80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
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/*
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* Copyright 2020 Joshua Ashton for Valve Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef __VKD3D_ATOMIC_H
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#define __VKD3D_ATOMIC_H
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#include <stdint.h>
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#if defined(_MSC_VER)
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# include <intrin.h>
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typedef enum
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{
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memory_order_relaxed,
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memory_order_acquire,
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memory_order_release,
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memory_order_acq_rel,
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} memory_order;
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# define vkd3d_atomic_rw_barrier() _ReadWriteBarrier()
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# define vkd3d_atomic_rw_barrier_acquire(order) { if (order == memory_order_acquire || order == memory_order_acq_rel) { vkd3d_atomic_rw_barrier(); } }
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# define vkd3d_atomic_rw_barrier_release(order) { if (order == memory_order_release || order == memory_order_acq_rel) { vkd3d_atomic_rw_barrier(); } }
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FORCEINLINE uint32_t vkd3d_uint32_atomic_load_explicit(uint32_t *target, memory_order order)
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{
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uint32_t value = *((volatile uint32_t*)target);
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vkd3d_atomic_rw_barrier_acquire(order);
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return value;
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}
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FORCEINLINE void vkd3d_uint32_atomic_store_explicit(uint32_t *target, uint32_t value, memory_order order)
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{
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vkd3d_atomic_rw_barrier_release(order);
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*((volatile uint32_t*)target) = value;
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}
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FORCEINLINE uint32_t vkd3d_uint32_atomic_exchange_explicit(uint32_t *target, uint32_t value, memory_order order)
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{
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vkd3d_atomic_rw_barrier_release(order);
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uint32_t oldValue = InterlockedExchange((LONG*)target, value);
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vkd3d_atomic_rw_barrier_acquire(order);
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return oldValue;
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}
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#elif defined(__GNUC__) || defined(__clang__)
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# include <stdatomic.h>
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# define vkd3d_uint32_atomic_load_explicit(target, order) atomic_load_explicit(target, order)
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# define vkd3d_uint32_atomic_store_explicit(target, value, order) atomic_store_explicit(target, value, order)
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# define vkd3d_uint32_atomic_exchange_explicit(target, value, order) atomic_exchange_explicit(target, value, order)
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/* Unfortunately only fetch_add is in stdatomic
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* so use the common GCC extensions for these. */
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# define InterlockedIncrement(target) __atomic_add_fetch(target, 1, memory_order_seq_cst)
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# define InterlockedDecrement(target) __atomic_sub_fetch(target, 1, memory_order_seq_cst)
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#else
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# error "No atomics for this platform"
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#endif
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#endif
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