93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <atomic>
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#include <cstdint>
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namespace folly {
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// atomic_compare_exchange_weak_explicit
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//
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// Fix TSAN bug in std::atomic_compare_exchange_weak_explicit.
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// Workaround for https://github.com/google/sanitizers/issues/970.
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//
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// mimic: std::atomic_compare_exchange_weak
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template <typename T>
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bool atomic_compare_exchange_weak_explicit(
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std::atomic<T>* obj,
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T* expected,
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T desired,
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std::memory_order succ,
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std::memory_order fail);
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// atomic_compare_exchange_strong_explicit
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//
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// Fix TSAN bug in std::atomic_compare_exchange_strong_explicit.
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// Workaround for https://github.com/google/sanitizers/issues/970.
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//
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// mimic: std::atomic_compare_exchange_strong
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template <typename T>
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bool atomic_compare_exchange_strong_explicit(
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std::atomic<T>* obj,
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T* expected,
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T desired,
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std::memory_order succ,
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std::memory_order fail);
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// atomic_fetch_set
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//
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// Sets the bit at the given index in the binary representation of the integer
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// to 1. Returns the previous value of the bit, which is equivalent to whether
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// that bit is unchanged.
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//
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// Equivalent to Atomic::fetch_or with a mask. For example, if the bit
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// argument to this function is 1, the mask passed to the corresponding
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// Atomic::fetch_or would be 0b1.
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//
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// Uses an optimized implementation when available, otherwise falling back to
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// Atomic::fetch_or with mask. The optimization is currently available for
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// std::atomic on x86, using the bts instruction.
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template <typename Atomic>
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bool atomic_fetch_set(
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Atomic& atomic,
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std::size_t bit,
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std::memory_order order = std::memory_order_seq_cst);
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// atomic_fetch_reset
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//
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// Resets the bit at the given index in the binary representation of the
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// integer to 0. Returns the previous value of the bit, which is equivalent to
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// whether that bit is changed.
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//
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// Equivalent to Atomic::fetch_and with a mask. For example, if the bit
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// argument to this function is 1, the mask passed to the corresponding
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// Atomic::fetch_and would be ~0b1.
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//
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// Uses an optimized implementation when available, otherwise falling back to
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// Atomic::fetch_and with mask. The optimization is currently available for
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// std::atomic on x86, using the btr instruction.
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template <typename Atomic>
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bool atomic_fetch_reset(
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Atomic& atomic,
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std::size_t bit,
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std::memory_order order = std::memory_order_seq_cst);
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} // namespace folly
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#include <folly/synchronization/AtomicUtil-inl.h>
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