1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #include "log_print.h"
17 #include "runtime_context_impl.h"
18 #include "version.h"
19 
20 namespace DistributedDB {
GetInstance()21 RuntimeContext *RuntimeContext::GetInstance()
22 {
23     static std::mutex instLock_;
24     static std::atomic<RuntimeContext *> instPtr = nullptr;
25     // For Double-Checked Locking, we need check insPtr twice
26     if (instPtr == nullptr) {
27         std::lock_guard<std::mutex> lock(instLock_);
28         if (instPtr == nullptr) {
29             instPtr = new RuntimeContextImpl();
30             LOGI("DistributedDB Version : %s", SOFTWARE_VERSION_STRING);
31         }
32     }
33     return instPtr;
34 }
35 } // namespace DistributedDB
36