How to create thread in C++?

Creating threads can improve program performance and responsiveness. In C++, create a thread using the std::thread(function_name, argument_list) syntax, where function_name is the function to be run and argument_list are the arguments to be passed. For example, create a thread to print "Hello, World!": #include #include using namespace std;void printMessage() { cout

How to create a thread in C++

Threads are lightweight execution units that can run simultaneously with other threads. Each thread has its own independent instruction pointer, stack and local variables. Creating threads improves your program's performance and responsiveness by increasing concurrency and maximizing CPU utilization.

Syntax for creating threads

In C++, we can use the following syntax to create threads:

std::thread thread_name(function_name, argument_list);

Among them, thread_name is the name of the thread object, function_name is the function to be run, and argument_list is the argument list to be passed to the function.

Practical case: Create and run a thread

The following is a practical case of creating a new thread and making it print "Hello, World!":

#include <iostream>
#include <thread>

using namespace std;

void printMessage() {
  cout << "Hello, World!" << endl;
}

int main() {
  // 创建一个新线程
  thread thread1(printMessage);

  // 让主线程等待子线程完成
  thread1.join();

  return 0;
}

In this case, the printMessage function is a simple function to be executed by the new thread. thread1.join() statement will block the main thread until the child thread completes execution.

Things to note

• Thread creation requires operating system support.
• Threads share the same address space, so you need to pay attention to synchronization when accessing shared resources.
• When a thread terminates, its stack and local variables will be released.
• Threads can communicate with the main thread by passing parameters and return types.

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