47 lines
1.6 KiB
C
47 lines
1.6 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 <folly/Executor.h>
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namespace folly {
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class EventBase;
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} // namespace folly
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namespace folly {
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// An IOExecutor is an executor that operates on at least one EventBase. One of
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// these EventBases should be accessible via getEventBase(). The event base
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// returned by a call to getEventBase() is implementation dependent.
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//
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// Note that IOExecutors don't necessarily loop on the base themselves - for
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// instance, EventBase itself is an IOExecutor but doesn't drive itself.
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//
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// Implementations of IOExecutor are eligible to become the global IO executor,
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// returned on every call to getIOExecutor(), via setIOExecutor().
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// These functions are declared in GlobalExecutor.h
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//
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// If getIOExecutor is called and none has been set, a default global
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// IOThreadPoolExecutor will be created and returned.
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class IOExecutor : public virtual folly::Executor {
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public:
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~IOExecutor() override = default;
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virtual folly::EventBase* getEventBase() = 0;
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};
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} // namespace folly
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