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73 lines (68 loc) · 1.56 KB
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//
// Created by william on 2021/7/17.
//
#include "base.h"
#include "commonMacro.h"
namespace threadTest
{
/// 此demo用于解决在多线程下，因为悬垂指针导致的崩溃问题
class ThreadTestCheck
{
public:
~ThreadTestCheck()
{
std::weak_ptr<int> isLife = m_checkIsLife;
m_checkIsLife = nullptr;
int n = 0;
while (!isLife.expired())
{
std::this_thread::sleep_for(std::chrono::milliseconds(1));
if (++n > 1000)
{
break;
}
}
}
std::shared_ptr<int>& isLive() { return m_checkIsLife; }
private:
std::shared_ptr<int> m_checkIsLife = std::make_shared<int>();
};
struct ThreadTest : public ThreadTestCheck
{
// operator=, returns a reference to this
~ThreadTest()
{
std::cout << "~ThreadTest called" << std::endl;
}
std::string& str()
{
return m_str;
}
void setStr(std::string s)
{
m_str = std::move(s);
}
private:
std::string m_str = "null";
};
void threadTest()
{
auto* test = new ThreadTest();
auto str = test->str();
LOG_INFO("%s", str.c_str());
delete test;
std::weak_ptr<int> isLivePtr = std::weak_ptr<int>(test->isLive());
auto isLive = isLivePtr.lock();
if (isLive)
{
LOG_INFO("is live");
}
else
{
LOG_ERROR("is not live");
}
/// 此时，test是一个悬垂指针，使用这个指针可能会崩溃也可能不会崩溃
test->setStr("after");
LOG_ERROR(test->str().c_str());
}
} // namespace threadTest