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67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
/*
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* Copyright 2016 Facebook, Inc.
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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 <climits>
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#include <functional>
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#include <stdexcept>
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#include <folly/Function.h>
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namespace folly {
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using Func = Function<void()>;
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/// An Executor accepts units of work with add(), which should be
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/// threadsafe.
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class Executor {
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public:
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virtual ~Executor() = default;
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/// Enqueue a function to executed by this executor. This and all
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/// variants must be threadsafe.
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virtual void add(Func) = 0;
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/// Enqueue a function with a given priority, where 0 is the medium priority
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/// This is up to the implementation to enforce
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virtual void addWithPriority(Func, int8_t /*priority*/) {
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throw std::runtime_error(
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"addWithPriority() is not implemented for this Executor");
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}
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virtual uint8_t getNumPriorities() const {
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return 1;
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}
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static const int8_t LO_PRI = SCHAR_MIN;
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static const int8_t MID_PRI = 0;
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static const int8_t HI_PRI = SCHAR_MAX;
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/// A convenience function for shared_ptr to legacy functors.
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///
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/// Sometimes you have a functor that is move-only, and therefore can't be
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/// converted to a std::function (e.g. std::packaged_task). In that case,
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/// wrap it in a shared_ptr (or maybe folly::MoveWrapper) and use this.
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template <class P>
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void addPtr(P fn) {
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this->add([fn]() mutable { (*fn)(); });
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}
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};
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} // folly
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