257 lines
11 KiB
C
257 lines
11 KiB
C
/*
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* Copyright (c) 2018 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* This header provides some gory details to implement the <os/atomic_private.h>
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* interfaces. Nothing in this header should be called directly, no promise is
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* made to keep this interface stable.
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*/
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#ifndef __OS_ATOMIC_PRIVATE_H__
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#error "Do not include <os/atomic_private_impl.h> directly, use <os/atomic_private.h>"
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#endif
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#ifndef __OS_ATOMIC_PRIVATE_IMPL_H__
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#define __OS_ATOMIC_PRIVATE_IMPL_H__
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#pragma mark - implementation details
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static inline int
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_os_atomic_mo_has_acquire(OS_ATOMIC_STD memory_order ord)
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{
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switch (ord) {
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case os_atomic_std(memory_order_consume):
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case os_atomic_std(memory_order_acquire):
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case os_atomic_std(memory_order_acq_rel):
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case os_atomic_std(memory_order_seq_cst):
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return 1;
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default:
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return 0;
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}
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}
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static inline int
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_os_atomic_mo_has_release(OS_ATOMIC_STD memory_order ord)
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{
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switch (ord) {
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case os_atomic_std(memory_order_release):
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case os_atomic_std(memory_order_acq_rel):
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case os_atomic_std(memory_order_seq_cst):
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return 1;
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default:
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return 0;
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}
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}
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#define _os_atomic_mo_relaxed os_atomic_std(memory_order_relaxed)
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#define _os_atomic_mo_compiler_acquire os_atomic_std(memory_order_relaxed)
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#define _os_atomic_mo_compiler_release os_atomic_std(memory_order_relaxed)
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#define _os_atomic_mo_compiler_acq_rel os_atomic_std(memory_order_relaxed)
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#define _os_atomic_mo_consume os_atomic_std(memory_order_consume)
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_mo_dependency os_atomic_std(memory_order_acquire)
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_mo_acquire os_atomic_std(memory_order_acquire)
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#define _os_atomic_mo_release os_atomic_std(memory_order_release)
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#define _os_atomic_mo_acq_rel os_atomic_std(memory_order_acq_rel)
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#define _os_atomic_mo_seq_cst os_atomic_std(memory_order_seq_cst)
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/*
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* Mapping between symbolic memory orderings and actual ones
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* to take SMP into account.
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*/
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#if OS_ATOMIC_CONFIG_SMP
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#define _os_atomic_mo_relaxed_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_compiler_acquire_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_compiler_release_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_compiler_acq_rel_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_consume_smp _os_atomic_mo_consume
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_mo_dependency_smp _os_atomic_mo_dependency
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_mo_acquire_smp _os_atomic_mo_acquire
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#define _os_atomic_mo_release_smp _os_atomic_mo_release
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#define _os_atomic_mo_acq_rel_smp _os_atomic_mo_acq_rel
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#define _os_atomic_mo_seq_cst_smp _os_atomic_mo_seq_cst
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#else
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#define _os_atomic_mo_relaxed_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_compiler_acquire_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_compiler_release_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_compiler_acq_rel_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_consume_smp _os_atomic_mo_relaxed
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_mo_dependency_smp _os_atomic_mo_relaxed
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_mo_acquire_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_release_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_acq_rel_smp _os_atomic_mo_relaxed
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#define _os_atomic_mo_seq_cst_smp _os_atomic_mo_relaxed
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#endif
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#if KERNEL_PRIVATE
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#define memory_order_relaxed_smp _os_atomic_mo_relaxed_smp
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#define memory_order_compiler_acquire_smp _os_atomic_mo_compiler_acquire_smp
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#define memory_order_compiler_release_smp _os_atomic_mo_compiler_release_smp
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#define memory_order_compiler_acq_rel_smp _os_atomic_mo_compiler_acq_rel_smp
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#define memory_order_consume_smp _os_atomic_mo_consume_smp
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define memory_order_dependency _os_atomic_mo_dependency
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#define memory_order_dependency_smp _os_atomic_mo_dependency_smp
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define memory_order_acquire_smp _os_atomic_mo_acquire_smp
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#define memory_order_release_smp _os_atomic_mo_release_smp
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#define memory_order_acq_rel_smp _os_atomic_mo_acq_rel_smp
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#define memory_order_seq_cst_smp _os_atomic_mo_seq_cst_smp
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#endif
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/*
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* Hack needed for os_compiler_barrier() to work (including with empty argument)
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*/
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#define _os_compiler_barrier_relaxed _os_atomic_mo_relaxed
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#define _os_compiler_barrier_acquire _os_atomic_mo_acquire
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#define _os_compiler_barrier_release _os_atomic_mo_release
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#define _os_compiler_barrier_acq_rel _os_atomic_mo_acq_rel
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#define _os_compiler_barrier_ _os_atomic_mo_acq_rel
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/*
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* Mapping between compiler barrier/memory orders and:
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* - compiler barriers before atomics ("rel_barrier")
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* - compiler barriers after atomics ("acq_barrier")
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*/
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#define _os_rel_barrier_relaxed _os_atomic_mo_relaxed
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#define _os_rel_barrier_compiler_acquire _os_atomic_mo_relaxed
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#define _os_rel_barrier_compiler_release _os_atomic_mo_release
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#define _os_rel_barrier_compiler_acq_rel _os_atomic_mo_release
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#define _os_rel_barrier_consume _os_atomic_mo_relaxed
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_rel_barrier_dependency _os_atomic_mo_relaxed
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_rel_barrier_acquire _os_atomic_mo_relaxed
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#define _os_rel_barrier_release _os_atomic_mo_release
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#define _os_rel_barrier_acq_rel _os_atomic_mo_release
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#define _os_rel_barrier_seq_cst _os_atomic_mo_release
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#define _os_acq_barrier_relaxed _os_atomic_mo_relaxed
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#define _os_acq_barrier_compiler_acquire _os_atomic_mo_acquire
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#define _os_acq_barrier_compiler_release _os_atomic_mo_relaxed
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#define _os_acq_barrier_compiler_acq_rel _os_atomic_mo_acquire
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#define _os_acq_barrier_consume _os_atomic_mo_acquire
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_acq_barrier_dependency _os_atomic_mo_acquire
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_acq_barrier_acquire _os_atomic_mo_acquire
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#define _os_acq_barrier_release _os_atomic_mo_relaxed
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#define _os_acq_barrier_acq_rel _os_atomic_mo_acquire
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#define _os_acq_barrier_seq_cst _os_atomic_mo_acquire
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#define _os_compiler_barrier_before_atomic(m) \
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os_atomic_std(atomic_signal_fence)(_os_rel_barrier_##m)
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#define _os_compiler_barrier_after_atomic(m) \
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os_atomic_std(atomic_signal_fence)(_os_acq_barrier_##m)
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/*
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* Mapping between compiler barrier/memmory orders and:
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* - memory fences before atomics ("rel_fence")
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* - memory fences after atomics ("acq_fence")
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*/
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#define _os_rel_fence_relaxed _os_atomic_mo_relaxed
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#define _os_rel_fence_compiler_acquire _os_atomic_mo_relaxed
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#define _os_rel_fence_compiler_release _os_atomic_mo_release
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#define _os_rel_fence_compiler_acq_rel _os_atomic_mo_release
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#define _os_rel_fence_consume _os_atomic_mo_relaxed_smp
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_rel_fence_dependency _os_atomic_mo_relaxed_smp
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_rel_fence_acquire _os_atomic_mo_relaxed_smp
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#define _os_rel_fence_release _os_atomic_mo_release_smp
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#define _os_rel_fence_acq_rel _os_atomic_mo_release_smp
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#define _os_rel_fence_seq_cst _os_atomic_mo_release_smp
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#define _os_acq_fence_relaxed _os_atomic_mo_relaxed
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#define _os_acq_fence_compiler_acquire _os_atomic_mo_relaxed
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#define _os_acq_fence_compiler_release _os_atomic_mo_relaxed
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#define _os_acq_fence_compiler_acq_rel _os_atomic_mo_relaxed
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#define _os_acq_fence_consume _os_atomic_mo_acquire_smp
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_acq_fence_dependency _os_atomic_mo_dependency_smp
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_acq_fence_acquire _os_atomic_mo_acquire_smp
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#define _os_acq_fence_release _os_atomic_mo_relaxed_smp
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#define _os_acq_fence_acq_rel _os_atomic_mo_acquire_smp
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#define _os_acq_fence_seq_cst _os_atomic_mo_acquire_smp
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#define _os_memory_fence_before_atomic(m) \
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os_atomic_std(atomic_thread_fence)(_os_rel_fence_##m)
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#define _os_memory_fence_after_atomic(m) \
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os_atomic_std(atomic_thread_fence)(_os_acq_fence_##m)
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/*
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* Misc. helpers
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*/
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#define _os_atomic_value_cast(p, v) \
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({ __typeof__(*os_cast_to_nonatomic_pointer(p)) ___v = (v); ___v; })
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#define _os_atomic_c11_op_orig(p, v, m, o) ({ \
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_os_compiler_barrier_before_atomic(m); \
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__auto_type _r = os_atomic_std(atomic_##o##_explicit)(\
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os_cast_to_atomic_pointer(p), \
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_os_atomic_value_cast(p, v), \
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_os_atomic_mo_##m##_smp); \
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_os_compiler_barrier_after_atomic(m); \
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_r; \
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})
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#define _os_atomic_c11_op(p, v, m, o, op) ({ \
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__auto_type _v = _os_atomic_value_cast(p, v); \
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_os_atomic_c11_op_orig(p, _v, m, o) op _v; \
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})
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#define _os_atomic_clang_op_orig(p, v, m, o) ({ \
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_os_compiler_barrier_before_atomic(m); \
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__auto_type _r = __atomic_##o(os_cast_to_nonatomic_pointer(p), \
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_os_atomic_value_cast(p, v), \
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_os_atomic_mo_##m##_smp); \
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_os_compiler_barrier_after_atomic(m); \
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_r; \
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})
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#define _os_atomic_clang_op(p, v, m, o, op) ({ \
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__auto_type _v = _os_atomic_value_cast(p, v); \
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__auto_type _s = _os_atomic_clang_op_orig(p, _v, m, o); \
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op(_s, _v); \
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})
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#if OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#define _os_atomic_auto_dependency(e) \
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_Generic(e, \
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os_atomic_dependency_t: (e), \
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default: os_atomic_make_dependency(e))
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#endif // OS_ATOMIC_CONFIG_MEMORY_ORDER_DEPENDENCY
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#endif /* __OS_ATOMIC_PRIVATE_IMPL_H__ */
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