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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <folly/Executor.h>
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#include <folly/Range.h>
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namespace folly {
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class ManualExecutor;
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}
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namespace facebook {
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namespace eden {
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/**
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* An Executor that is guaranteed to never block, nor throw (except OOM), nor
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* execute inline from `add()`.
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*
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* Parts of Eden rely on queuing a function to be non-blocking for deadlock
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* safety.
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*/
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class UnboundedQueueExecutor : public folly::Executor {
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public:
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/**
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* Instantiates with a folly::CPUThreadPoolExecutor with the given threadCount
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* and threadNamePrefix but with an unlimited queue.
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*/
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explicit UnboundedQueueExecutor(
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size_t threadCount,
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folly::StringPiece threadNamePrefix);
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/**
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* ManualExecutors are unbounded too.
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*
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* Used primarily for tests.
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*/
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explicit UnboundedQueueExecutor(
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std::shared_ptr<folly::ManualExecutor> executor);
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UnboundedQueueExecutor(const UnboundedQueueExecutor&) = delete;
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UnboundedQueueExecutor& operator=(const UnboundedQueueExecutor&) = delete;
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UnboundedQueueExecutor(UnboundedQueueExecutor&&) = delete;
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UnboundedQueueExecutor& operator=(UnboundedQueueExecutor&&) = delete;
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void add(folly::Func func) override {
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executor_->add(std::move(func));
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}
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private:
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std::shared_ptr<folly::Executor> executor_;
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};
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} // namespace eden
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} // namespace facebook
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