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/* Copyright (C) 2024 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*!
* \brief C11 atomic operations with fallbacks.
*/
#pragma once
#ifdef HAVE_C11_ATOMIC /* C11 */
#include <stdatomic.h>
#define ATOMIC_INIT(dst, val) atomic_store_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_DEINIT(dst)
#define ATOMIC_SET(dst, val) atomic_store_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_GET(src) atomic_load_explicit(&(src), memory_order_relaxed)
#define ATOMIC_ADD(dst, val) (void)atomic_fetch_add_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_SUB(dst, val) (void)atomic_fetch_sub_explicit(&(dst), (val), memory_order_relaxed)
#define ATOMIC_XCHG(dst, val) atomic_exchange_explicit(&(dst), (val), memory_order_relaxed)
typedef atomic_uint_fast16_t knot_atomic_uint16_t;
typedef atomic_uint_fast64_t knot_atomic_uint64_t;
typedef atomic_size_t knot_atomic_size_t;
typedef _Atomic (void *) knot_atomic_ptr_t;
typedef atomic_bool knot_atomic_bool;
#elif defined(HAVE_GCC_ATOMIC) /* GCC __atomic */
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#define ATOMIC_INIT(dst, val) __atomic_store_n(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_DEINIT(dst)
#define ATOMIC_SET(dst, val) __atomic_store_n(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_GET(src) __atomic_load_n(&(src), __ATOMIC_RELAXED)
#define ATOMIC_ADD(dst, val) __atomic_add_fetch(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_SUB(dst, val) __atomic_sub_fetch(&(dst), (val), __ATOMIC_RELAXED)
#define ATOMIC_XCHG(dst, val) __atomic_exchange_n(&(dst), (val), __ATOMIC_RELAXED)
typedef uint16_t knot_atomic_uint16_t;
typedef uint64_t knot_atomic_uint64_t;
typedef size_t knot_atomic_size_t;
typedef void* knot_atomic_ptr_t;
typedef bool knot_atomic_bool;
#else /* Fallback using spinlocks. Much slower. */
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include "contrib/spinlock.h"
#define ATOMIC_SET(dst, val) ({ \
knot_spin_lock((knot_spin_t *)&(dst).lock); \
(dst).value.vol = (val); \
knot_spin_unlock((knot_spin_t *)&(dst).lock); \
})
#define ATOMIC_INIT(dst, val) ({ \
knot_spin_init((knot_spin_t *)&(dst).lock); \
ATOMIC_SET(dst, val); \
})
#define ATOMIC_DEINIT(dst) ({ \
knot_spin_destroy((knot_spin_t *)&(dst).lock); \
})
#define ATOMIC_GET(src) ({ \
knot_spin_lock((knot_spin_t *)&(src).lock); \
typeof((src).value.non_vol) _z = (typeof((src).value.non_vol))(src).value.vol; \
knot_spin_unlock((knot_spin_t *)&(src).lock); \
_z; \
})
#define ATOMIC_ADD(dst, val) ({ \
knot_spin_lock((knot_spin_t *)&(dst).lock); \
(dst).value.vol += (val); \
knot_spin_unlock((knot_spin_t *)&(dst).lock); \
})
#define ATOMIC_SUB(dst, val) ({ \
knot_spin_lock((knot_spin_t *)&(dst).lock); \
(dst).value.vol -= (val); \
knot_spin_unlock((knot_spin_t *)&(dst).lock); \
})
#define ATOMIC_XCHG(dst, val) ({ \
knot_spin_lock((knot_spin_t *)&(dst).lock); \
typeof((dst).value.non_vol) _z = (typeof((dst).value.non_vol))(dst).value.vol; \
(dst).value.vol = (val); \
knot_spin_unlock((knot_spin_t *)&(dst).lock); \
_z; \
})
#define ATOMIC_T(x) struct { \
knot_spin_t lock; \
union { \
volatile x vol; \
x non_vol; \
} value; \
}
typedef ATOMIC_T(uint16_t) knot_atomic_uint16_t;
typedef ATOMIC_T(uint64_t) knot_atomic_uint64_t;
typedef ATOMIC_T(size_t) knot_atomic_size_t;
typedef ATOMIC_T(void*) knot_atomic_ptr_t;
typedef ATOMIC_T(bool) knot_atomic_bool;
#endif
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