110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
/*
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* Copyright 2020 CM4all GmbH
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* All rights reserved.
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*
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* author: Max Kellermann <mk@cm4all.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Ring.hxx"
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#include "util/IntrusiveList.hxx"
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#include <liburing.h>
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namespace Uring {
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class Operation;
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class CancellableOperation;
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/**
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* High-level C++ wrapper for a `struct io_uring`. It supports a
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* handler class, cancellation, ...
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*/
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class Queue {
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Ring ring;
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IntrusiveList<CancellableOperation> operations;
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public:
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Queue(unsigned entries, unsigned flags);
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~Queue() noexcept;
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FileDescriptor GetFileDescriptor() const noexcept {
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return ring.GetFileDescriptor();
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}
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struct io_uring_sqe *GetSubmitEntry() noexcept {
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return ring.GetSubmitEntry();
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}
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/**
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* Like GetSubmitEntry(), but call Submit() if the submit
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* queue is full.
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*
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* May throw exceptions if Submit() fails.
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*/
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struct io_uring_sqe &RequireSubmitEntry();
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bool HasPending() const noexcept {
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return !operations.empty();
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}
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protected:
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void AddPending(struct io_uring_sqe &sqe,
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Operation &operation) noexcept;
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public:
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virtual void Push(struct io_uring_sqe &sqe,
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Operation &operation) noexcept {
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AddPending(sqe, operation);
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Submit();
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}
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void Submit() {
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ring.Submit();
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}
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bool DispatchOneCompletion();
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void DispatchCompletions() {
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while (DispatchOneCompletion()) {}
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}
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bool WaitDispatchOneCompletion();
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void WaitDispatchCompletions() {
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while (WaitDispatchOneCompletion()) {}
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}
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private:
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void DispatchOneCompletion(struct io_uring_cqe &cqe) noexcept;
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};
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} // namespace Uring
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