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 "semaphore_utils.h"
17
18 #include <functional>
19
20 namespace DistributedDB {
21 using std::unique_lock;
22 using std::lock_guard;
23 using std::mutex;
24 using std::condition_variable;
25
SemaphoreUtils(int count)26 SemaphoreUtils::SemaphoreUtils(int count)
27 : count_(count)
28 {}
29
~SemaphoreUtils()30 SemaphoreUtils::~SemaphoreUtils()
31 {}
32
WaitSemaphore(int waitSecond)33 bool SemaphoreUtils::WaitSemaphore(int waitSecond)
34 {
35 unique_lock<mutex> lock(lockMutex_);
36 bool result = cv_.wait_for(lock, std::chrono::seconds(waitSecond),
37 std::bind(&SemaphoreUtils::CompareCount, this));
38 if (result == true) {
39 --count_;
40 }
41 return result;
42 }
43
WaitSemaphore()44 void SemaphoreUtils::WaitSemaphore()
45 {
46 unique_lock<mutex> lock(lockMutex_);
47 cv_.wait(lock, std::bind(&SemaphoreUtils::CompareCount, this));
48 --count_;
49 }
50
SendSemaphore()51 void SemaphoreUtils::SendSemaphore()
52 {
53 lock_guard<std::mutex> lock(lockMutex_);
54 count_++;
55 cv_.notify_one();
56 }
57
CompareCount() const58 bool SemaphoreUtils::CompareCount() const
59 {
60 return count_ > 0;
61 }
62 } // namespace DistributedDB
63