DragonOS-Community/DragonOS
4
1
Fork 0
mirror of https://github.com/DragonOS-Community/DragonOS.git synced 2025-06-18 12:16:31 +00:00
Code Issues Releases Wiki Activity

完成了malloc和free

Browse Source
This commit is contained in:
fslongjin
2022-05-11 11:33:29 +08:00
parent 8b8583cad9
commit c120a0e992
4 changed files with 37 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
user/libs/libc/malloc.c
View File

@ -57,10 +57,10 @@ static malloc_mem_chunk_t *malloc_query_free_chunk_bf(uint64_t size)
}
malloc_mem_chunk_t *ptr = malloc_free_list;
malloc_mem_chunk_t *best = NULL;
printf("query size=%d", size);
// printf("query size=%d", size);
while (ptr != NULL)
{
printf("ptr->length=%#010lx\n", ptr->length);
// printf("ptr->length=%#010lx\n", ptr->length);
if (ptr->length == size)
{
best = ptr;
@ -69,18 +69,14 @@ static malloc_mem_chunk_t *malloc_query_free_chunk_bf(uint64_t size)
if (ptr->length > size)
{
printf("676767\n");
if (best == NULL)
best = ptr;
else if (best->length > ptr->length)
best = ptr;
printf("6rdf\n");
}
printf("ptr->next=%#018lx\n", ptr->next);
ptr = ptr->next;
}
printf("return best=%#018lx\n", (uint64_t)best);
return best;
}
@ -275,7 +271,7 @@ void *malloc(ssize_t size)
}
found:;
printf("ck = %#018lx\n", (uint64_t)ck);
// printf("ck = %#018lx\n", (uint64_t)ck);
if (ck == NULL)
return (void *)-ENOMEM;
// 分配空闲块
@ -296,12 +292,12 @@ found:;
malloc_mem_chunk_t *new_ck = (malloc_mem_chunk_t *)(((uint64_t)ck) + size);
new_ck->length = ck->length - size;
new_ck->prev = new_ck->next = NULL;
printf("new_ck=%#018lx, new_ck->length=%#010lx\n", (uint64_t)new_ck, new_ck->length);
// printf("new_ck=%#018lx, new_ck->length=%#010lx\n", (uint64_t)new_ck, new_ck->length);
ck->length = size;
malloc_insert_free_list(new_ck);
}
printf("ck=%lld\n", (uint64_t)ck);
// printf("ck=%lld\n", (uint64_t)ck);
// 此时链表结点的指针的空间被分配出去
return (void *)((uint64_t)ck + sizeof(uint64_t));
}
@ -313,4 +309,8 @@ found:;
*/
void free(void *ptr)
{
// 找到结点（此时prev和next都处于未初始化的状态）
malloc_mem_chunk_t * ck = (malloc_mem_chunk_t *)((uint64_t)ptr-sizeof(uint64_t));
// printf("free(): addr = %#018lx\t len=%#018lx\n", (uint64_t)ck, ck->length);
malloc_insert_free_list(ck);
}