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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/cancelable_operation_context.h"
#include "mongo/db/operation_context.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
CancelableOperationContext::CancelableOperationContext(ServiceContext::UniqueOperationContext opCtx,
const CancellationToken& cancelToken,
ExecutorPtr executor)
: _sharedBlock{std::make_shared<SharedBlock>()},
_opCtx{std::move(opCtx)},
_markKilledFinished{[&] {
if (cancelToken.isCanceled()) {
// This thread owns _opCtx so it isn't necessary to acquire the Client mutex.
_opCtx->markKilled(ErrorCodes::Interrupted);
return makeReadyFutureWith([] {}).semi();
}
return cancelToken.onCancel()
.thenRunOn(std::move(executor))
.then([sharedBlock = _sharedBlock, opCtx = _opCtx.get()] {
if (!sharedBlock->done.swap(true)) {
stdx::lock_guard<Client> lk(*opCtx->getClient());
opCtx->markKilled(ErrorCodes::Interrupted);
}
})
.semi();
}()} {}
CancelableOperationContext::~CancelableOperationContext() {
if (_sharedBlock->done.swap(true)) {
// _sharedBlock->done was already true so our onCancel() continuation must have started to
// run. We must wait for it to finish running to avoid markKilled() being called while the
// OperationContext is being destructed.
_markKilledFinished.wait();
}
}
} // namespace mongo
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