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/**
* Copyright (C) 2018-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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/s/config/namespace_serializer.h"
#include <map>
#include <memory>
#include <string>
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/s/config/sharding_catalog_manager.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
NamespaceSerializer::NamespaceSerializer() {}
NamespaceSerializer::ScopedLock::ScopedLock(StringData ns, NamespaceSerializer& nsSerializer)
: _ns(ns.toString()), _nsSerializer(nsSerializer) {}
NamespaceSerializer::ScopedLock::~ScopedLock() {
stdx::unique_lock<Latch> lock(_nsSerializer._mutex);
auto iter = _nsSerializer._inProgressMap.find(_ns);
iter->second->numWaiting--;
iter->second->isInProgress = false;
iter->second->cvLocked.notify_all();
if (iter->second->numWaiting == 0) {
_nsSerializer._inProgressMap.erase(_ns);
}
}
NamespaceSerializer::ScopedLock NamespaceSerializer::lock(OperationContext* opCtx, StringData nss) {
stdx::unique_lock<Latch> lock(_mutex);
auto iter = _inProgressMap.find(nss);
if (iter == _inProgressMap.end()) {
_inProgressMap.try_emplace(nss, std::make_shared<NSLock>());
} else {
auto nsLock = iter->second;
nsLock->numWaiting++;
auto guard = makeGuard([&] { nsLock->numWaiting--; });
opCtx->waitForConditionOrInterrupt(
nsLock->cvLocked, lock, [nsLock]() { return !nsLock->isInProgress; });
guard.dismiss();
nsLock->isInProgress = true;
}
return ScopedLock(nss, *this);
}
} // namespace mongo
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