C++ STL <thread> 创建线程的三种方式

本文介绍如何使用C++ STL thread库进行多线程编程,包括通过函数指针、函数对象及成员函数创建线程的方法。示例代码展示了不同创建线程的方式及其在控制台输出的效果。

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使用 stl thread 编写多线程程序时,编译需要加 -pthread

通过函数指针创建线程

#include <iostream>
#include <thread>

using namespace std;

void func(int id, int number)
{
        for(int i=0;i<number;++i)
        {
                cout<<id<<":"<<i<<endl;
        }
}

int main()
{
    thread t1(func, 1, 50);
    thread t2(func, 2, 50);
    t1.join();
    t2.join();
}

通过函数对象创建线程

#include <iostream>
#include <thread>

using namespace std;

class Counter
{
public:
        Counter(int id, int number)
                :mId(id), mNumber(number)
        {}

        void operator()() const
        {
                for(int i=0;i<mNumber;++i)
                        {cout<<mId<<":"<<i<<endl;}
        }
private:
        int mId;
        int mNumber;
};

int main()
{
        // using uniform initialization syntax
        thread t1{Counter{1,20}};

        // using named variable
        Counter c(2,30);
        thread t2(c);

        // using temporary
        thread t3(Counter(3,10));

        t1.join();
        t2.join();
        t3.join();

        return 0;
}

通过成员函数创建对象

#include <iostream>
#include <thread>

using namespace std;

class Test
{
public:
        Test(int id, int number)
                :mId(id), mNumber(number)
        {}

        void func(string arg)
        {
                cout<<arg<<endl;
                for(int i=0;i<mNumber;++i)
                        {cout<<mId<<":"<<i<<endl;}
        }
private:
        int mId;
        int mNumber;
};

int main()
{
        Test test(1, 20);
        thread t{&Test::func, &test, "start"};
        t.join();

        return 0;
}
(gdb) bt #0 0x005cd5ff in std::_Rb_tree_decrement(std::_Rb_tree_node_base*) () from /usr/lib/libstdc++.so.6 #1 0x080e3b15 in std::_Rb_tree_iterator<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement> >::operator-- (this=0xbfbacdc4) at /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:199 #2 0x080e3873 in std::_Rb_tree<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement>, std::_Select1st<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement> > >::_M_insert_unique (this=0x89b53a0, __v=...) at /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:1179 #3 0x080e31df in std::_Rb_tree<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement>, std::_Select1st<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement> >, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement> > >::_M_insert_unique_ (this=0x89b53a0, __position=..., __v=...) at /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_tree.h:1217 #4 0x080e2ee7 in std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, STDTM::AlarmElement, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, STDTM::AlarmElement> > >::insert (this=0x89b53a0, __position=..., __x=...) at /usr/lib/gcc/i686-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_map.h:540
06-13
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