock_fas_lock_eb(struct ck_spinlock_fas *lock)
92 ck_backoff_t backoff = CK_BACKOFF_INITIALIZER;
94 while (ck_pr_fas_uint(&lock->value, true) == true)
95 ck_backoff_eb(&backoff);
101 CK_CC_INLINE static void
102 ck_spinlock_fas_unlock(struct ck_spinlock_fas *lock)
105 ck_pr_fence_unlock();
106 ck_pr_store_uint(&lock->value, false);
110 CK_ELIDE_PROTOTYPE(ck_spinlock_fas, ck_spinlock_fas_t,
111 ck_spinlock_fas_locked, ck_spinlock_fas_lock,
112 ck_spinlock_fas_locked, ck_spinlock_fas_unlock)
114 CK_ELIDE_TRYLOCK_PROTOTYPE(ck_spinlock_fas, ck_spinlock_fas_t,
115 ck_spinlock_fas_locked, ck_spinlock_fas_trylock)
117 #endif /* CK_F_SPINLOCK_FAS */
118 #endif /* CK_SPINLOCK_FAS_H */