互斥锁：数据共享_互斥锁如何识别共享数据-优快云博客

本文链接：https://blog.youkuaiyun.com/jlm7689235/article/details/115262590

这段代码展示了在C++中使用多线程和互斥锁实现数据输入和输出的同步。通过定义`MUTEX`宏，实现了对全局变量`mlDataShared`的保护，避免了数据竞争。类`DataProcess`封装了输入和输出操作，提供了更高级别的数据处理。程序创建了两个线程，一个用于输入数据，另一个用于输出数据，确保了数据的正确处理。

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代码程序

#include <iostream>
#include <mutex>
#include <list>
#include <thread>

using namespace std;


#define THREAD_BY_CLASS
//#define TRREAD_BY_FUNCTION
#define MUTEX

#ifdef MUTEX
std::mutex MyMutex;
#endif


std::list<int> mlDataShared;


void InputData(void)
{
	for (int i = 0, iend = 1000; i < iend; i++)
	{
#ifdef MUTEX
		MyMutex.lock();
#endif
		cout << "插入第" << i + 1 << "个数据 : " << i << endl;
		mlDataShared.push_back(i);
#ifdef MUTEX
		MyMutex.unlock();
#endif
	}
}
void OutputData(void)
{
	for (int i = 0, iend = 1000; i < iend; i++)
	{
#ifdef MUTEX
		MyMutex.lock();
#endif
		cout << "输出第" << i + 1 << "个数据: " << i << endl;
		mlDataShared.pop_front();
#ifdef MUTEX
		MyMutex.unlock();
#endif
	}
}


class DataProcess {
public:
	void InputData(void)
	{
		for (int i = 0, iend = 1000; i < iend; i++)
		{
#ifdef MUTEX
			MyMutex.lock();
#endif
			cout << "插入第" << i + 1 << "个数据 : " << i << endl;
			mlDataShared.push_back(i);
#ifdef MUTEX
			MyMutex.unlock();
#endif
		}
	}
	void OutputData(void)
	{
		while (1)
		{
			//for (int i = 0, iend = mlDataShared.size(); i < iend; i++)
			if (!mlDataShared.empty())
			{
#ifdef MUTEX
				MyMutex.lock();
#endif
				cout << "输出第" << iCount++ << "个数据: " << mlDataShared.front() << endl;
				mlDataShared.pop_front();
#ifdef MUTEX
				MyMutex.unlock();
#endif
			}
			else
			{
				iCount = 0;
			}
		}
	}
private:
#ifdef MUTEX
	std::mutex MyMutex;
#endif
	std::list<int> mlDataShared;
    int iCount;
};


int main(int argc, char** argv) {
#ifdef THREAD_BY_CLASS
	class DataProcess myclass;
	std::thread inputThread(&DataProcess::InputData, ref(myclass));
	std::thread outputThread(&DataProcess::OutputData, ref(myclass));
#endif

#ifdef TRREAD_BY_FUNCTION
	cout << "jlm" << endl;
	thread inputThread(InputData);
	thread outputThread(OutputData);
#endif
	inputThread.join();
	outputThread.join();

	std::cout << "Data Processed" << std::endl;
	return 0;
}