C++多线程

• #include <thread>：C++多线程库

• #include <mutex>：C++互斥量库

• #include <future>：C++异步库

多线程介绍

线程的创建

void entry_1() { }以普通函数作为线程入口函数：void entry_2(int val) { }​std::thread my_thread_1(entry_1);std::thread my_thread_2(entry_2, 5);

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以类对象作为线程入口函数：

class Entry{
   void operator()() { } void entry_function() { }};​Entry entry;// 调用operator()()std::thread my_thread_1(entry); // 调用Entry::entry_functionstd::thread my_thread_2(&Entry::entry_function, &entry); 

以lambda表达式作为线程入口函数：

​// 运行结果​

std::thread my_thread([]() -> void  {
   // ...  }); // 举例#include <iostream>#include <thread>#include <mutex>#include <future>#include <string>#include <limits>​using namespace std;​int main() {
    // 获取 size_t 类型的最小值 constexpr size_t min_size_t = std::numeric_limits<size_t>::min(); std::cout << "min_size_t = " << min_size_t << std::endl; // 获取 size_t 类型的最大值 constexpr size_t max_size_t = std::numeric_limits<size_t>::max(); std::cout << "max_size_t = " << max_size_t << std::endl; // 开启子线程1 std::thread thread1([]()->void {
   for (size_t i = 0; i < 2; i++) {
   for (size_t i = 0; i < 2; i++) {
   std::cout << "hardware_concurrency1 = " << std::thread::hardware_concurrency() << std::endl; } } });  // 开启子线程2 std::thread thread2([]()->void {
   std::cout << std::endl; for (size_t i = 0; i < 2; i++) {
   for (size_t i = 0; i < 2; i++) {