C++ has a variety of concurrent programming modes, including threads, mutexes, condition variables, atomic operations and asynchronous processing. Choosing the appropriate mode depends on application requirements such as synchronous data access, conditional waits, atomic operations, and improved responsiveness. By understanding pattern purpose and selection criteria, developers can build efficient and maintainable concurrent applications.
The use and selection of C++ concurrent programming modes
Concurrent programming is crucial in modern software development, and C++ provides a wealth of Concurrent programming model to meet the needs of different scenarios. This article explores the use and selection of these modes.
Concurrent programming mode
Mode Selection
Choosing the correct concurrency mode depends on the needs of your specific application:
Practical case
Mutex protects shared variables
// 定义互斥体 std::mutex m; // 使用锁保护临界区 std::lock_guard<std::mutex> lock(m); // 在临界区中对共享变量进行操作 ...
Conditional variables wait for resources to be available
// 定义条件变量 std::condition_variable cv; // 线程等待条件成立 std::unique_lock<std::mutex> lock(m); cv.wait(lock, []{ return resource_available; }); // 条件成立后继续执行任务 ...
Atomic operation update counter
// 原子计数器 std::atomic<int> counter; // 原子更新计数器 counter.fetch_add(1);
Asynchronous processing of file reading and writing
// 异步文件读写 std::async(std::launch::async, [](const std::string& filename) { // 在单独的线程中读取文件的内容 std::ifstream file(filename); std::string contents; std::getline(file, contents); ... }, "file.txt");
Conclusion
C++ provides various concurrent programming modes to meet different application needs. By understanding the purpose and selection criteria of different patterns, developers can efficiently build concurrent applications, improving performance and maintainability.
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