设计一个分段存储管理系统代码的流程图
时间: 2023-11-18 07:24:02 浏览: 36
很抱歉,作为一个语言模型AI,我无法提供流程图,但我可以为您提供一个简单的分段存储管理系统代码的示例,希望对您有所帮助:
```
#include <stdio.h>
struct Segment {
int start_address;
int end_address;
};
struct Memory {
int size;
Segment segments[100];
};
void init_memory(Memory *memory, int size) {
memory->size = size;
memory->segments[0].start_address = 0;
memory->segments[0].end_address = size - 1;
}
void allocate_memory(Memory *memory, int process_size) {
for (int i = 0; i < 100; i++) {
if (memory->segments[i].start_address == -1) {
break;
}
int segment_size = memory->segments[i].end_address - memory->segments[i].start_address + 1;
if (segment_size >= process_size) {
int new_start_address = memory->segments[i].start_address;
int new_end_address = new_start_address + process_size - 1;
memory->segments[i].start_address = new_end_address + 1;
if (memory->segments[i].start_address > memory->segments[i].end_address) {
for (int j = i; j < 99; j++) {
memory->segments[j] = memory->segments[j + 1];
}
memory->segments[99].start_address = -1;
memory->segments[99].end_address = -1;
}
printf("Allocated memory for process of size %d: %d-%d\n", process_size, new_start_address, new_end_address);
return;
}
}
printf("Cannot allocate memory for process of size %d\n", process_size);
}
void free_memory(Memory *memory, int start_address) {
for (int i = 0; i < 100; i++) {
if (memory->segments[i].start_address == -1) {
break;
}
if (memory->segments[i].start_address == start_address) {
printf("Freed memory at %d-%d\n", memory->segments[i].start_address, memory->segments[i].end_address);
memory->segments[i].start_address = -1;
memory->segments[i].end_address = -1;
for (int j = i; j < 99; j++) {
memory->segments[j] = memory->segments[j + 1];
}
memory->segments[99].start_address = -1;
memory->segments[99].end_address = -1;
return;
}
}
printf("Cannot free memory at %d\n", start_address);
}
int main() {
Memory memory;
init_memory(&memory, 1000);
allocate_memory(&memory, 300);
allocate_memory(&memory, 200);
allocate_memory(&memory, 400);
free_memory(&memory, 0);
allocate_memory(&memory, 500);
return 0;
}
```
这段代码实现了一个简单的分段存储管理系统,可以初始化一块指定大小的内存空间,并在其中为进程分配连续的空间。每个内存段都由起始地址和结束地址组成,如果有一个内存段大小大于等于进程需要的大小,就将该内存段分配给进程。释放内存时,找到起始地址匹配的内存段并将其释放。
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