C++模拟操作系统睡眠机制

news2024/9/22 17:36:47

在系统中定义一个变量bHiberable，如果是3分钟内休眠，那么每隔3分钟检测一次这个变量，如果为真，则进入睡眠，如果是假，就把这个标志设置为真。继续等待和检测。

程序阻止操作系统休眠的办法：操作系统系统对外提供API，程序每调用一次API，就将bHiberable标志设置为假，可以阻止系统的休眠。

为了避免和我一样的人的误解，这是我想出来的操作系统睡眠机制。真正阻止Windows系统睡眠使用到windows.h的SetThreadExecutionState 系统API，并且我不知道真正的windows系统的睡眠机制。
一个系统类实现睡眠功能

class System{
public:
	System(){
		iWaitTimeMS = 3000;
	}
	static void do_not_hibernate(){
		bHiberable = false;
	}
	void start(){
		thread t(&System::try_hibernate, this);
		t.detach();
	}
	void try_hibernate(){
		while(1){
			this_thread::sleep_for(std::chrono::milliseconds(iWaitTimeMS));
			cout<<"System：尝试睡眠：";
			if(bHiberable){
				cout<<"进入睡眠状态。"<<endl;
				break;
			}else{
				cout<<"不能睡眠。"<<endl;
				bHiberable = true;
			}
		}
	}

	static bool bHiberable;
private:
	int iWaitTimeMS;
};
bool System::bHiberable = true;

程序类会在运行期间阻止系统睡眠

class Program123{
public:
	void run(){
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
	}
};

完整代码

#include <iostream>
#include <thread>

using namespace std;

class System{
public:
	System(){
		iWaitTimeMS = 3000;
	}
	static void do_not_hibernate(){
		bHiberable = false;
	}
	void start(){
		thread t(&System::try_hibernate, this);
		t.detach();
	}
	void try_hibernate(){
		while(1){
			this_thread::sleep_for(std::chrono::milliseconds(iWaitTimeMS));
			cout<<"System：尝试睡眠：";
			if(bHiberable){
				cout<<"进入睡眠状态。"<<endl;
				break;
			}else{
				cout<<"不能睡眠。"<<endl;
				bHiberable = true;
			}
		}
	}

	static bool bHiberable;
private:
	int iWaitTimeMS;
};
bool System::bHiberable = true;
class Program123{
public:
	void run(){
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
		this_thread::sleep_for(std::chrono::milliseconds(2000));
		cout<<"Program：阻止系统睡眠。"<<endl;
		System::do_not_hibernate();
	}
};
int main(){
	System s;
	s.start();

	Program123 p123;
	p123.run();

	cin.get();
	return 0;
}