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/**
* Copyright (C) 2019-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/db/prepare_conflict_tracker.h"
#include "mongo/platform/basic.h"
namespace mongo {
const OperationContext::Decoration<PrepareConflictTracker> PrepareConflictTracker::get =
OperationContext::declareDecoration<PrepareConflictTracker>();
bool PrepareConflictTracker::isWaitingOnPrepareConflict() const {
return _waitOnPrepareConflict.load();
}
void PrepareConflictTracker::beginPrepareConflict(OperationContext* opCtx) {
// Implies that the current read operation is blocked on a prepared transaction.
_waitOnPrepareConflict.store(true);
invariant(_prepareConflictStartTime == 0);
_prepareConflictStartTime = opCtx->getServiceContext()->getTickSource()->getTicks();
}
void PrepareConflictTracker::endPrepareConflict(OperationContext* opCtx) {
if (_waitOnPrepareConflict.load()) {
auto tickSource = opCtx->getServiceContext()->getTickSource();
auto curTick = tickSource->getTicks();
invariant(_prepareConflictStartTime <= curTick,
str::stream() << "Prepare conflict start time ("
<< tickSource->ticksTo<Microseconds>(_prepareConflictStartTime)
<< ") is somehow greater than current time ("
<< tickSource->ticksTo<Microseconds>(curTick) << ")");
auto curConflictDuration =
tickSource->ticksTo<Microseconds>(curTick - _prepareConflictStartTime);
_prepareConflictDuration.store(_prepareConflictDuration.load() + curConflictDuration);
_prepareConflictStartTime = 0;
// Implies that the current read operation is not blocked on a prepared transaction.
_waitOnPrepareConflict.store(false);
}
invariant(_prepareConflictStartTime == 0);
}
Microseconds PrepareConflictTracker::getPrepareConflictDuration() {
return _prepareConflictDuration.load();
}
} // namespace mongo
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