在Linux系统上用出c++设计五个哲学家进餐问题
时间: 2024-02-24 16:56:23 浏览: 87
好的,我可以为您提供一个简单的解决方案。
首先,需要使用线程来实现五个哲学家的进餐问题。每个哲学家可以视为一个线程,餐具可以视为共享资源。
下面是一个基本的C++代码框架,可以实现五个哲学家的进餐问题:
```c++
#include <iostream>
#include <thread>
#include <mutex>
#include <chrono>
using namespace std;
const int NUM_PHILOSOPHERS = 5;
mutex forks[NUM_PHILOSOPHERS];
void philosopher(int id) {
int left_fork = id;
int right_fork = (id + 1) % NUM_PHILOSOPHERS;
while (true) {
// philosopher is thinking
cout << "Philosopher " << id << " is thinking." << endl;
this_thread::sleep_for(chrono::milliseconds(500));
// philosopher is hungry and tries to pick up forks
cout << "Philosopher " << id << " is hungry and tries to pick up forks." << endl;
forks[left_fork].lock();
forks[right_fork].lock();
// philosopher is eating
cout << "Philosopher " << id << " is eating." << endl;
this_thread::sleep_for(chrono::milliseconds(1000));
// philosopher is done eating and puts down forks
cout << "Philosopher " << id << " is done eating and puts down forks." << endl;
forks[left_fork].unlock();
forks[right_fork].unlock();
}
}
int main() {
thread philosophers[NUM_PHILOSOPHERS];
// create threads for philosophers
for (int i = 0; i < NUM_PHILOSOPHERS; i++) {
philosophers[i] = thread(philosopher, i);
}
// join threads
for (int i = 0; i < NUM_PHILOSOPHERS; i++) {
philosophers[i].join();
}
return 0;
}
```
在这个例子中,我们使用了互斥锁mutex来保护共享资源(即餐具)。每个哲学家尝试获取左右两侧的餐具,如果两个餐具都被占用,他就会一直等待,直到两个餐具都可用为止。
这个例子只是一个基本的实现,可能会有死锁等问题。更高级的实现可能需要使用条件变量等机制来避免这些问题。
阅读全文