C++ Tutor

Examples

C++ Concurrent App

Building a Concurrent App

C++ concurrent app uses std::thread for parallelism.

Introduction to C++ Concurrent Programming

Concurrency in C++ is a powerful feature that enables the execution of multiple sequences of operations simultaneously. This is particularly useful for improving the performance of applications by utilizing multi-core processor capabilities. In this tutorial, we will explore how to implement concurrency in C++ using the std::thread class from the C++ Standard Library.

Understanding std::thread

The std::thread class represents a single thread of execution in C++. It allows you to create and manage threads, enabling concurrent execution of functions or callable objects. Here, we will discuss how to create and manage threads using std::thread.

Basic Example of std::thread

Let's begin with a simple example to understand how std::thread works. We'll create a thread that executes a function to print a message.

In this example, we define a function printMessage that outputs a message to the console. We then create a std::thread object t that runs this function. The t.join() call ensures that the main thread waits for the t thread to finish execution before proceeding, ensuring proper synchronization.

Using Lambda Functions with std::thread

Besides regular functions, you can also use lambda functions with std::thread. This is useful for defining small pieces of executable code inline without having to create separate functions.

In the example above, a lambda function is passed directly to the std::thread constructor. This allows for more concise and readable code, especially when the thread's task is simple.

Managing Multiple Threads

To harness the full power of concurrency, you may need to manage multiple threads. The following example demonstrates how to manage multiple threads that perform different tasks simultaneously.

In this example, we define two functions, taskA and taskB, which are executed concurrently by two separate threads. Both threads are joined using join() to ensure that the main program waits for their completion before exiting.

Conclusion

C++ concurrency with std::thread provides a straightforward way to leverage parallelism in your applications. By creating and managing threads, you can significantly enhance the performance of CPU-bound tasks. However, it's crucial to manage thread synchronization appropriately to avoid common pitfalls such as race conditions and deadlocks.

Examples

Next
API Testing