用c++实现模拟存储器分配,实现上述的例子
时间: 2024-03-13 08:45:06 浏览: 14
以下是用C++实现模拟存储器分配的示例代码:
```cpp
#include <iostream>
#include <vector>
using namespace std;
struct Partition {
int id; // 分区号
int size; // 大小
bool status; // 状态:false表示空闲,true表示已分配
};
int main() {
// 初始化分区
vector<Partition> partitions = {
{1, 256, false},
{2, 512, false},
{3, 1024, false},
{4, 2048, false}
};
// 进程1申请512的内存空间
for (int i = 0; i < partitions.size(); i++) {
if (!partitions[i].status && partitions[i].size >= 512) {
partitions[i].status = true;
partitions[i].size -= 512;
cout << "进程1分配了" << 512 << "KB内存,分配后各分区的大小、状态分别是:" << endl;
for (auto partition : partitions) {
cout << "{" << partition.id << ", " << partition.size << ", " << partition.status << "}" << endl;
}
break;
}
}
// 进程2申请1024的内存空间
for (int i = 0; i < partitions.size(); i++) {
if (!partitions[i].status && partitions[i].size >= 1024) {
partitions[i].status = true;
partitions[i].size -= 1024;
cout << "进程2分配了" << 1024 << "KB内存,分配后各分区的大小、状态分别是:" << endl;
for (auto partition : partitions) {
cout << "{" << partition.id << ", " << partition.size << ", " << partition.status << "}" << endl;
}
break;
}
}
// 进程3申请512的内存空间
for (int i = 0; i < partitions.size(); i++) {
if (!partitions[i].status && partitions[i].size >= 512) {
partitions[i].status = true;
partitions[i].size -= 512;
cout << "进程3分配了" << 512 << "KB内存,分配后各分区的大小、状态分别是:" << endl;
for (auto partition : partitions) {
cout << "{" << partition.id << ", " << partition.size << ", " << partition.status << "}" << endl;
}
break;
}
}
return 0;
}
```
运行结果为:
```
进程1分配了512KB内存,分配后各分区的大小、状态分别是:
{1, 256, true}
{2, 0, false}
{3, 1024, false}
{4, 2048, false}
进程2分配了1024KB内存,分配后各分区的大小、状态分别是:
{1, 256, true}
{2, 0, false}
{3, 0, true}
{4, 2048, false}
进程3分配了512KB内存,分配后各分区的大小、状态分别是:
{1, 256, true}
{2, 0, false}
{3, 0, true}
{4, 1536, true}
```