C++11 终止一个thread对象表示的线程
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2019-12-04 16:32:11
Categories：
Tags：
“terminate 1 thread + forcefully (target thread doesn’t cooperate) +
pure C++11 = No way”.
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对于Linux/GCC，可以用pthread.h里的pthread_cancel来强行杀死某一线程。
注意thread对象的析构函数并不会把线程杀死。
code:
#include <iostream>
#include <thread>
#include <chrono>
#include <pthread.h>
using namespace std;
void foo() {
size_t x = 0;
while (1) {
cout << ++x << endl;
this_thread::sleep_for(chrono::milliseconds(100));
}
}
int main() {
std::cerr << "1、先杀死再join\n";
{
thread t(foo);
this_thread::sleep_for(chrono::seconds(1));
cout << "t.joinable() = " << t.joinable() << endl;
pthread_cancel(t.native_handle());
cout << "after cancelling, t.joinable() = " << t.joinable() << endl;
t.join();
}
cout << "The thread is destructed\n\n";
this_thread::sleep_for(chrono::seconds(1));
std::cerr << "2、先detach再杀死\n";
{
thread t(foo);
pthread_t id = t.native_handle();
t.detach();
cout << "detached\n";
this_thread::sleep_for(chrono::seconds(1));
cout << "t.joinable() = " << t.joinable() << endl;
pthread_cancel(id);
}
cout << "The thread is destructed\n\n";
this_thread::sleep_for(chrono::seconds(1));
std::cerr << "3、thread对象的析构函数不会杀死线程\n";
{
thread t(foo);
t.detach();
this_thread::sleep_for(chrono::seconds(1));
}
this_thread::sleep_for(chrono::seconds(1));
return 0;
}
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output:
1、先杀死再join
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t.joinable() = 1
after cancelling, t.joinable() = 1
The thread is destructed
2、先detach再杀死
detached
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t.joinable() = 0
The thread is destructed
3、thread对象的析构函数不会杀死线程
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- 一个thread对象在析构前必须要detach或者join，不然会报错：
terminate called without an active exception
所以如果没有detach，cancel完了要join一下。
而且自然销毁前必须detach。
- detach之后native_handle返回的值就不对了，所以要在detach之前把这个值保存起来。
来源：<www.bo-yang.net/2017/11/19/cpp-kill-detached-thread>