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1. 死锁

#include <mutex>

using namespace std;

class Dummy {};

void swap(Dummy& lhs,Dummy& rhs);

class A
{
private:
	Dummy myObj;
	std::mutex mu;
public:
	A(Dummy const& obj):myObj(obj){}
	friend void swap(A& lhs, A& rhs)
	{
		// the arguments are checked to ensure they are different instances, 
		// because attempting to acquire a lock on a std::mutex 
		// when we already hold it is undefined behavior. 
		if(&lhs==&rhs) return;

		// the call to std::lock() locks the two mutexes
		std::lock(lhs.mu,rhs.mu);

		// two std::lock_guard instances are constructed one for each mutex.
		std::lock_guard<std::mutex> lock_a(lhs.mu,std::adopt_lock);
		std::lock_guard<std::mutex> lock_b(rhs.mu,std::adopt_lock);

		swap(lhs.myObj, rhs.myObj);
	}
};

2. 避免死锁

C++11线程指南(七)--死锁,布布扣,bubuko.com

C++11线程指南(七)--死锁

标签：使用   io   数据   for   ar   问题   代码   amp   

原文地址：http://blog.csdn.net/shltsh/article/details/38457337