48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/*
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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 <folly/CPortability.h>
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#include <folly/CppAttributes.h>
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#include <folly/Executor.h>
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namespace folly {
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/// When work is "queued", execute it immediately inline.
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/// Usually when you think you want this, you actually want a
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/// QueuedImmediateExecutor.
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class InlineExecutor : public Executor {
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public:
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FOLLY_ERASE static InlineExecutor& instance() noexcept {
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auto const value = cache.load(std::memory_order_acquire);
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return value ? *value : instance_slow();
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}
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void add(Func f) override {
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f();
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}
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private:
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FOLLY_COLD static InlineExecutor& instance_slow() noexcept;
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static std::atomic<InlineExecutor*> cache;
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};
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} // namespace folly
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