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author | Ben Caimano <ben.caimano@10gen.com> | 2020-09-23 04:03:43 +0000 |
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committer | Evergreen Agent <no-reply@evergreen.mongodb.com> | 2020-11-17 01:16:21 +0000 |
commit | 7aa2cf8d9f28e7d45674c1917079e4be40268de1 (patch) | |
tree | d8c460abbaff4c3f5ebabbbaf9b5735322f83f5c /src/mongo/db/client_strand.cpp | |
parent | 8606f356c4af4bb2fc279195132d3a8530d14305 (diff) | |
download | mongo-7aa2cf8d9f28e7d45674c1917079e4be40268de1.tar.gz |
SERVER-51278 Introduced ClientStrand
Diffstat (limited to 'src/mongo/db/client_strand.cpp')
-rw-r--r-- | src/mongo/db/client_strand.cpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/mongo/db/client_strand.cpp b/src/mongo/db/client_strand.cpp new file mode 100644 index 00000000000..1455485ebf9 --- /dev/null +++ b/src/mongo/db/client_strand.cpp @@ -0,0 +1,95 @@ +/** + * Copyright (C) 2020-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_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault + +#include "mongo/platform/basic.h" + +#include "mongo/db/client_strand.h" + +#include "mongo/logv2/log.h" +#include "mongo/util/concurrency/thread_name.h" + +namespace mongo { +namespace { +struct ClientStrandData { + ClientStrand* strand = nullptr; +}; + +auto getClientStrandData = Client::declareDecoration<ClientStrandData>(); +} // namespace + +boost::intrusive_ptr<ClientStrand> ClientStrand::make(ServiceContext::UniqueClient client) { + auto strand = make_intrusive<ClientStrand>(std::move(client)); + getClientStrandData(strand->getClientPointer()).strand = strand.get(); + return strand; +} + +boost::intrusive_ptr<ClientStrand> ClientStrand::get(Client* client) { + return getClientStrandData(client).strand; +} + +void ClientStrand::_setCurrent() noexcept { + invariant(_isBound.load()); + invariant(_client); + + LOGV2_DEBUG( + 5127801, kDiagnosticLogLevel, "Setting the Client", "client"_attr = _client->desc()); + + // Set the Client for this thread so calls to Client::getCurrent() works as expected. + Client::setCurrent(std::move(_client)); + + // Set up the thread name. + auto oldThreadName = getThreadName(); + StringData threadName = _clientPtr->desc(); + if (oldThreadName != threadName) { + _oldThreadName = oldThreadName.toString(); + setThreadName(threadName); + LOGV2_DEBUG(5127802, kDiagnosticLogLevel, "Set thread name", "name"_attr = threadName); + } +} + +void ClientStrand::_releaseCurrent() noexcept { + invariant(_isBound.load()); + invariant(!_client); + + // Reclaim the client. + _client = Client::releaseCurrent(); + invariant(_client.get() == _clientPtr, kUnableToRecoverClient); + + if (!_oldThreadName.empty()) { + // Reset the old thread name. + setThreadName(_oldThreadName); + } + + LOGV2_DEBUG( + 5127803, kDiagnosticLogLevel, "Released the Client", "client"_attr = _client->desc()); +} + +} // namespace mongo |