C++中标准线程库的基本使用介绍

#include <iostream>
#include <future>
 
//线程对应的函数
bool thread_func(int x) {
	return true;
}
int main()
{
	int inputNum = 65547;
	std::future<bool> future = std::async(thread_func, inputNum);
	bool ret = future.get();
	getchar();
}

#include <iostream>
#include <thread>
#include <mutex>
std::mutex mtx; 
 
int count=0;
 
void print_block(int n) {
	mtx.lock();
   count++;
	//do somethings
	mtx.unlock();
}
int main()
{
	std::thread thread1(print_block, 50);
	std::thread thread2(print_block, 50);
 
	thread1.join();
	thread2.join();
	getchar();
	return 0;
}

#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
 
std::mutex mtx;
std::condition_variable cv;
 
void print_id(int id) {
	std::unique_lock<std::mutex> lck(mtx);
	cv.wait(lck);
	std::cout << "thread " << id << '\n';
}
void go() {
	std::unique_lock<std::mutex> lck(mtx);
	cv.notify_all();
}
int main()
{
	std::thread threads[10];
	for (int i = 0; i < 10; ++i)
		threads[i] = std::thread(print_id, i);
   std::cout << "start thread run" << std::endl;
	go();
	for (auto& th : threads){th.join();}
	getchar();
	return 0;
}

#include <iostream>
#include <future>
#include <chrono>
void Thread_Fun1(std::promise<int> &p)
{
	std::this_thread::sleep_for(std::chrono::seconds(5));
	int iVal = 233;
	std::cout << "传入数据(int)：" << iVal << std::endl;
	p.set_value(iVal);
}
 
void Thread_Fun2(std::future<int> &f)
{
	//阻塞函数，直到收到相关联的std::promise对象传入的数据
	auto iVal = f.get();
	std::cout << "收到数据(int)：" << iVal << std::endl;
}
 
int main()
{
	std::promise<int> pr1;
	std::future<int> fu1 = pr1.get_future();
 
	std::thread t1(Thread_Fun1, std::ref(pr1));
	std::thread t2(Thread_Fun2, std::ref(fu1));
 
	//阻塞至线程结束
	t1.join();
	t2.join();
	return 1;
}