【C++编程】shared_mutex

std::shared_mutex

1. 原型：

 

读写锁属性相关理论：【Liux系统编程】读写锁

1）测试用例：

#include <iostream>
#include <mutex>
#include <shared_mutex>
#include <thread>

class ThreadSafeCounter {
 public:
  ThreadSafeCounter() = default;

  unsigned int get() const {
    std::shared_lock lock(mutex_);
    return value_;
  }

  unsigned int increment() {
    std::unique_lock lock(mutex_);
    return ++value_;
  }

  void reset() {
    std::unique_lock lock(mutex_);
    value_ = 0;
  }

 private:
  mutable std::shared_mutex mutex_;
  unsigned int value_ = 0;
};

int main() {
  ThreadSafeCounter counter;

  auto increment_and_print = [&counter]() {
    for (int i = 0; i < 3; i++) {
      std::cout << std::this_thread::get_id() << "-" << counter.increment() << std::endl;
    }
  };

  std::thread thread1(increment_and_print);
  std::thread thread2(increment_and_print);

  thread1.join();
  thread2.join();
}

输出：

 

2. 测试用例

 

 

 

2）测试用例