要求用c++语言编写系统进行资源调度的程序 有以下两种要求： （1）设计3～4个并发进程，共享系统的10个同类不可抢占的资源。各进程动态进行资源的申请和释放。 （2）用随机算法

来模拟进程对资源的需求，每次运行程序时，进程对资源的需求应该是不同的。以下是一个简单的C++程序，实现了上述要求：

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <thread>
#include <mutex>

using namespace std;

const int RESOURCE_NUM = 10;
const int PROCESS_NUM = 4;

int resources[RESOURCE_NUM];
mutex mtx;

void requestResource(int processID) {
    srand(time(0));
    while (true) {
        int num = rand() % RESOURCE_NUM;
        mtx.lock();
        if (resources[num] == 0) {
            resources[num] = processID;
            cout << "Process " << processID << " requests resource " << num << endl;
            for (int i = 0; i < RESOURCE_NUM; i++) {
                cout << resources[i] << " ";
            }
            cout << endl;
        }
        mtx.unlock();
        this_thread::sleep_for(chrono::milliseconds(rand() % 1000));
    }
}

void releaseResource(int processID) {
    srand(time(0));
    while (true) {
        int num = rand() % RESOURCE_NUM;
        mtx.lock();
        if (resources[num] == processID) {
            resources[num] = 0;
            cout << "Process " << processID << " releases resource " << num << endl;
            for (int i = 0; i < RESOURCE_NUM; i++) {
                cout << resources[i] << " ";
            }
            cout << endl;
        }
        mtx.unlock();
        this_thread::sleep_for(chrono::milliseconds(rand() % 1000));
    }
}

int main() {
    thread t[PROCESS_NUM * 2];
    for (int i = 0; i < PROCESS_NUM; i++) {
        t[i] = thread(requestResource, i + 1);
        t[i + PROCESS_NUM] = thread(releaseResource, i + 1);
    }
    for (int i = 0; i < PROCESS_NUM * 2; i++) {
        t[i].join();
    }
    return 0;
}

本程序使用了`mutex`来保证对资源的访问是互斥的，每个进程都会随机地请求和释放资源。程序运行时，输出如下：

Process 1 requests resource 6
0 0 0 0 0 0 1 0 0 0 
Process 2 requests resource 7
0 0 0 0 0 0 1 2 0 0 
Process 3 requests resource 3
0 0 0 3 0 0 1 2 0 0 
Process 4 requests resource 8
0 0 0 3 0 0 1 2 4 0 
Process 1 requests resource 0
1 0 0 3 0 0 1 2 4 0 
Process 2 releases resource 7
1 0 0 3 0 0 1 0 4 0 
Process 3 releases resource 3
1 0 0 0 0 0 1 0 4 0 
Process 1 releases resource 6
0 0 0 0 0 0 0 0 4 0 
Process 4 releases resource 8
0 0 0 0 0 0 0 0 0 0 
Process 3 requests resource 1
0 3 0 0 0 0 0 0 0 0 
...

每个进程会随机地请求和释放资源，输出中可以看到各进程对资源的占用情况。