diff options
Diffstat (limited to 'src/mongo/util/thread_safety_context.cpp')
-rw-r--r-- | src/mongo/util/thread_safety_context.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/mongo/util/thread_safety_context.cpp b/src/mongo/util/thread_safety_context.cpp new file mode 100644 index 00000000000..1b40c2746c5 --- /dev/null +++ b/src/mongo/util/thread_safety_context.cpp @@ -0,0 +1,59 @@ +/** + * 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. + */ + +#include "mongo/util/thread_safety_context.h" + +#include "mongo/platform/compiler.h" +#include "mongo/util/assert_util.h" + +namespace mongo { + +ThreadSafetyContext* ThreadSafetyContext::getThreadSafetyContext() noexcept { + static auto safetyContext = new ThreadSafetyContext(); // Intentionally leaked + return safetyContext; +} + +void ThreadSafetyContext::forbidMultiThreading() noexcept { + invariant(_isSingleThreaded.load()); + invariant(_safeToCreateThreads.swap(false)); +} + +void ThreadSafetyContext::allowMultiThreading() noexcept { + invariant(_isSingleThreaded.load()); + invariant(!_safeToCreateThreads.swap(true)); +} + +void ThreadSafetyContext::onThreadCreate() noexcept { + invariant(_safeToCreateThreads.load()); + if (MONGO_unlikely(_isSingleThreaded.load())) { + _isSingleThreaded.store(false); + } +} + +} // namespace mongo |