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/*
* Copyright 2010-2015 Samy Al Bahra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef CK_SPINLOCK_FAS_H
#define CK_SPINLOCK_FAS_H
#include <ck_backoff.h>
#include <ck_cc.h>
#include <ck_elide.h>
#include <ck_pr.h>
#include <ck_stdbool.h>
#ifndef CK_F_SPINLOCK_FAS
#define CK_F_SPINLOCK_FAS
struct ck_spinlock_fas {
unsigned int value;
};
typedef struct ck_spinlock_fas ck_spinlock_fas_t;
#define CK_SPINLOCK_FAS_INITIALIZER {false}
CK_CC_INLINE static void
ck_spinlock_fas_init(struct ck_spinlock_fas *lock)
{
lock->value = false;
ck_pr_barrier();
return;
}
CK_CC_INLINE static bool
ck_spinlock_fas_trylock(struct ck_spinlock_fas *lock)
{
bool value;
value = ck_pr_fas_uint(&lock->value, true);
ck_pr_fence_lock();
return !value;
}
CK_CC_INLINE static bool
ck_spinlock_fas_locked(struct ck_spinlock_fas *lock)
{
bool r;
r = ck_pr_load_uint(&lock->value);
ck_pr_fence_acquire();
return r;
}
CK_CC_INLINE static void
ck_spinlock_fas_lock(struct ck_spinlock_fas *lock)
{
while (CK_CC_UNLIKELY(ck_pr_fas_uint(&lock->value, true) == true)) {
do {
ck_pr_stall();
} while (ck_pr_load_uint(&lock->value) == true);
}
ck_pr_fence_lock();
return;
}
CK_CC_INLINE static void
ck_spinlock_fas_lock_eb(struct ck_spinlock_fas *lock)
{
ck_backoff_t backoff = CK_BACKOFF_INITIALIZER;
while (ck_pr_fas_uint(&lock->value, true) == true)
ck_backoff_eb(&backoff);
ck_pr_fence_lock();
return;
}
CK_CC_INLINE static void
ck_spinlock_fas_unlock(struct ck_spinlock_fas *lock)
{
ck_pr_fence_unlock();
ck_pr_store_uint(&lock->value, false);
return;
}
CK_ELIDE_PROTOTYPE(ck_spinlock_fas, ck_spinlock_fas_t,
ck_spinlock_fas_locked, ck_spinlock_fas_lock,
ck_spinlock_fas_locked, ck_spinlock_fas_unlock)
CK_ELIDE_TRYLOCK_PROTOTYPE(ck_spinlock_fas, ck_spinlock_fas_t,
ck_spinlock_fas_locked, ck_spinlock_fas_trylock)
#endif /* CK_F_SPINLOCK_FAS */
#endif /* CK_SPINLOCK_FAS_H */
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