Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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83 lines
3.1 KiB
83 lines
3.1 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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#ifndef UPB_PORT_ATOMIC_H_ |
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#define UPB_PORT_ATOMIC_H_ |
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#include "upb/port/def.inc" |
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#ifdef UPB_USE_C11_ATOMICS |
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// IWYU pragma: begin_exports |
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#include <stdatomic.h> |
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#include <stdbool.h> |
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// IWYU pragma: end_exports |
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#define upb_Atomic_Init(addr, val) atomic_init(addr, val) |
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#define upb_Atomic_Load(addr, order) atomic_load_explicit(addr, order) |
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#define upb_Atomic_Store(addr, val, order) \ |
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atomic_store_explicit(addr, val, order) |
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#define upb_Atomic_Add(addr, val, order) \ |
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atomic_fetch_add_explicit(addr, val, order) |
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#define upb_Atomic_Sub(addr, val, order) \ |
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atomic_fetch_sub_explicit(addr, val, order) |
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#define upb_Atomic_Exchange(addr, val, order) \ |
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atomic_exchange_explicit(addr, val, order) |
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#define upb_Atomic_CompareExchangeStrong(addr, expected, desired, \ |
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success_order, failure_order) \ |
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atomic_compare_exchange_strong_explicit(addr, expected, desired, \ |
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success_order, failure_order) |
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#define upb_Atomic_CompareExchangeWeak(addr, expected, desired, success_order, \ |
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failure_order) \ |
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atomic_compare_exchange_weak_explicit(addr, expected, desired, \ |
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success_order, failure_order) |
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#else // !UPB_USE_C11_ATOMICS |
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#include <string.h> |
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#define upb_Atomic_Init(addr, val) (*addr = val) |
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#define upb_Atomic_Load(addr, order) (*addr) |
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#define upb_Atomic_Store(addr, val, order) (*(addr) = val) |
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#define upb_Atomic_Add(addr, val, order) (*(addr) += val) |
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#define upb_Atomic_Sub(addr, val, order) (*(addr) -= val) |
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UPB_INLINE void* _upb_NonAtomic_Exchange(void* addr, void* value) { |
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void* old; |
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memcpy(&old, addr, sizeof(value)); |
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memcpy(addr, &value, sizeof(value)); |
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return old; |
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} |
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#define upb_Atomic_Exchange(addr, val, order) _upb_NonAtomic_Exchange(addr, val) |
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// `addr` and `expected` are logically double pointers. |
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UPB_INLINE bool _upb_NonAtomic_CompareExchangeStrongP(void* addr, |
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void* expected, |
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void* desired) { |
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if (memcmp(addr, expected, sizeof(desired)) == 0) { |
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memcpy(addr, &desired, sizeof(desired)); |
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return true; |
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} else { |
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memcpy(expected, addr, sizeof(desired)); |
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return false; |
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} |
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} |
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#define upb_Atomic_CompareExchangeStrong(addr, expected, desired, \ |
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success_order, failure_order) \ |
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_upb_NonAtomic_CompareExchangeStrongP((void*)addr, (void*)expected, \ |
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(void*)desired) |
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#define upb_Atomic_CompareExchangeWeak(addr, expected, desired, success_order, \ |
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failure_order) \ |
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upb_Atomic_CompareExchangeStrong(addr, expected, desired, 0, 0) |
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#endif |
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#include "upb/port/undef.inc" |
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#endif // UPB_PORT_ATOMIC_H_
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