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/*
* Copyright 2020 CM4all GmbH
* All rights reserved.
*
* author: Max Kellermann <mk@cm4all.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Operation.hxx"
#include <boost/intrusive/list_hook.hpp>
#include <cassert>
#include <utility>
namespace Uring {
class CancellableOperation
: public boost::intrusive::list_base_hook<boost::intrusive::link_mode<boost::intrusive::normal_link>>
{
Operation *operation;
public:
CancellableOperation(Operation &_operation) noexcept
:operation(&_operation)
{
assert(operation->cancellable == nullptr);
operation->cancellable = this;
}
~CancellableOperation() noexcept {
assert(operation == nullptr);
}
void Cancel(Operation &_operation) noexcept {
(void)_operation;
assert(operation == &_operation);
operation = nullptr;
// TODO: io_uring_prep_cancel()
}
void Replace(Operation &old_operation,
Operation &new_operation) noexcept {
assert(operation == &old_operation);
assert(old_operation.cancellable == this);
old_operation.cancellable = nullptr;
operation = &new_operation;
new_operation.cancellable = this;
}
void OnUringCompletion(int res) noexcept {
if (operation == nullptr)
return;
assert(operation->cancellable == this);
operation->cancellable = nullptr;
std::exchange(operation, nullptr)->OnUringCompletion(res);
}
};
} // namespace Uring
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